CN107192531A - Continous way transonic wind tunnel hydrojet nitrogen pull-down test operation method - Google Patents
Continous way transonic wind tunnel hydrojet nitrogen pull-down test operation method Download PDFInfo
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Abstract
The present invention proposes a kind of continous way transonic wind tunnel hydrojet nitrogen pull-down test operation method, including prepares, runs and terminate three phases work.Preparation prepares including liquid nitrogen, squeezes and pushes away gas preparation, and distribution platform prepares, and wind-tunnel preparation, TT＆C system prepares, and liquid nitrogen transfer pipeline prepares, storage tank supercharging and gas displacement in wind-tunnel in advance；Operation phase work includes wind-tunnel cleaning, air-flow cooling, parameter transition and steady parameter experiment；Ending phase includes stop recording data；Stop injecting liquid nitrogen into hole body；By gas extraction system to wind-tunnel pressure release；Compressor continues to operate under the operating mode of setting, and air-flow and wind tunnel body are heated to design temperature or out of service to compressor after normal temperature by the heat of compressor release.Using method of the invention, it is possible to the operation of the operation of hydrojet nitrogen cooling system and wind-tunnel is integrated, it is ensured that safely and effectively carry out hydrojet nitrogen pull-down test in continous way transonic wind tunnel.
Description
Technical field
The present invention relates to Wind Tunnel Technique field, specially a kind of continous way transonic wind tunnel hydrojet nitrogen pull-down test operation side
Method.
Background technology
Reynolds number is the important similar parameter of wind tunnel experiment simulated flight device practical flying ability.In theory,
Wind tunnel experiment is simulated real state of flight completely, wind tunnel experiment and the Reynolds number of practical flight is kept one
Cause.However, due to being limited by factors such as moulded dimension, wind-tunnel power-equipment, energy resource systems, current wind tunnel experiment Reynolds
Number is also difficult to reach actual flight Reynolds number.The difference of experiment Reynolds number and flight Reynolds number can cause experiment gained boundary layer
Turn to twist, separation point position, shock-wave spot, the aerodynamic characteristic such as intensity form notable difference with actual flight state, as a result make experiment number
According to engineering application value substantially reduce, in some cases even can not use.Therefore, high (change) Reynolds number wind-tunnel pair is developed
The development of China's Aviation Industry and science and techniques of defence has its own strategic significance and engineering application value.
Continous way transonic wind tunnel is the reverse-flow type high-speed air being continuously long-running driven by axial flow compressor
Dynamic experiment platform, its flow field quality and conventional efficient are far above conventional intermittent wind tunnel.But due to continuous high-speed wind-tunnel
Driven, limited by energy resource system by heavy-duty motor, its experimental section Reynolds number still has certain gap with practical flight Reynolds number,
The demand of fighter plane and large high-speed civil aircraft model experiment can not be met well.Reynolds number by fluid density, temperature, speed and
Moulded dimension determines that fluid velocity and moulded dimension are restricted not malleable by wind-tunnel inherent condition, and it is close that cooling can increase fluid
Degree, reduces viscosity, is that a kind of improve tests Reynolds number effective way.Therefore, in order to further widen the experiment of the wind-tunnel
Reynolds number range, for the design feature and operational mode of continuous high-speed wind-tunnel, is not changing experimental section size, fluid media (medium)
And in the case of pressure, by way of spraying liquid nitrogen, using the gasification endothermic effect of liquid nitrogen, continuous high-speed wind-tunnel can be achieved
Cooling operation so that reach improve experiment Reynolds number purpose.
