A method for regulating the temperature of a wind tunnel airflow

Abstract

The application discloses a wind tunnel airflow temperature regulation method, and relates to the field of wind tunnel airflow temperature control. The method pumps a part of high-temperature cooling liquid flowing out of a liquid side of a heat exchanger to an inlet end of the liquid side of the heat exchanger, mixes the high-temperature cooling liquid with low-temperature cooling liquid sent by a liquid supply pipeline, and then flows into the heat exchanger. The remaining high-temperature cooling liquid is returned to a cooling system, cooled, and then pumped to the inlet end of the liquid side of the heat exchanger by the liquid supply pipeline. By changing the flow of a temperature regulation bypass, the flow ratio of cold and hot cooling liquid at the inlet end of the liquid side of the heat exchanger can be quickly adjusted, so that the temperature of the cooling liquid at the inlet end of the liquid side of the heat exchanger is regulated. The temperature regulation bypass is arranged beside the heat exchanger, eliminates the regulation delay caused by the cooling liquid conveying time between the cooling system and the heat exchanger, accelerates the change speed of the temperature of the cooling liquid at the inlet end of the liquid side of the heat exchanger, and thus the airflow temperature is quickly regulated.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wind tunnel airflow temperature control, in particular, to a wind tunnel airflow temperature regulation method. BACKGROUND

[0002] In a return flow wind tunnel, since the power system for driving the gas flow has large power, a cooling system is usually designed to take away the heat of the airflow in the wind tunnel through a heat exchanger to control the airflow temperature to the required range. For the wind tunnel that needs to consider the influence of the airflow temperature on the test, the airflow temperature of the test working condition also needs to be accurately controlled. The control of the airflow temperature can be realized by adjusting the cooling liquid flow and temperature supplied to the heat exchanger: the adjustment of the flow is usually realized by controlling the supply liquid pipeline pump, and the adjustment of the temperature is usually realized by controlling the heat dissipation of the cooling tower (for a closed system, it is to control the heat exchange of the plate heat exchanger). Since the change of the cooling liquid flow has small influence on the change of the heat exchange temperature difference of the heat exchanger, the adjustment effect is poor when the airflow temperature is adjusted by using this method; and for a large return flow wind tunnel, since the site is large and the system is multiple, the supply liquid pipeline between the cooling system and the heat exchanger is usually long, and the driving pump, the cooling tower, the plate heat exchanger and other devices are arranged in the cooling system field area together with other devices of the cooling system. The cooling liquid after the temperature adjustment of the cooling system needs a long time to reach the heat exchanger, so that the response time of the wind tunnel airflow temperature regulation is very long, and the temperature of the cooling water is affected by the long distance liquid supply pipe, which increases the difficulty of the temperature stable regulation. The conventional cooling system configuration method and temperature adjustment method cannot meet the demand of the wind tunnel test that needs to quickly and accurately control the airflow temperature, and a new airflow temperature regulation method needs to be developed on the basis of the basic cooling and heat exchange system configuration. SUMMARY

[0003] The purpose of the present application is to meet the demand of the wind tunnel test that needs to quickly and accurately control the airflow temperature.

[0004] In order to achieve the above-mentioned purpose of the application, the present application provides a wind tunnel airflow temperature regulation method, which is applied to a wind tunnel airflow temperature regulation system, the system comprises a temperature adjustment bypass arranged between a heat exchanger and a cooling system, the temperature adjustment bypass is used to divert a part of the cooling liquid flowing out from the liquid side outlet of the heat exchanger without being processed by the cooling system, and the diverted cooling liquid is mixed with the cooling liquid processed by the cooling system and then flows into the liquid side inlet of the heat exchanger, and the method comprises the following steps:

[0005] Step 1: set a test working condition, calculate a cooling liquid flow F0 based on the performance parameters of the heat exchanger, the airflow inlet parameters of the heat exchanger under the test working condition, the cooling liquid inlet parameters of the heat exchanger, and the target temperature of the airflow (i.e. the airflow outlet parameter), and take the cooling liquid flow F0 as the basic cooling liquid flow provided by the cooling system;

