CN102213638B - Closed-cycle wind tunnel system with inner and outer cavities - Google Patents
Closed-cycle wind tunnel system with inner and outer cavities Download PDFInfo
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- CN102213638B CN102213638B CN 201010142621 CN201010142621A CN102213638B CN 102213638 B CN102213638 B CN 102213638B CN 201010142621 CN201010142621 CN 201010142621 CN 201010142621 A CN201010142621 A CN 201010142621A CN 102213638 B CN102213638 B CN 102213638B
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- exocoel
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Abstract
The invention relates to a closed-cycle wind tunnel system with inner and outer cavities, which comprises a closed airflow cyclic system and a power system, wherein the closed airflow cyclic system comprises an inner cavity and an outer cavity encircling the inner cavity; both ends of the outer cavity are communicated with the inner cavity; and the power system is used for providing power, so that air is circulated in the closed airflow cyclic system.
Description
When submitting the present patent application to, the applicant has also submitted the utility model application corresponding with the present patent application to.
Technical field
The present invention relates to the wind-tunnel for movement entertainment, relate in particular to the wind tunnel system of the closed cycle with interior exocoel.
Background technology
Wind-tunnel is the experimental facilities that can manually produce and control air-flow, is used for the research and development of aerodynamics aspect.Vertical wind tunnel can produce air-flow vertically upward, is mainly used in aircraft research and development, parachute jumping simulated training.Since the last century the nineties, rise along with extreme sport, the parachute jumping simulated training begins to be evolved into a kind of novel sports and amusement campaign: utilize the air balance human bady gravitational of the vertical direction of vertical wind tunnel generation to reach the purpose of circling in the air, realize the flight of human body freedom of the air, utilize modern high technology to bring the experience of air limit motion to ordinary populace.Therefore the vertical wind tunnel that is used for sports and amusement is called again recreation wind tunnel.Enter 21st century, this sports and amusement campaign is risen rapidly in worldwide, and the recreation wind tunnel project of investment construction also increases sharply.
Traditional wind-tunnel adopts the mode of the large bout circulation of air-flow to realize.Behind the product or engineering of having investigated relevant recreation wind tunnel manufacturer, we find existing recreation wind tunnel ubiquity problem: cost of investment is high, and exceedance is ten million yuan basically; Long construction period needs more than 12 months basically.Therefore, development of new, economical, the demand that recreation wind tunnel rapidly becomes market is installed.
Summary of the invention
For above-mentioned problems of the prior art, an object of the present invention is to provide the less wind tunnel system of a kind of total floor area.
Another object of the present invention provides a kind of wind tunnel system with Novel power system.
A further object of the present invention provides a kind of wind tunnel system that can Fast Installation.
A further object of the present invention provides a kind of wind tunnel system with a plurality of flight capsules.
For realizing purpose of the present invention, according to one aspect of the present invention, provide a kind of wind tunnel system of closed cycle, comprising: the enclosed airflow circulating system, it comprises inner chamber and surrounds the exocoel of inner chamber that wherein exocoel is at its two ends and intracavity inter-connection; Power system is used for providing power, and gas is circulated in the enclosed airflow circulating system.
The wind tunnel system of above-mentioned closed cycle can be the vertical wind tunnel system, and inner chamber is air-flow rising flow regimes, and exocoel is the air descend flow regimes.
The wind tunnel system of above-mentioned closed cycle, its power system can comprise a plurality of power sub-system, each power sub-system can be arranged on diverse location in the exocoel according to the power needs.
The wind tunnel system of above-mentioned closed cycle, at least one in its power sub-system can be arranged on the middle part of exocoel, and in the power sub-system at least one can be arranged on an end of exocoel.
The wind tunnel system of above-mentioned closed cycle, its inner chamber can comprise at least one contraction rectification section and at least one flight capsule.
The wind tunnel system of above-mentioned closed cycle, its exocoel can be provided with inlet valve or air intake window, is used for by the gas density in the supercharging mode increase airflow circulating system.
The wind tunnel system of above-mentioned closed cycle can be provided with the first air-returning device at the one end, and the air-flow of guiding inner chamber changes exocoel over to, and can be provided with the second air-returning device at its other end, and the air-flow of guiding exocoel changes inner chamber over to.