NF-6 wind-tunnel are China's First continuous high-speed wind-tunnel, be also domestic currently the only one put into operation it is continuous
Formula high-speed wind tunnel.The overall performance of the wind-tunnel reaches domestically leading, international most advanced level.By coordinating hydrojet nitrogen cooling system,
The purpose for the experiment reynolds number range for expanding NF-6 wind-tunnel can be realized, by spraying into liquid nitrogen into wind-tunnel, stabilization can be realized
About -20 DEG C of lowest gas temperature of section.The cooling runtime newly configured needs supporting measurement and control system to maintain system
Run well and necessary parameter measurement, while the operating measurement control of cooling system also needs the TT＆C system phase with whole wind-tunnel
Fusion, with realize to wind-tunnel Mach number, stagnation pressure, stagnation temperature multi-parameter complex controll, it is ensured that Flow Field in Wind Tunnel performance.Accordingly, it would be desirable to
The complete detailed operation method that hydrojet nitrogen pull-down test is safely and effectively carried out in continous way transonic wind tunnel of design.
The content of the invention
The operation of hydrojet nitrogen cooling system must be integrated with the operation of wind-tunnel, therefore, the present invention proposes that one kind is continuous
Formula transonic wind tunnel hydrojet nitrogen pull-down test operation method, takes the principle of " first cooling, rear voltage stabilizing, then speed governing " to carry out, experiment
Process is divided into preparation, operation and terminates three phases.
The technical scheme is that：
A kind of continous way transonic wind tunnel hydrojet nitrogen pull-down test operation method, it is characterised in that：Including following step
Suddenly：
Step 1：Preparation：Including
Liquid nitrogen prepares：Order, transport and the dump of liquid nitrogen are completed in week age before the test；
Squeeze and push away gas preparation：Complete to squeeze in three days before the test and push away gas preparation, by liquid nitrogen pump, vaporizer to gas cylinder group
Supercharging；
Distribution platform prepares：Distribution platform is used to open and close to operate for follow-up pneumatic operated valve to provide driving force；Adjust the manual of distribution platform
Valve and pressure-reducing valve, Shi Ge roads pressure-reducing valve output pressure value reach scope set in advance；
Wind-tunnel prepares：Complete every preparation of wind-tunnel normal temperature operation；And the residual water in heat exchanger tube is emptied, drop
Cooler does not work during temperature operation；
TT＆C system prepares：TT＆C system is opened, is monitored when being put into effect to cooling runtime parameter and sets up safety interlocking,
Realize that the keying that liquid nitrogen supply pneumatic operated valve is performed between master control, distribution platform quick valve open and close operation；
Liquid nitrogen transfer pipeline prepares：Liquid nitrogen transfer pipeline is cleaned before liquid nitrogen transfer pipeline is full of liquid nitrogen, and
Assigned temperature is pre-chilled to, liquid nitrogen then is filled to it again；
Storage tank is pressurized in advance：Open supercharging bypass to be pressurized liquid nitrogen storage tank in advance, until pressure of storage tank reaches that predetermined value is
Only；
Gas displacement in wind-tunnel：The dry gas in storage tank is pressed to enter line replacement to the gas in wind-tunnel in utilization, until hole
Untill the drought index of interior gas reaches predetermined dew-point temperature；
Step 2：Operation phase works：Including
Wind-tunnel is cleaned：Open compressor and operated under the operating mode of setting, liquid is sprayed into set flow by atomizer
Nitrogen, by original air in the gas displacement wind-tunnel after the liquid nitrogen vaporization of penetrating, is monitored to wind-tunnel interior air-flow aridity,
Stop cleaning after air-flow dew-point temperature reaches -39 DEG C；
Air-flow cools：Compressor is operated under the operating mode of setting, with mode set in advance, parameter and flow into wind-tunnel
Liquid nitrogen is sprayed into, gas flow temperature is reduced to design temperature；Mode, parameter and the flow of the setting refer to according to construction of wind tunnel meter
Calculate, it is ensured that hydrojet nitrogen mode, parameter and flow under construction of wind tunnel safety；
Parameter transition：Control system is by adjusting liquid nitrogen nozzle keying, compressor rotary speed and drain tap, by the work of wind-tunnel
Make parameter from the parameter of temperature-fall period to setup parameter transition；The parameter includes stagnation pressure and Mach number；
Steady parameter experiment：Control system carries out multivariable Control to wind-tunnel Mach number, stagnation temperature, stagnation pressure parameter, makes parameter steady
It is scheduled in the precision specified, and reaches predetermined test period, completes module tester；
Step 3：Ending phase：Including
Stop recording data；Stop injecting liquid nitrogen into hole body；By gas extraction system to wind-tunnel pressure release；Compressor continues
Operated under the operating mode of setting, air-flow and wind tunnel body are heated to design temperature or compressed to after normal temperature by the heat of compressor release
Machine is out of service；Wind-tunnel carries out end operation.
