CN104458190A - Liquid air source energy-saving efficient wind tunnel device and method thereof - Google Patents
Liquid air source energy-saving efficient wind tunnel device and method thereof Download PDFInfo
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- CN104458190A CN104458190A CN201410740102.7A CN201410740102A CN104458190A CN 104458190 A CN104458190 A CN 104458190A CN 201410740102 A CN201410740102 A CN 201410740102A CN 104458190 A CN104458190 A CN 104458190A
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Abstract
The invention discloses a liquid air source energy-saving efficient wind tunnel device and a method of the wind tunnel device. A liquid air storage tank is connected with a high-pressure ultra-low-temperature pump which is connected with a gasification device through a high-pressure liquid air pipeline, the gasification device is connected with a high-pressure air chamber through a high-pressure air channel, an air intake cover is connected with the left end of the high-pressure air chamber, a throat channel is arranged in the high-pressure air chamber, an air gap is formed between the left end of the throat channel and the high-pressure air chamber, the throat channel is connected with the air intake cover through an air return pipe, and an exhaust pipe is arranged on the air return pipe and provided with an exhaust valve. According to the wind tunnel device, environmental heat is absorbed through liquid air, high-pressure air generated through expansion serves as driving air, large airflow is achieved on the basis of a fluid mechanics coanda effect principle, energy consumption is substantially reduced, using cost is reduced, and low-temperature environmental simulation and a wind tunnel experiment under a negative pressure condition can be achieved easily.
Description
Technical field
The present invention relates to Wind Tunnel Technique field, be specifically related to the efficient wind-tunnel devices and methods therefor of a kind of liquefied air gas source energy saving.
Background technology
Wind tunnel experiment is an indispensable ingredient in aircraft development work.It not only plays an important role in the research and development of aerospace engineering, along with the development of industrial aerodynamics, indispensable especially in fields such as communications and transportation, building construction, Wind Power Utilizations.This method, flox condition easily controls, and can important evidence be motion composition principle.During experiment, often model or material object are fixed on wind and obtain experimental data again, economically.
For making experimental result accurate, flowing during experiment must be similar to actual flow state, namely must meet the requirement of the law of similitude.But due to the restriction of tunnel size and power, it is very difficult for simulating all similar parameters in a wind-tunnel, and normally by the problem that will study, the parameter selecting some to have the greatest impact is simulated simultaneously.
In addition, the flow field quality of wind tunnel experiment section, as Velocity Profiles uniformity coefficient, the size of wind-tunnel axis is departed from mean air flow direction, pressure gradient, the uniformity coefficient of section temperature distribution, the turbulivity of air-flow and the noise level etc. along wind-tunnel axis direction must meet certain standard, and regularly carries out inspection mensuration.
Wind-tunnel primarily of hole body, drive system and Measurement and Control System composition, the formal cause type of wind tunnel of each several part and different.
Low-speed wind tunnel, it has an energy model to be carried out to the experimental section of necessary measurement and observation.Experimental section upstream is improved the even straight degree of air-flow, reduces the stable section of turbulivity and make air-flow accelerate to contraction section or the jet pipe of required flow rate.There is the reflux section reducing flow velocity, the diffuser reducing energy loss and the discharge section of being guided into by air-flow outside wind-tunnel or lead back to wind-tunnel entrance in experimental section downstream.Sometimes in order to reduce the noise inside and outside wind-tunnel, at stable section and exhausr port etc., sound suppressor is equipped with at place.
The drive system of wind-tunnel has two classes:
One class by controllable electric unit and by its drive fan or Axial Flow Compressor form.Fan rotates or compressor rotor rotates the flowing making stream pressure increase to maintain stable in pipeline.Change rotating speed or the blade angle of fan, or change the damping to air-flow, the speed of adjustable air-flow.Direct current motor can be powered by alterating and direct current unit or silicon controlled rectifier.Its duration of runs is long, and running expense is lower, how to use in low-speed wind tunnel.The wind-tunnel of this kind of drive system is used to claim continuous wind tunnel, but sharply strengthen along with gas velocity increases required driving power, such as produce transonic speed every square metre, air-flow experimental section area power demand and be about 4000 kilowatts, produce supersonic flow and be then about 16000 ~ 40000 kilowatts.