The wind tunnel system of above-mentioned closed cycle, its inner chamber can be that circle or polygonal internal chamber wall limit by xsect, and its exocoel can be that circle or polygonal outer chamber wall limit by internal chamber wall and xsect.
The wind tunnel system of above-mentioned closed cycle, the ratio of the area of section of its exocoel and the area of section of inner chamber is preferably greater than 2.
The wind tunnel system of above-mentioned closed cycle, its enclosed airflow circulating system can comprise: agent structure, this agent structure can be the framed structures of tubular, are spliced by many quarter butts, perhaps are spliced by at least one stock and Duo Gen quarter butt.Wherein, the inboard of the framed structure of tubular can be used for covering internal chamber wall, and the outside can be used for covering outer chamber wall.
The wind tunnel system of above-mentioned closed cycle, its agent structure can comprise along the periphery of the xsect of this agent structure and repeating or along a plurality of cellular constructions of vertical repetition of this agent structure.
The wind tunnel system of above-mentioned closed cycle, wherein each cellular construction can be that xsect is trapezoidal, fan ring, rectangle, hexagon or other polygonal column structure.
The wind tunnel system of above-mentioned closed cycle, wherein each cellular construction can be to be trapezoidal vertical column by the xsect that 12 quarter butts are spliced.
The wind tunnel system of above-mentioned closed cycle can also comprise: airtight passage, and its communication with cavity wall and outer chamber wall, the confession people enters the flight capsule the inner chamber outside wind tunnel system; Gas-tight door is arranged on the junction of airtight passage and outer chamber wall and internal chamber wall.
The wind tunnel system of above-mentioned closed cycle, wherein airtight passage can be fixed in the cellular construction.
Description of drawings
Fig. 1 is the front elevational schematic according to the enclosed airflow circulating system of one embodiment of the invention;
Fig. 2 is the schematic top plan view according to the enclosed airflow circulating system of the embodiment of the invention;
Fig. 3 is the arrangement synoptic diagram according to the power sub-system of one embodiment of the invention;
Fig. 4 is the synoptic diagram according to the basic building block, combined member, cellular construction and the agent structure that are used for structure enclosed airflow circulating system of one embodiment of the invention;
Fig. 5 is the structural representation according to the wind-tunnel with multiple flight capsule of one embodiment of the invention; And
Fig. 6 is the structural representation according to the airtight passage of interior exocoel of one embodiment of the invention.
Embodiment
Be further described below in conjunction with the implementation of accompanying drawing to recreation wind tunnel provided by the present invention.In institute's drawings attached, represent same or analogous parts with same or analogous label.
Fig. 1 is the front elevational schematic according to the enclosed airflow circulating system of one embodiment of the invention.In this embodiment, the enclosed airflow circulating system of wind-tunnel of the present invention comprises the inner chamber 1 and exocoel 2 that closely links to each other, and wherein exocoel 2 surrounds inner chamber 1 and is connected with exocoel at its two ends, forms the air-flow mobile structure capable of circulation of an enclosed.Under the air-flow of power system promoted, the inner chamber 1 of native system was the gas rising flow regimes on relative ground, the gas Doenward flow district that its exocoel 2 is relative ground.Air-flow upwards flows to exocoel 2 through the upper return air section apparatus 4 of system along inner chamber 1, reenters inner chamber 1 through the lower return air section apparatus 5 of system downwards along exocoel 2 again, thereby the closed cycle that forms air-flow flows.
Fig. 2 shows the schematic top plan view according to the enclosed airflow circulating system of the embodiment of the invention.In an embodiment of the present invention, the structure in inside and outside chamber is that inside and outside chamber wall by one group of nested concentric structure limits: as shown in Figure 2, inner circle is internal chamber wall, and its inside is inner chamber 1; Cylindrical is outer chamber wall, and the part between inner circle and the cylindrical is exocoel 2.In another embodiment of the present invention, inside and outside chamber wall has adopted polygonized structure.Certainly, those skilled in the art should understand that, in the present invention, the xsect of the inside and outside chamber of wind-tunnel wall can adopt various shapes, circle, the polygon in the accompanying drawing 2 for example, and can adopt concentric structure or non-concentric structure, perhaps adopt identical shaped combination or difform combination, for example the combination of round cavity wall and polygon outer chamber wall.The present invention is unrestricted on the one hand at this.In better enforcement, inside and outside chamber wall can adopt concentric structure, also can adopt concentric regular polygon, such as positive 8,10,12 limit shapes, can greatly reduce cost in selection with installing like this, also can provide pacing items for modular design.In addition, according to aerodynamic calculating, the ratio of the cross-sectional area of exocoel and the cross-sectional area of inner chamber is preferably greater than 2.Completely different with the mode of the large bout circulation of traditional wind-tunnel, construction of wind tunnel of the present invention is very compact, can effectively save the floor area of wind-tunnel, for the business promotion of recreation wind tunnel brings great benefit.