Beneficial effect
Using method of the invention, it is possible to which the operation of the operation of hydrojet nitrogen cooling system and wind-tunnel is integrated, really
Guarantor safely and effectively carries out hydrojet nitrogen pull-down test in continous way transonic wind tunnel.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become from description of the accompanying drawings below to embodiment is combined
Substantially and be readily appreciated that, wherein：
Fig. 1：Cool runtime theory of constitution figure；
Fig. 2：Preparatory stage flow chart；
Fig. 3：Operation phase flow chart；
Fig. 4：Ending phase flow chart；
Fig. 5：Hydrojet nitrogen pull-down test process；
Fig. 6：Pull-down test stagnation temperature changes；
Fig. 7：Pull-down test Ma numbers change；
Fig. 8：Pull-down test stagnation pressure changes.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and be not considered as limiting the invention.
A kind of continous way transonic wind tunnel hydrojet nitrogen pull-down test operation method described in the present embodiment, including prepare, transport
Row and end three phases.
1. the preparatory stage
The stage refers to a series of preparations for needing to carry out before wind tunnel compressor starts, and the step-by-step test flow is shown in Fig. 2,
Specifically include：
1) liquid nitrogen prepares：Order, transport and the dump of liquid nitrogen are completed about in week age before the test (because liquid nitrogen container has
Certain evaporation capacity, the resting period is long, then liquid nitrogen can be caused to waste)；
2) squeeze and push away gas preparation：Complete to squeeze in three days before the test and push away gas preparation, by liquid nitrogen pump, vaporizer to gas cylinder
Group supercharging；
3) distribution platform prepares：Distribution platform is mainly that follow-up pneumatic operated valve opens and closes operation offer driving force, adjusts the hand of distribution platform
Dynamic valve and pressure-reducing valve, Shi Ge roads pressure-reducing valve output pressure value reach scope set in advance；
4) wind-tunnel prepares：Complete every preparation of the normal temperature operation of wind-tunnel；In addition, must also empty in heat exchanger tube
Residual water, cooling operation when cooler do not work；
5) TT＆C system prepares：TT＆C system is opened, monitors when being put into effect to the parameter of the runtime that cools and sets up safety
Interlocking, realizes the operations such as the keying that liquid nitrogen supply pneumatic operated valve is performed between master control, the keying of distribution platform quick valve；
6) liquid nitrogen transfer pipeline prepares：Because liquid nitrogen conveying main line is longer, in order to ensure liquid nitrogen conveying is reliable and stable,
Pipeline needs to clean liquid nitrogen runner and is pre-chilled to assigned temperature before being full of liquid nitrogen, then fills liquid nitrogen to it again.This stage
Liquid nitrogen storage tank is in relatively low pressure state (0.2~0.3MPa), and the pressure usually relies on being provided from pressure charging system for storage tank
And maintenance.It is specific as follows：
A, cleaning：The meaning of cleaning is to displace original humid air in pipeline, prevents condensation vapor, this stage
Residual gas do not enter wind-tunnel, air is directly discharged into by pipe special.During concrete operations, less liquid nitrogen supply pneumatic operated valve is opened
(such as DN25 pneumatic operated valves), in the case where holding runner interior air-flow temperature is less low with less nitrogen flow (leaning on liquid nitrogen vaporization)
Humid air in pipeline is displaced.