Another kind of is be stored in gas tank by supercharging air in advance with low power pneumatic plant, or with vacuum pump, the vacuum tank be connected with wind-tunnel outlet conduit is vacuumized, Quick open valve door during experiment, make pressure-air directly enter hole body by injector or by vacuum tank by air intake hole body, thus have air blowing, injection, air-breathing and their various forms of mutually combining.The wind-tunnel of this drive system is used to be called intermittent wind tunnel.Intermittent wind tunnel construction period is short, small investment, and general [[Reynolds number]] is higher, and its working time can be used for transonic speed by several seconds to tens seconds, supersonic and hypersonic wind-tunnel.The impulse wind tunnel that 1 second be less than for experimental period also by electro-arc heater or shock wave to improve the temperature of experimental gas, such consuming little energy, analog parameter is high.
And current existing wind tunnel test system energy consumption is large, use cost is high, do not allow the special status such as low temperature, negative pressure that is easy to do, need badly and want a kind of method and apparatus to solve this problem.
Summary of the invention
Because the above-mentioned defect of prior art, the invention provides the efficient wind-tunnel devices and methods therefor of liquefied air gas source energy saving, adopt liquefied air absorbing environmental heat, the gases at high pressure that expansion produces are as driving gas, the principle of fluid mechanics wall attachment effect is utilized to realize large air-flow, reduce energy consumption significantly, reduce use cost, easily realize the wind tunnel experiment under the simulation of low temperature environment and negative pressure condition.
For achieving the above object, the invention provides the efficient wind tunnel device of a kind of liquefied air gas source energy saving, comprise liquefied air storage tank, high-pressure ultra-low temperature pump, gasification installation, pressure-air room, muffler, gas outlet, vent valve, air gap, venturi, airscoop shroud, high-pressure gas circuit and high-pressure liquid air pipe line, liquefied air storage tank is connected with high-pressure ultra-low temperature pump, high-pressure ultra-low temperature pump is connected with gasification installation by high-pressure liquid air pipe line, gasification installation is connected with pressure-air room by high-pressure gas circuit, pressure-air room left end is connected with airscoop shroud, pressure-air indoor are provided with venturi, air gap is formed between venturi left end and pressure-air room, venturi is connected with airscoop shroud by muffler, muffler is provided with gas outlet, gas outlet is provided with vent valve.
The described left and right sides, pressure-air room is respectively positive pressure test section and negative pressure test section.
Utilize the efficient wind-tunnel method of the liquefied air gas source energy saving of said apparatus, its concrete steps are: the liquefied air or the nitrogen that are first stored ultralow temperature by liquefied air storage tank, gasification installation is squeezed into again by high-pressure ultra-low temperature pump, high-pressure liquid air is pressed into after the hot intensification gasification of absorbing environmental in gasification installation becomes gas, form gases at high pressure to spray from high-pressure gas circuit, and pass through the venturi of pressure-air room, after gases at high pressure produce wall attachment effect by air gap flowing, flow inside air gap, turn in venturi surface finally along arc, in flow process, gases at high pressure and ambient gas occur to spread and collision rift, gas is around driven to follow it to turn together, then suck from the left side, the right side sprays, form drive and the amplification of a gas.
Above-mentioned wall attachment effect refers to that fluid (current or air-flow) has and leaves original flow direction, changes the tendency along with the body surface flowing of protruding into.When there is mantle friction between fluid and its body surface of flowing through (being alternatively fluid viscosity), as long as curvature is little, fluid can flow along body surface.According to Newton third law, object grants the power of fluid one deflection, then fluid also must grant the power that one, object oppositely deflects.
The gases at high pressure of described positive pressure test section are also prepared by other equipment, save the energy consumption of existing equipment.
Described muffler can not use.
Can storing liquid air or liquid nitrogen in described liquefied air storage tank.
Gasification installation of the present invention can adopt air heat source, hydro-thermal source, electrical heating or fuel thermal source to provide gasification power source.
Beneficial effect of the present invention:
1, environment thermal energy is utilized, energy-saving and emission-reduction;
2, air-flow amplification efficiency is high;
3, high/low temperature, positive/negative-pressure experiment can be realized.