The propulsion system of wind-tunnel are extremely important in the status of wind tunnel system, are directly connected to building cost, operational efficiency and the operation expense of wind-tunnel.Traditional wind-tunnel adopts single heavy-duty motor mostly, and power is built peace cost height basically greater than 1000KW, and operation costs are large, and commercial running is difficulty relatively, and this also is the one of the main reasons of restriction recreation wind tunnel marketing.Wind-tunnel of the present invention adopts a plurality of power sub-system, is about to the required power general power of wind-tunnel and is decomposed into a plurality of low power power sub-system.In an embodiment of the present invention, power sub-system is integral type, the modular power subsystem that comprises power plant module, can be made of motor and aero propulsion device.In one embodiment, adopt a plurality of high efficiency motors of 70 to 120KW, be equipped with efficient aero propulsion device, form the modular power subsystem 3 of a plurality of integral types.The profile physical dimension of these power sub-system 3 can be controlled within the 2*2*2 rice.As shown in Figure 3, can be according to the wind speed requirement of wind-tunnel inner chamber, also can be according to the quantity of the Location of requirement required drive subsystem 3 of power and function, and these power sub-system 3 can be arranged on any position in the wind-tunnel exocoel 2 of the present invention, for example can be placed in middle part or the bottom of exocoel 2.Preferably, power system of the present invention can comprise 6-12 power sub-system that is dispersed in the exocoel.If power sub-system 3 is arranged on the middle part of wind-tunnel exocoel of the present invention, the perpendicular direction that power advances air-flow down; If power sub-system 3 is arranged on the bottom of wind-tunnel exocoel of the present invention, power advances the parallel ground of direction and the inner chamber that leads of air-flow.The power system flexible design of this wind-tunnel freely, can solve fully because the factors such as noise or the support structure problem that design brings to wind-tunnel: the electric system of existing wind-tunnel adopts a heavy-duty motor mostly, and be placed in the top of wind-tunnel, and the weight of heavy-duty motor is mostly above several tons even tens tons, this supporting construction to wind-tunnel requires higher, the present invention is decomposed into a plurality of low power motors with powerful motor, so that the one-piece construction of wind-tunnel is evenly distributed is stable; Simultaneously, power sub-system of the present invention is in the exocoel 2 of wind-tunnel fully, the noise that the tunnel airstream motion produces is blocked in the cyclic space of inner chamber 1 and exocoel 2 fully, so that the environmental noise of wind-tunnel outside reduces greatly, to compare the environmental friendliness degree much higher with more American-European open recreation wind tunnels for this.In one embodiment, we have made the wind-tunnel that general power reaches 900KW, adopt the power sub-system of 10 groups of 90KW to be placed on the bottom of exocoel, about 4 meters of intracavity diameter.
In an embodiment of the present invention, can adopt the agent structure of analogous crystalline structure, to realize unique construction of wind tunnel.The agent structure of analogous crystalline structure is rendered as the framed structure of tubular on the whole, comprising the cellular construction of a plurality of similar crystal units.Preferably, cellular construction can repeat along the periphery of cylindrical body structure xsect, perhaps can be along vertical repetition of cylindrical body structure.The crystal unit structure can be rendered as various structures, for example column structure, tetrahedral structure etc.In addition, in the embodiment that adopts the cylinder cellular construction, each cellular construction can have various shape of cross sections, such as trapezoidal, fan ring, rectangle, hexagon or other polygon etc.