[0006] Step 2: set the cooling liquid flow rate Fb of the temperature regulating bypass, calculate the cooling liquid flow rate F1 flowing into the heat exchanger liquid side inlet based on the cooling liquid flow rate F0 and the cooling liquid flow rate Fb, and calculate the gas flow outlet temperature Tao of the heat exchanger gas side based on the cooling liquid temperature T2 of the heat exchanger liquid side outlet, the cooling liquid flow rate F0, the cooling liquid flow rate F1, the cooling liquid flow rate Fb, and the gas flow inlet temperature Tai at the heat exchanger gas flow inlet;

[0007] Step 3: adjust the test working condition to obtain the influence of the cooling liquid flow rate Fb on the gas flow outlet temperature Tao under different test working conditions, and obtain the temperature regulating initial parameters under different test working conditions;

[0008] Step 4: obtain the target working condition, obtain the corresponding temperature regulating initial parameters based on the target working condition, and based on the temperature regulating initial parameters, the cooling system provides the basic cooling liquid flow rate corresponding to the temperature regulating initial parameters, the temperature regulating bypass provides the cooling liquid flow rate corresponding to the temperature regulating initial parameters, and the gas flow outlet temperature Tao is coarsely adjusted to be close to the target temperature; then the cooling liquid flow rate of the temperature regulating bypass is adjusted, and the gas flow outlet temperature Tao is closed-loop adjusted to the target temperature;

[0009] In the application, a part of the high-temperature cooling liquid flowing out of the heat exchanger liquid side is pumped to the heat exchanger liquid side inlet end, mixed with the low-temperature cooling liquid sent by the liquid supply pipeline, and then flows into the heat exchanger; the remaining high-temperature cooling liquid is returned to the cooling system for cooling, and then pumped to the heat exchanger liquid side inlet end by the liquid supply pipeline. By changing the flow rate of the temperature regulating bypass, the flow rate ratio of the cold and hot cooling liquids at the heat exchanger liquid side inlet can be quickly adjusted, so that the temperature of the cooling liquid at the heat exchanger liquid side inlet can be adjusted; the temperature regulating bypass is arranged beside the heat exchanger, which eliminates the adjustment delay caused by the cooling liquid transportation time between the cooling system and the heat exchanger, and accelerates the change speed of the temperature of the cooling liquid at the heat exchanger liquid side inlet, so that the temperature of the gas flow can be quickly adjusted.

[0010] Preferably, the calculation method of the cooling liquid flow rate F0 is as follows:

[0011] ;

[0012] ;

[0013] wherein, is the heat transfer power of the gas flow to the cooling liquid when the heat exchanger is in a steady state, is the specific heat capacity of the gas at constant pressure, is the gas flow rate, is the specific heat capacity of the cooling liquid at constant pressure, is the heat exchange coefficient of the heat exchanger, is the heat exchange area of the heat exchanger, is the heat transfer temperature difference of the heat exchanger, and T1 is the cooling liquid temperature at the heat exchanger liquid side inlet.

[0014] Preferably, the calculation method of the cooling liquid flow F1 flowing into the liquid side inlet of the heat exchanger is as follows: .

[0015] Preferably, the calculation method of the cooling liquid temperature of the liquid side inlet of the heat exchanger is as follows:

[0016] ;

[0017] Wherein, T0 is the cooling system outlet cooling liquid temperature.

[0018] Preferably, after obtaining the basic cooling liquid flow corresponding to the initial temperature adjustment parameter provided by the cooling system in step 4, the basic cooling liquid flow is reduced by a preset ratio to obtain an adjusted basic cooling liquid flow, and then the liquid supply pipeline driving pump is controlled to provide the adjusted basic cooling liquid flow.

[0019] Wherein, the wind tunnel is a backflow type wind tunnel, and the wind tunnel airflow temperature regulation system comprises a heat exchanger, a cooling liquid pipeline and a cooling system, the heat exchanger is installed in the airflow channel of the wind tunnel, and the liquid side inlet and outlet of the heat exchanger are communicated with the outlet and inlet of the cooling system through the cooling liquid pipeline to form a cooling loop.

[0020] Preferably, a liquid supply pipeline driving pump is installed on the cooling liquid pipeline. The liquid supply pipeline driving pump can drive the cooling liquid to flow.