B, precooling：It is an important step for ensureing its normal, trouble free service that precooling is carried out to liquid nitrogen transfer pipeline, specifically
Less liquid nitrogen supply pneumatic operated valve (such as DN40 pneumatic operated valves) can be opened during operation (repeatedly) to hold pipeline with less liquid nitrogen flow
Continuous cooling, until monitoring point temperature reaches stopping after predetermined value in pipeline.Need to be monitored the pressure in pipeline during precooling
And the safety interlocking of metering-in control system, it is ensured that not superpressure.
C, filling：Liquid nitrogen is filled to liquid nitrogen transfer pipeline, is another the important preparation link for ensureing its normal work；Pipe
The precooling process of road filling process and pipeline can be combined and carried out.Less liquid nitrogen supply gas can be opened during concrete operations (repeatedly)
Dynamic valve (such as DN40 pneumatic operated valves) is filled with less liquid nitrogen flow to pipeline, untill highest points out liquid in pipeline.
7) storage tank is pressurized in advance：(between master control) opens supercharging bypass and liquid nitrogen storage tank is pressurized in advance, until pressure of storage tank
Untill reaching predetermined value；
8) gas displacement in wind-tunnel：The dry gas in storage tank is pressed to enter line replacement to the gas in wind-tunnel in utilization, until
Untill the drought index of gas reaches predetermined dew-point temperature in hole.
2. the operation phase
Including wind-tunnel cleaning, air-flow cooling, status transition and steady parameter experiment, the experiment process of operation phase is shown in Fig. 3.
1) wind-tunnel is cleaned：Open compressor and (less stator blade angle, relatively low rotating speed) is operated under relatively low operating mode, pass through
Atomizer sprays into liquid nitrogen with less flow, right with original air in the gas displacement wind-tunnel after the liquid nitrogen vaporization of penetrating
Wind-tunnel interior air-flow aridity is monitored, and stops cleaning after air-flow dew-point temperature reaches -39 DEG C；
2) air-flow cools：Compressor is operated in relatively low operating mode, is sprayed with mode set in advance, parameter and flow into wind-tunnel
Enter liquid nitrogen, gas flow temperature is reduced to design temperature；Mode set in advance, parameter and flow realize rate of temperature fall requirement, drop
Warm speed is to be calculated to obtain according to construction of wind tunnel, premised on ensuring construction of wind tunnel safety；
3) parameter transition：Control system is by adjusting liquid nitrogen nozzle keying, compressor rotary speed and drain tap by wind-tunnel
Running parameter is from the low parameter (stagnation pressure and Mach number) of temperature-fall period to setup parameter transition；
4) steady parameter experiment：Control system carries out multivariable to parameters such as wind-tunnel Mach number, stagnation temperature, stagnation pressures and accurately controlled,
Ensure these parameter stabilities in specified precision, and reach predetermined test period, complete module tester.
3. ending phase
Set test procedure is completed, i.e., into ending phase, the step-by-step test flow chart is shown in Fig. 4, mainly includes：
1) stop recording data；
2) stop injecting liquid nitrogen into hole body；
3) by gas extraction system to wind-tunnel pressure release；
4) compressor continues slow-speed of revolution operating, and air-flow and wind tunnel body are heated to design temperature by the heat of compressor release
Or compressor is out of service after normal temperature；
5) each system of wind-tunnel and cooling runtime carry out remaining end operation.
By above-mentioned steps, by taking M=0.8 pressure charging temperature reduction experiment as an example, Fig. 5 gives the mistake of its whole pull-down test
Journey, Fig. 6 gives the situation of change of its stable section stagnation temperature, and Fig. 7 gives the situation of change of its test section Ma numbers, and Fig. 8 gives
The situation of change of its stable section stagnation pressure, as can be known from Figure, in this experiment：
1) average value of 9 stagnation temperature measuring points of stable section reaches -20 DEG C, and meets
2) average value of test section Ma numbers reaches 0.8, and Mach number deviation is | Δ Ma |≤0.003, that is, and meet σMa≤
0.003；
3) average value of stable section stagnation pressure reaches 1.7bar, and its amplitude of variation is met
4) effective time of wind-tunnel cooling operation is more than 90s.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art is not departing from the principle and objective of the present invention
In the case of above-described embodiment can be changed within the scope of the invention, change, replace and modification.