In an embodiment of the present invention, the agent structure of analogous crystalline structure can be combined by a plurality of basic building blocks, for example can be spliced by many quarter butts, perhaps can be spliced by stock and the quarter butt of right quantity.In splicing, the basic building block direct splicing can be become the framework of agent structure; Perhaps, can first basic building block be combined into cellular construction, then adopt the similar mode that plays with building blocks that a plurality of cellular constructions are spliced into agent structure.
Fig. 4 is the synoptic diagram according to the basic building block 10, combined member 12, cellular construction 14 and the agent structure 16 that are used for structure enclosed airflow circulating structure of one embodiment of the invention.In embodiment as shown in Figure 4, adopt quarter butt as basic building block 10.In an embodiment of the present invention, can adopt basic building block 10 direct splicing to become agent structure 16.For example, adopt three quarter butts 10 to be spliced into combined member 12, proceed splicing and can form cellular construction 14.Then, can along the periphery of agent structure xsect and along agent structure vertically, on the basis of cellular construction 14 with quarter butt 10 extensions splice, obtain comprising the agent structure 16 of a plurality of cellular constructions 14.In another embodiment of the present invention, can be spliced into cellular construction 14 with basic building block 10 first, then adopt the similar mode that plays with building blocks that the cellular construction 14 of a plurality of independent formation is spliced into agent structure 16.For example, adopt three quarter butts 10 to be spliced into combined member 12, continuation is spliced combined member 12 can form cellular construction 14.Repeat this process and can obtain a plurality of cellular constructions 14, then can along the periphery of agent structure xsect and along agent structure vertically, adopts the similar mode that plays with building blocks in addition stacking with formation agent structure 16 to independent a plurality of cellular constructions that form 14.Can adopt fixing etc. the variety of way of welding, nut to the splicing of basic building block 10, combined member 12, cellular construction 14.Basic building block 10 (being quarter butt in the present embodiment) can be made by materials such as metal or FRP.As shown in Figure 4, combined member 12 can be made of three quarter butts 10, and each cellular construction 14 is comprised of 4 combined members 12 (i.e. 12 quarter butts).In an embodiment of the present invention, the vertical quarter butt of combined member 12 is perpendicular to other two horizontal quarter butts, and cellular construction 14 is that xsect is trapezoidal vertical column structure.In another embodiment of the present invention, cellular construction 14 can be that xsect is the column structure of fan ring, is formed by 8 straight quarter butts and 4 arc quarter butts.Such cellular construction is spliced, can obtain agent structure cylindraceous.In preferred embodiment of the present invention, the physical dimension length and width height of each combined member can be controlled in 2 meters.
In another embodiment of the present invention, agent structure 16 can constituting by stock and quarter butt.For example, adopt many stocks to form the vertical long limit of agent structure 16 as shown in Figure 4, then form the minor face of this agent structure 16 with quarter butt, thereby be spliced into agent structure 16.
In an embodiment of the present invention, miscellaneous part in the wind-tunnel except agent structure all can be embedded in the cellular construction 14, can be by prefabricated embedded part or bolted to cellular construction 14 such as power sub-system 3, upper return air section apparatus 4, lower return air section apparatus 5 etc.In an embodiment of the present invention, in the inboard of agent structure 16, coated with surfacing such as glass, PC plate or other sheet material, form the internal chamber wall of wind-tunnel, thereby limit inner chamber 1; Similarly, the outside of agent structure 16 forms the outer chamber wall of wind-tunnel coated with surfacing such as glass, PC plate or other sheet material, just becomes the exocoel 2 of wind-tunnel between the interior outside of agent structure.
Blocking Design of Main Structure of the present invention can resolve into whole system many basic building blocks, and such design is beneficial to makes and Fast Installation in batches, and this also is important value place of the present invention.