[0021] Preferably, a temperature adjustment bypass driving pump is installed on the temperature adjustment bypass. The temperature adjustment bypass driving pump can separate part of the cooling liquid from the cooling liquid pipeline to the temperature adjustment bypass, and then mix with the cooling liquid processed by the cooling system and flow into the liquid side inlet of the heat exchanger.

[0022] Preferably, a first temperature detection component is installed at the liquid side inlet of the heat exchanger, a second temperature detection component is installed at the liquid side outlet of the heat exchanger, and a third temperature detection component is installed at the cooling liquid outlet of the cooling system. The temperature detection components can obtain the temperature of the cooling liquid at the corresponding position, so as to provide the control basis and parameters of flow and temperature.

[0023] Preferably, cooling liquid flow detection components are installed at the temperature adjustment bypass, the liquid side inlet of the heat exchanger and the cooling liquid outlet of the cooling system. The flow detection components can monitor the real-time flow at the temperature adjustment bypass, the liquid side inlet of the heat exchanger and the cooling liquid outlet of the cooling system.

[0024] The one or more technical solutions provided by the present application have at least the following technical effects or advantages:

[0025] The application eliminates the adjustment delay caused by the cooling liquid delivery time between the cooling system and the heat exchanger, accelerates the temperature adjustment response of the cooling liquid at the inlet of the liquid side of the heat exchanger, and thus improves the air flow temperature adjustment speed.

[0026] The application adopts the combined temperature adjustment strategy of liquid supply driven pump coarse adjustment and temperature adjustment bypass fine adjustment, and the method of calculating the preset initial adjustment parameter, which is beneficial to improve the air flow temperature adjustment speed.

[0027] The application controls the air flow temperature by adjusting the cooling liquid temperature at the inlet of the liquid side of the heat exchanger through the temperature adjustment bypass, and the flow change range in the pipeline is reduced during the adjustment process, which enhances the stability of the system operation. BRIEF DESCRIPTION OF DRAWINGS

[0028] The accompanying drawings described herein are used to provide further understanding of the embodiments of the application, and form a part of the application, and do not constitute a limitation on the embodiments of the application.

[0029] Figure 1 The temperature fast regulation schematic diagram suitable for the cooling system + heat exchanger type temperature control system;

[0030] In the figure: 1, air flow channel; 2, heat exchanger; 3, cooling liquid pipeline; 4, liquid supply pipeline driven pump; 5, cooling system; 6, temperature adjustment bypass driven pump. DETAILED DESCRIPTION

[0031] In order to more clearly understand the above-mentioned purposes, features and advantages of the application, the application will be further described in detail below in combination with the drawings and specific embodiments. It should be noted that the embodiments of the application and the features in the embodiments can be combined with each other without conflict.

[0032] In the following description, many specific details are set forth in order to provide a thorough understanding of the application, but the application can also be implemented in other ways different from the scope described herein, therefore, the protection scope of the application is not limited by the specific embodiments disclosed below.

[0033] Embodiment one:

[0034] The embodiment of the application provides a wind tunnel air flow temperature fast control system and a corresponding method, which is suitable for the application scene of rapidly and accurately controlling the air flow temperature in the air flow channel by using the cooling liquid in the heat exchanger. Through the system and method, the regulation speed of the air flow temperature can be improved, and the adjustment strategy of the temperature control system can be optimized according to the actual working condition.

[0035] The embodiment of the present application provides a temperature quick regulation method based on a cooling system+heat exchanger type temperature control system, which overcomes the problems of time response lag in temperature regulation by a conventional cooling system and great difficulty in regulation caused by heat loss of a pipeline.

[0036] The present application is directed to a recirculation wind tunnel.