Be described further below with reference to the technique effect of accompanying drawing to design of the present invention, concrete structure and generation, to understand object of the present invention, characteristic sum effect fully.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
With reference to Fig. 1, this embodiment is by the following technical solutions: the efficient wind tunnel device of a kind of liquefied air gas source energy saving, comprise liquefied air storage tank 1, high-pressure ultra-low temperature pump 2, gasification installation 3, pressure-air room 4, positive pressure test section 5, negative pressure test section 6, muffler 7, gas outlet 8, vent valve 9, air gap 10, venturi 11, airscoop shroud 12, high-pressure gas circuit 13 and high-pressure liquid air pipe line 14, liquefied air storage tank 1 is connected with high-pressure ultra-low temperature pump 2, high-pressure ultra-low temperature pump 2 is connected with gasification installation 3 by high-pressure liquid air pipe line 14, gasification installation 3 is connected with pressure-air room 4 by high-pressure gas circuit 13, pressure-air room 4 left end is connected with airscoop shroud 12, venturi 11 is provided with in pressure-air room 4, air gap 10 is formed between venturi 11 left end and pressure-air room 4, venturi 11 is connected with airscoop shroud 12 by muffler 7, muffler 7 is provided with gas outlet 8, gas outlet 8 is provided with vent valve 9.
The described left and right sides, pressure-air room 4 is respectively positive pressure test section 5 and negative pressure test section 6.
Described liquefied air storage tank 1 is used to the liquefied air storing ultralow temperature, high-pressure ultra-low temperature pump 2 be the super-low liquid of low pressure is extracted out and boost become high pressure liquid after squeeze into gasification installation, the function of gasification installation 3 makes liquid gas heat absorption boiling expansion become gas, pressure-air room 4 is the cavitys storing gases at high pressure, be looped around venturi 11 outside, atmospheric pressure is more than or equal to during the pressure of positive pressure test section 5, negative pressure test section 6 is for being less than or equal to the test section of atmospheric air-flow during pressure, muffler 7 makes gas form a loop, gas outlet 8 is used for adjusting the pressure of channel interior, discharge the gas of the newly-increased energy being used for driving gases at high pressure, vent valve 9 in gas outlet 8 is used for controlling the size of air capacity, air gap 10: after gases at high pressure produce wall attachment effect by air gap flowing, flow inside air gap, turn in venturi 11 surface finally along arc, in flow process, gases at high pressure and ambient gas occur to spread and collision rift, gas is around driven to follow it to turn together, then suck from the left side, the right side sprays, form drive and the amplification of a gas, airscoop shroud 12 is the induction part of air amplifier, high-pressure gas circuit 13 is used to provide gases at high pressure, high-pressure gas pressure is 0.2-30MPa, high-pressure liquid air pipe line 14, high-pressure liquid air is pressed into after in gasification installation, intensification gasification becomes gas, forms gases at high pressure and sprays from high-pressure gas circuit 13 and use.
This embodiment utilizes fluid mechanics wall attachment effect principle to realize air flow, energy-saving and emission-reduction synergy; Positive/negative-pressure test can be implemented simultaneously; Owing to can pass into the air of low temperature, and air can decline further at venturi, thus can implement cryonetic wind tunnel test (temperature can lower than subzero 60 DEG C); Return line is raised the efficiency, and reduces steam, making ice, condensation; Liquefied air vaporescence absorbing environmental heat, significantly energy-conservation.
More than describe preferred embodiment of the present invention in detail.Should be appreciated that those of ordinary skill in the art just design according to the present invention can make many modifications and variations without the need to creative work.Therefore, all technician in the art, all should by the determined protection domain of claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (6)
1. the efficient wind tunnel device of liquefied air gas source energy saving, it is characterized in that, comprise liquefied air storage tank (1), high-pressure ultra-low temperature pump (2), gasification installation (3), pressure-air room (4), air gap (10), venturi (11), airscoop shroud (12), high-pressure gas circuit (13) and high-pressure liquid air pipe line (14), liquefied air storage tank (1) is connected with high-pressure ultra-low temperature pump (2), high-pressure ultra-low temperature pump (2) is connected with gasification installation (3) by high-pressure liquid air pipe line (14), gasification installation (3) is connected with pressure-air room (4) by high-pressure gas circuit (13), pressure-air room (4) left end is connected with airscoop shroud (12), venturi (11) is provided with in pressure-air room (4), air gap (10) is formed between venturi (11) left end and pressure-air room (4), venturi (11) is connected with airscoop shroud (12).