The inner chamber part of wind-tunnel of the present invention can be according to the wind-tunnel design requirement, arrange and shrink rectification section, flight capsule (namely, the movement entertainment section) etc. active section also can repeat to arrange a plurality of active sections, and for example native system can provide two or more flight capsules.The contraction rectification section refers to the from lower to upper inwardly contraction of the inner chamber 1 of this part, connects fairing at the minimum of contraction place.Such as accompanying drawing 5, in one embodiment, we in the inner chamber of wind-tunnel from lower to upper (relatively ground) four zones such as lower contraction rectification section 61, lower flight capsule 71, upper contraction rectification section 62, upper flight capsule 72 are set.In upper compression rectification section zone 61 and lower contraction rectification section zone 62, internal chamber wall upwards shrinks separately by a certain percentage.Preferably, shrink the wind-guiding section the whole story xsect diameter proportion greater than about 1.2, concrete shrinkage rates can require to use Aerodynamic Method try to achieve according to the wind speed of inner chamber.The contraction rectification section of inner chamber preferably will keep streamlined to reduce air-flow at a high speed by the turbulization phenomenon.Fairing can adopt the cowling panel of conventional honeycomb fashion, and the thickness of cowling panel is preferably about 60-150 centimetre, and material can be selected metal or FRP barrier.The diameter proportion of the xsect of flight capsule is preferably less than 0.8 up and down.Certainly, if power system is abundant, can design the wind-tunnel system with three or above flight capsule.Because wind-tunnel of the present invention under the supply of same power system, can provide two or above flight capsule, for commercial operation provides larger profit margin.
In one embodiment, the present invention's cavity segment outside wind-tunnel is provided with inlet valve or window, by supercharging mode so that the gas density in the native system increase.
In one embodiment, wind-tunnel of the present invention also is provided with airtight passage 8, and the people can pass exocoel 2 by airtight passage and enter flight capsule in the inner chamber 1.As shown in Figure 6, airtight passage 8 connects outer chamber wall and internal chamber wall, and the width of passage is between 60-100 centimetre, and height is between 180-200 centimetre.Airtight passage 8 respectively arranges gas-tight door in the junction of outer chamber wall and internal chamber wall, shuts this two fans gas-tight door, and whole passage is confined space.In order to reduce the resistance of 8 pairs of exocoel high velocity airs of airtight passage, the two sections of airtight passage 8 can be designed to circular arc, so that whole airtight passage is capsule shape, and be embedded in the exocoel 2 of wind-tunnel.For example, this airtight passage can be embedded in the cellular construction 14.
Although more than described preferred embodiment of the present invention, the present invention is not limited only to this.Those of ordinary skill in the art can carry out various variations and change on basis described above.
Do not break away from the various changes of spirit of the present invention and change and all should drop within protection scope of the present invention.Protection scope of the present invention is limited by accompanying claims.
Claims (15)
1. the wind tunnel system of a closed cycle is characterized in that, described wind tunnel system comprises:
The enclosed airflow circulating system, it comprises inner chamber and surrounds the exocoel of described inner chamber, wherein said exocoel is at its two ends and described intracavity inter-connection, and described inner chamber is limited by the internal chamber wall of tubular, and described exocoel is limited by described internal chamber wall and the tubular outer chamber wall of surrounding described internal chamber wall;
Power system is used for providing power, and gas is circulated in described enclosed airflow circulating system.
2. wind tunnel system as claimed in claim 1 is characterized in that, described wind tunnel system is the vertical wind tunnel system, and described inner chamber is air-flow rising flow regimes, and described exocoel is the air descend flow regimes.
3. wind tunnel system as claimed in claim 1 or 2 is characterized in that, described power system comprises a plurality of power sub-system, and each power sub-system is arranged on diverse location in the described exocoel according to the power needs.
4. wind tunnel system as claimed in claim 3 is characterized in that, at least one in the described power sub-system is arranged on the middle part of described exocoel, and in the described power sub-system at least one is arranged on an end of described exocoel.
5. wind tunnel system as claimed in claim 1 or 2 is characterized in that, described inner chamber comprises at least one contraction rectification section and at least one flight capsule.
6. wind tunnel system as claimed in claim 1 or 2 is characterized in that, described exocoel is provided with inlet valve or air intake window, is used for by the gas density in the supercharging mode increase airflow circulating system.
7. wind tunnel system as claimed in claim 1 or 2, end at described wind tunnel system is provided with the first air-returning device, guide the air-flow of described inner chamber to change described exocoel over to, and be provided with the second air-returning device at the other end of described wind tunnel system, guide the air-flow of described exocoel to change described inner chamber over to.