[0037] Please refer to Figure 1 , Figure 1 The temperature quick regulation principle diagram suitable for the cooling system+heat exchanger type temperature control system is provided. The system comprises a heat exchanger 2, a cooling liquid pipeline 3 and a cooling system 5, the heat exchanger is installed in an airflow channel 1 of the wind tunnel, a liquid side inlet and a liquid side outlet of the heat exchanger are communicated with an outlet and an inlet of the cooling system through the cooling liquid pipeline to form a cooling loop, the system further comprises a temperature regulation bypass arranged between the heat exchanger and the cooling system, the temperature regulation bypass is used for diverting a part of cooling liquid flowing out of the liquid side outlet of the heat exchanger without being treated by the cooling system, and the diverted cooling liquid is mixed with the cooling liquid treated by the cooling system and then flows into the liquid side inlet of the heat exchanger. A liquid supply pipeline driving pump 4 is installed on the cooling liquid pipeline. A temperature regulation bypass driving pump 6 is installed on the temperature regulation bypass. A first temperature detection assembly is installed at the liquid side inlet of the heat exchanger, a second temperature detection assembly is installed at the liquid side outlet of the heat exchanger, and a third temperature detection assembly is installed at the cooling liquid outlet of the cooling system. Cooling liquid flow detection assemblies are installed at the temperature regulation bypass, the liquid side inlet of the heat exchanger and the cooling liquid outlet of the cooling system.

[0038] The system in the present application adds a temperature regulation bypass between the liquid side inlet and the liquid side outlet of the heat exchanger based on the conventional cooling system+heat exchanger type temperature control system, adds a temperature regulation bypass driving pump, sucks a part of high-temperature cooling liquid flowing out of the heat exchanger to the liquid side inlet of the heat exchanger, mixes the high-temperature cooling liquid with low-temperature cooling liquid sent by the liquid supply pipeline and then flows into the heat exchanger, and then the remaining high-temperature cooling liquid flows back to the cooling system to be cooled and then is sent to the liquid side inlet of the heat exchanger by the liquid supply pipeline driving pump. By changing the flow of the temperature regulation bypass, the flow ratio of cold and hot cooling liquid at the liquid side inlet of the heat exchanger can be quickly adjusted, so that the temperature of the cooling liquid at the liquid side inlet of the heat exchanger is adjusted; the temperature regulation bypass is arranged beside the heat exchanger, which eliminates the adjustment delay caused by the cooling liquid conveying time between the cooling system and the heat exchanger, and accelerates the change speed of the cooling liquid temperature at the liquid side inlet of the heat exchanger, so that the airflow temperature is quickly adjusted.

[0039] The specific regulation method is as follows:

[0040] By formula (1), the estimated cooling liquid flow rate F0 can be obtained from the designed heat exchanger performance parameters, the gas inlet parameters and the cooling liquid inlet parameters of the heat exchanger under the test conditions, and the target temperature of the gas (i.e. the gas outlet parameters), which is used as the basic cooling liquid flow rate provided by the supply liquid pipeline driving pump, i.e. the basic cooling liquid flow rate provided by the cooling system. In formula (1), the heat transfer temperature difference of the heat exchanger The logarithmic mean temperature difference can be calculated according to formula (2).

[0041] ; (1)

[0042] ; (2)

[0043] The temperature control bypass flow rate is set as Fb, formula (3) and the mixed heat exchanger inlet cooling liquid temperature formula (4) can be obtained.

[0044] ; (3)

[0045] ; (4)

[0046] The gas outlet temperature T0 can be iteratively calculated according to formula (1), formula (2) and formula (4). According to the above, the influence of the temperature control bypass flow rate on the outlet gas temperature under different test conditions can be evaluated, and the optimal temperature control strategy can be obtained, and the initial temperature control parameters, including the basic cooling liquid flow rate of the supply liquid pipeline and the temperature control bypass flow rate, can be predicted, so as to further accelerate the speed of the gas temperature stable regulation.

[0047] In terms of temperature control strategy, the basic cooling liquid flow rate is provided by the supply liquid pipeline driving pump for rough temperature adjustment, so that the gas temperature can be controlled near the target temperature, and then the temperature control bypass driving pump is adjusted to change the temperature control bypass cooling liquid flow rate, so that the gas temperature can be quickly and accurately adjusted by adjusting the cooling liquid temperature at the inlet of the heat exchanger.