2. the efficient wind tunnel device of liquefied air gas source energy saving according to claim 1, is characterized in that, described pressure-air room (4) left and right sides is respectively positive pressure test section (5) and negative pressure test section (6).
3. the efficient wind tunnel device of liquefied air gas source energy saving according to claim 1, is characterized in that, the gases at high pressure of described positive pressure test section (5) are prepared by other equipment.
4. the efficient wind tunnel device of liquefied air gas source energy saving according to claim 1, it is characterized in that, the efficient wind tunnel device of described liquefied air gas source energy saving also comprises muffler (7), venturi 11 is connected with airscoop shroud (12) by muffler (7), muffler (7) is provided with gas outlet (8), gas outlet (8) is provided with vent valve (9).
5. the efficient wind tunnel device of liquefied air gas source energy saving according to claim 1, is characterized in that, can storing liquid air or liquid nitrogen in described liquefied air storage tank (1).
6. the efficient wind-tunnel method of the liquefied air gas source energy saving of the efficient wind tunnel device according to claim 1-5 any one, it is characterized in that, its concrete steps are: the liquefied air or the nitrogen that are first stored ultralow temperature by liquefied air storage tank, gasification installation is squeezed into again by high-pressure ultra-low temperature pump, high-pressure liquid air is pressed into after the hot intensification gasification of absorbing environmental in gasification installation becomes gas, form gases at high pressure to spray from high-pressure gas circuit, and pass through the venturi of pressure-air room, after gases at high pressure produce wall attachment effect by air gap flowing, flow inside air gap, turn in venturi surface finally along arc, in flow process, gases at high pressure and ambient gas occur to spread and collision rift, gas is around driven to follow it to turn together, then suck from the left side, the right side sprays, form drive and the amplification of a gas.
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Cited By (6)
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| CN105403378A (en) * | 2015-12-01 | 2016-03-16 | 苟仲武 | Method and apparatus for improving air storage type wind tunnel |
| CN107219056A (en) * | 2017-05-18 | 2017-09-29 | 西北工业大学 | Continuous high-speed wind-tunnel cooling system liquid nitrogen sprays into experimental section |
| CN110542532A (en) * | 2019-09-10 | 2019-12-06 | 中国空气动力研究与发展中心超高速空气动力研究所 | Wind tunnel helium gas reuse device |
| CN110887683A (en) * | 2019-12-09 | 2020-03-17 | 中国人民解放军国防科技大学 | Electrical heating type supersonic velocity ejector experiment system |
| CN112649173A (en) * | 2020-12-30 | 2021-04-13 | 哈尔滨工业大学 | Return flow type wind tunnel device for simulating low-pressure low-density dust storm environment of mars |
| CN113483985A (en) * | 2021-08-12 | 2021-10-08 | 中国空气动力研究与发展中心高速空气动力研究所 | Temporary-impulse wind tunnel system adopting reverse Brayton cycle to control temperature and test method |
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| CN110542532A (en) * | 2019-09-10 | 2019-12-06 | 中国空气动力研究与发展中心超高速空气动力研究所 | Wind tunnel helium gas reuse device |
| CN110887683A (en) * | 2019-12-09 | 2020-03-17 | 中国人民解放军国防科技大学 | Electrical heating type supersonic velocity ejector experiment system |
| CN112649173A (en) * | 2020-12-30 | 2021-04-13 | 哈尔滨工业大学 | Return flow type wind tunnel device for simulating low-pressure low-density dust storm environment of mars |
| CN112649173B (en) * | 2020-12-30 | 2023-08-11 | 哈尔滨工业大学 | Reflux type wind tunnel device for simulating Mars low-pressure low-density dust storm environment |
| CN113483985A (en) * | 2021-08-12 | 2021-10-08 | 中国空气动力研究与发展中心高速空气动力研究所 | Temporary-impulse wind tunnel system adopting reverse Brayton cycle to control temperature and test method |
| CN113483985B (en) * | 2021-08-12 | 2023-04-25 | 中国空气动力研究与发展中心高速空气动力研究所 | Temporary flushing type wind tunnel system adopting reverse brayton cycle to control temperature and test method |
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