Claims (1)
1. a kind of continous way transonic wind tunnel hydrojet nitrogen pull-down test operation method, it is characterised in that：Comprise the following steps：
Step 1：Preparation：Including
Liquid nitrogen prepares：Order, transport and the dump of liquid nitrogen are completed in week age before the test；
Squeeze and push away gas preparation：Complete to squeeze in three days before the test and push away gas preparation, gas cylinder group is increased by liquid nitrogen pump, vaporizer
Pressure；
Distribution platform prepares：Distribution platform is used to open and close to operate for follow-up pneumatic operated valve to provide driving force；Adjust distribution platform hand-operated valve and
Pressure-reducing valve, Shi Ge roads pressure-reducing valve output pressure value reaches scope set in advance；
Wind-tunnel prepares：Complete every preparation of wind-tunnel normal temperature operation；And empty the residual water in heat exchanger tube, cooling fortune
Cooler does not work during row；
TT＆C system prepares：TT＆C system is opened, is monitored when being put into effect to cooling runtime parameter and sets up safety interlocking, realized
The keying of liquid nitrogen supply pneumatic operated valve, distribution platform quick valve are performed between master control and opens and closes operation；
Liquid nitrogen transfer pipeline prepares：Liquid nitrogen transfer pipeline is cleaned before liquid nitrogen transfer pipeline is full of liquid nitrogen, and precooling
To assigned temperature, liquid nitrogen then is filled to it again；
Storage tank is pressurized in advance：Open supercharging bypass to be pressurized liquid nitrogen storage tank in advance, untill pressure of storage tank reaches predetermined value；
Gas displacement in wind-tunnel：The dry gas in storage tank is pressed to enter line replacement to the gas in wind-tunnel in utilization, until gas in hole
Untill the drought index of body reaches predetermined dew-point temperature；
Step 2：Operation phase works：Including
Wind-tunnel is cleaned：Open compressor and operated under the operating mode of setting, liquid nitrogen is sprayed into set flow by atomizer, led to
Original air in the gas displacement wind-tunnel after the liquid nitrogen vaporization sprayed into is crossed, wind-tunnel interior air-flow aridity is monitored, works as gas
Stream dew-point temperature, which reaches, stops cleaning after -39 DEG C；
Air-flow cools：Compressor is operated under the operating mode of setting, is sprayed into mode set in advance, parameter and flow into wind-tunnel
Liquid nitrogen, design temperature is reduced to by gas flow temperature；Mode, parameter and the flow of the setting refer to be calculated according to construction of wind tunnel, really
Hydrojet nitrogen mode, parameter and the flow protected under construction of wind tunnel safety；
Parameter transition：Control system is joined the work of wind-tunnel by adjusting liquid nitrogen nozzle keying, compressor rotary speed and drain tap
Number is from the parameter of temperature-fall period to setup parameter transition；The parameter includes stagnation pressure and Mach number；
Steady parameter experiment：Control system carries out multivariable Control to wind-tunnel Mach number, stagnation temperature, stagnation pressure parameter, parameter stability is existed
In the precision specified, and predetermined test period is reached, complete module tester；
Step 3：Ending phase：Including
Stop recording data；Stop injecting liquid nitrogen into hole body；By gas extraction system to wind-tunnel pressure release；Compressor continues in setting
Operating mode under operate, air-flow and wind tunnel body are heated to design temperature or stopped to compressor after normal temperature by the heat of compressor release
Only run；Wind-tunnel carries out end operation.