[0048] Regarding temperature control strategies, since changing the coolant temperature at the liquid-side inlet of the heat exchanger has a significant impact on the heat exchanger's temperature difference, and the greater the temperature difference of the coolant passing through the heat exchanger, the greater the amplitude of the coolant temperature change at the liquid-side inlet of the heat exchanger caused by the same change in the temperature-regulating bypass flow rate, and the stronger the regulation effect on the airflow temperature. Therefore, the basic cooling flow rate supplied by the pump driven by the supply pipeline should be appropriately reduced to increase the coolant temperature difference passing through the heat exchanger, thereby obtaining excellent regulation performance. The amount of reduction depends on the required temperature control rate and the operating conditions of the test. The reduction amount can be adjusted based on the following two conditions: first, the regulation capability of the temperature-regulating bypass (the airflow temperature change caused by regulation must reach the target airflow temperature) must achieve the target; second, the amplitude of flow rate change during the regulation process must be reduced to decrease system fluctuations and ensure stable and safe operation. Specific amounts are adjusted according to actual needs, and this embodiment of the invention does not impose corresponding limitations or elaborate on them.

[0049] Example 2:

[0050] Based on Embodiment 1, Embodiment 2 of the present invention provides a data illustration of the present invention in conjunction with specific implementation examples:

[0051] Implementation Case 1 (High Temperature Operating Conditions): For example Figure 1 The temperature control system shown has a coolant flow rate of 2 m / s in the supply pipeline and a flow rate F0 of 1600 kg / s; the cooling system is 100 m away from the heat exchanger, and the coolant temperature T0 supplied to the heat exchanger is 305 K; the heat exchanger has a heat exchange area of ​​30,000 m². 2 heat transfer coefficient Gas flow rate 1000 kg / s, heat exchanger inlet gas temperature 600 K.

[0052] When the airflow temperature is not controlled by the temperature bypass: (1) The temperature is adjusted by adjusting the coolant flow rate. When the coolant flow rate is 1600 kg / s, the outlet airflow temperature of the heat exchanger is 359.16 K. When the coolant flow rate is 1500 kg / s, the outlet airflow temperature of the heat exchanger is 359.67 K. (2) The temperature is adjusted by adjusting the inlet coolant temperature of the heat exchanger through the cooling system. The liquid after the cooling system is adjusted takes about 50 seconds to reach the heat exchanger, which is a long delay time.

[0053] When a temperature-controlled bypass is used for airflow temperature control: the coolant flow rate of the temperature-controlled bypass is adjusted to 100 kg / s, and the coolant inflow rate in the supply line is reduced from 1600 kg / s to 1500 kg / s, resulting in an outlet airflow temperature of 361.14 K for the heat exchanger. It is evident that with the temperature-controlled bypass, the same change in the supply line flow rate leads to a greater variation in outlet airflow temperature, significantly improving the system's temperature regulation capability. Because the temperature-controlled bypass is located at the heat exchanger inlet and outlet, the temperature regulation response is very rapid.

[0054] Implementation Case 2 (Low Temperature Operation Condition): such as Figure 1 The temperature control system shown has a coolant flow rate of 1 m / s in the supply pipeline and a flow rate F0 of 800 kg / s; the cooling system is 100 m away from the heat exchanger, and the coolant temperature T0 supplied to the heat exchanger is 305 K; the heat exchanger has a heat exchange area of ​​30,000 m². 2 heat transfer coefficient The gas flow rate is 1400 kg / s, and the inlet gas temperature of the heat exchanger is 370 K.

[0055] When the airflow temperature is not controlled by the temperature bypass: (1) The temperature is adjusted by adjusting the coolant flow rate. When the coolant flow rate is 800 kg / s, the outlet airflow temperature of the heat exchanger is 323.28 K. When the coolant flow rate is 750 kg / s, the outlet airflow temperature of the heat exchanger is 324.00 K. (2) The temperature is adjusted by adjusting the inlet coolant temperature of the heat exchanger through the cooling system. The liquid after the cooling system temperature adjustment takes about 100 seconds to reach the heat exchanger, which is a long delay time.

[0056] When using a temperature-controlled bypass for airflow temperature control: the coolant flow rate in the bypass is adjusted to 100 kg / s, and the coolant inflow rate in the supply line is reduced from 800 kg / s to 700 kg / s, resulting in an outlet airflow temperature of 325.23 K for the heat exchanger. It is evident that with the temperature-controlled bypass, the same change in supply line flow rate leads to a greater variation in outlet airflow temperature, significantly improving the system's temperature regulation capability. Because the temperature-controlled bypass is located at the heat exchanger inlet and outlet, the temperature regulation response is extremely fast.