8. wind tunnel system as claimed in claim 1 is characterized in that, described inner chamber is circular by xsect or polygonal internal chamber wall limits, and described exocoel is circular by described internal chamber wall and xsect or polygonal outer chamber wall limits.
9. wind tunnel system as claimed in claim 1 is characterized in that, the ratio of the area of section of described exocoel and the area of section of described inner chamber is greater than 2.
10. wind tunnel system as claimed in claim 8 is characterized in that, described enclosed airflow circulating system comprises:
Agent structure, described agent structure are the framed structures of tubular, are spliced by many quarter butts, perhaps be spliced by at least one stock and Duo Gen quarter butt,
The inboard of the framed structure of wherein said tubular is used for covering internal chamber wall, and the outside is used for covering outer chamber wall.
11. wind tunnel system as claimed in claim 10 is characterized in that, described agent structure comprises along the periphery of the xsect of described agent structure and repeating or along a plurality of cellular constructions of vertical repetition of described agent structure.
12. wind tunnel system as claimed in claim 11 is characterized in that, each described cellular construction is that xsect is trapezoidal, fan ring, rectangle, hexagon or other polygonal column structure.
13. wind tunnel system as claimed in claim 11 is characterized in that, each described cellular construction is to be trapezoidal vertical column by the xsect that 12 quarter butts are spliced.
14. wind tunnel system is characterized in that as described in claim 11, also comprises:
Airtight passage, it is communicated with described internal chamber wall and described outer chamber wall, and the confession people enters the flight capsule the described inner chamber outside described wind tunnel system; With
Gas-tight door is arranged on the junction of described airtight passage and described outer chamber wall and described internal chamber wall.
15. wind tunnel system as claimed in claim 14 is characterized in that, described airtight passage is fixed in the described cellular construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010142621 CN102213638B (en) | 2010-04-09 | 2010-04-09 | Closed-cycle wind tunnel system with inner and outer cavities |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010142621 CN102213638B (en) | 2010-04-09 | 2010-04-09 | Closed-cycle wind tunnel system with inner and outer cavities |
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| Publication Number | Publication Date |
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| CN102213638A CN102213638A (en) | 2011-10-12 |
| CN102213638B true CN102213638B (en) | 2013-04-24 |
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| CN 201010142621 Expired - Fee Related CN102213638B (en) | 2010-04-09 | 2010-04-09 | Closed-cycle wind tunnel system with inner and outer cavities |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063402B (en) * | 2012-12-10 | 2015-05-27 | 中国飞机强度研究所 | Testing device used for simulating propeller airflow and line spectrum noise of turboprop aircraft |
| SE541001C2 (en) * | 2016-02-15 | 2019-02-26 | Inclined Labs AB | Wind tunnel for human flight |
| CN113188752B (en) * | 2021-06-11 | 2022-02-22 | 日照坤仑智能科技有限公司 | Unsteady vertical wind tunnel |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6083110A (en) * | 1998-09-23 | 2000-07-04 | Sky Venture, Inc. | Vertical wind tunnel training device |
| CA2574043A1 (en) * | 2004-07-30 | 2006-02-02 | Skyventure, Llc | Recirculating vertical wind tunnel skydiving simulator and reduced drag cable for use in wind tunnels and other locations |
| CN1851434A (en) * | 2006-06-06 | 2006-10-25 | 刘晓萌 | Power system lower vertical wind tunnel |
| CN101228070A (en) * | 2005-12-21 | 2008-07-23 | 沃拉尔赛公司 | Improved panoramic, vertical wind tunnel |
-
2010
- 2010-04-09 CN CN 201010142621 patent/CN102213638B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6083110A (en) * | 1998-09-23 | 2000-07-04 | Sky Venture, Inc. | Vertical wind tunnel training device |
| CA2574043A1 (en) * | 2004-07-30 | 2006-02-02 | Skyventure, Llc | Recirculating vertical wind tunnel skydiving simulator and reduced drag cable for use in wind tunnels and other locations |
| CN101228070A (en) * | 2005-12-21 | 2008-07-23 | 沃拉尔赛公司 | Improved panoramic, vertical wind tunnel |
| CN1851434A (en) * | 2006-06-06 | 2006-10-25 | 刘晓萌 | Power system lower vertical wind tunnel |
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