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| CN108106746A (en) * | 2017-12-06 | 2018-06-01 | 西北工业大学 | The temperature survey of continuous wind tunnel cooling system and data collecting system |
| CN108151998A (en) * | 2017-12-06 | 2018-06-12 | 西北工业大学 | A kind of continuous wind tunnel cooling system safety interlocking method |
| CN113375892A (en) * | 2021-08-12 | 2021-09-10 | 中国空气动力研究与发展中心高速空气动力研究所 | Wind tunnel test system and test method based on reverse Brayton cycle of turboexpander |
| CN113375893A (en) * | 2021-08-12 | 2021-09-10 | 中国空气动力研究与发展中心高速空气动力研究所 | Continuous wind tunnel system adopting reverse Brayton cycle to control temperature and test method |
| CN115808284A (en) * | 2023-02-09 | 2023-03-17 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Wind tunnel multi-working condition modeling method based on neural network parameter scheduling |
| CN116105963A (en) * | 2023-04-12 | 2023-05-12 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Automatic blowing test method and system for large low-temperature wind tunnel |
| CN116213364A (en) * | 2023-05-11 | 2023-06-06 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Automatic wet gas cleaning method and system for large low-temperature wind tunnel |
| CN116297678A (en) * | 2023-05-23 | 2023-06-23 | 中国空气动力研究与发展中心高速空气动力研究所 | Average dew point measurement method of continuous wind tunnel based on drying system |
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| CN108106746A (en) * | 2017-12-06 | 2018-06-01 | 西北工业大学 | The temperature survey of continuous wind tunnel cooling system and data collecting system |
| CN108151998A (en) * | 2017-12-06 | 2018-06-12 | 西北工业大学 | A kind of continuous wind tunnel cooling system safety interlocking method |
| CN108106746B (en) * | 2017-12-06 | 2019-08-13 | 西北工业大学 | The temperature of continuous wind tunnel cooling system measures and data collection system |
| CN108151998B (en) * | 2017-12-06 | 2019-10-18 | 西北工业大学 | A kind of continuous wind tunnel cooling system safety interlocking method |
| CN113375892B (en) * | 2021-08-12 | 2022-06-21 | 中国空气动力研究与发展中心高速空气动力研究所 | Wind tunnel test method based on reverse Brayton cycle of turboexpander |
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| CN113375892A (en) * | 2021-08-12 | 2021-09-10 | 中国空气动力研究与发展中心高速空气动力研究所 | Wind tunnel test system and test method based on reverse Brayton cycle of turboexpander |
| CN115808284A (en) * | 2023-02-09 | 2023-03-17 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Wind tunnel multi-working condition modeling method based on neural network parameter scheduling |
| CN116105963A (en) * | 2023-04-12 | 2023-05-12 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Automatic blowing test method and system for large low-temperature wind tunnel |
| CN116213364A (en) * | 2023-05-11 | 2023-06-06 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Automatic wet gas cleaning method and system for large low-temperature wind tunnel |
| CN116213364B (en) * | 2023-05-11 | 2023-07-21 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Automatic wet gas cleaning method and system for large low-temperature wind tunnel |
| CN116297678A (en) * | 2023-05-23 | 2023-06-23 | 中国空气动力研究与发展中心高速空气动力研究所 | Average dew point measurement method of continuous wind tunnel based on drying system |
| CN116297678B (en) * | 2023-05-23 | 2023-08-11 | 中国空气动力研究与发展中心高速空气动力研究所 | Average dew point measurement method of continuous wind tunnel based on drying system |
| CN116483141A (en) * | 2023-06-20 | 2023-07-25 | 中国航空工业集团公司沈阳空气动力研究所 | Total temperature control system for continuous transonic wind tunnel and control method thereof |
| CN116483141B (en) * | 2023-06-20 | 2023-08-29 | 中国航空工业集团公司沈阳空气动力研究所 | Total temperature control system for continuous transonic wind tunnel and control method thereof |
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