[0057] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0058] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method of regulating the temperature of a flow of air in a wind tunnel, characterized by, The method is applied to a temperature regulation system for a wind tunnel airflow, and the system comprises a temperature regulation bypass arranged between a heat exchanger and a cooling system, the temperature regulation bypass being used to divert a portion of cooling liquid flowing out of a liquid side outlet of the heat exchanger without being processed by the cooling system, and the diverted cooling liquid is mixed with cooling liquid processed by the cooling system and then flows into a liquid side inlet of the heat exchanger, and the method comprises the following steps: Step 1: setting a test working condition, calculating a cooling liquid flow rate F0 based on performance parameters of the heat exchanger, airflow inlet parameters of the heat exchanger at the test working condition, cooling liquid inlet parameters of the heat exchanger, and a target temperature of the airflow, and taking the cooling liquid flow rate F0 as a basic cooling liquid flow rate to be provided by the cooling system; Step 2: setting a cooling liquid flow rate Fb of the temperature regulation bypass, calculating a cooling liquid flow rate F1 flowing into the liquid side inlet of the heat exchanger based on the cooling liquid flow rate F0 and the cooling liquid flow rate Fb, and calculating an airflow outlet temperature Tao of the heat exchanger gas side based on a cooling liquid temperature T2 at the liquid side outlet of the heat exchanger, the cooling liquid flow rate F0, the cooling liquid flow rate F1, the cooling liquid flow rate Fb, and an airflow inlet temperature Tai at the airflow inlet of the heat exchanger; Step 3: adjusting the test working condition to obtain an influence of the cooling liquid flow rate Fb on the airflow outlet temperature Tao at different test working conditions, and obtaining temperature regulation initial parameters at different test working conditions; Step 4: obtaining a target working condition, obtaining corresponding temperature regulation initial parameters based on the target working condition, providing a basic cooling liquid flow rate corresponding to the temperature regulation initial parameters by the cooling system based on the temperature regulation initial parameters, providing a cooling liquid flow rate corresponding to the temperature regulation initial parameters by the temperature regulation bypass, and coarsely regulating the airflow outlet temperature Tao to be close to a target temperature; and then adjusting the cooling liquid flow rate of the temperature regulation bypass to close-loop regulate the airflow outlet temperature Tao to the target temperature; The calculation method of the cooling liquid flow rate F0 is as follows: ； ； wherein, is the heat transfer power from the gas to the coolant at steady state heat transfer of the heat exchanger, is the specific heat capacity of the gas at constant pressure, is the gas-side flow rate, is the specific heat capacity of the coolant at constant pressure, is the heat transfer coefficient of the heat exchanger, is the heat transfer area of the heat exchanger, is the heat transfer temperature difference of the heat exchanger, and T1 is the coolant temperature at the inlet of the liquid side of the heat exchanger.

2. The method of claim 1, wherein, The calculation method of the cooling liquid flow rate F1 flowing into the liquid side inlet of the heat exchanger is as follows: .

3. The method of claim 1, wherein the temperature of the flow of air is controlled by adjusting the temperature of the air in the first section of the wind tunnel. The calculation method of the cooling liquid temperature at the liquid side inlet of the heat exchanger is as follows: ； Wherein, T0 is an outlet cooling liquid temperature of the cooling system.

4. The method of claim 1, wherein, After obtaining the basic cooling liquid flow rate corresponding to the temperature regulation initial parameters to be provided by the cooling system in the step 4, the basic cooling liquid flow rate is reduced by a preset proportion to obtain an adjusted basic cooling liquid flow rate, and then the adjusted basic cooling liquid flow rate is controlled to be provided by a liquid supply pipeline driving pump.

5. The method of claim 1, wherein, The wind tunnel is a recirculating wind tunnel, and the system comprises a heat exchanger, a cooling liquid pipeline, and a cooling system, the heat exchanger is installed in an airflow channel of the wind tunnel, a liquid side inlet and a liquid side outlet of the heat exchanger are communicated with an outlet and an inlet of the cooling system through the cooling liquid pipeline to form a cooling loop.

6. A method of regulating the temperature of a flow of air in a wind tunnel as claimed in claim 5, wherein, A liquid supply pipeline driving pump is installed on the cooling liquid pipeline.

7. The method of claim 5, wherein the temperature of the flow of air is controlled by adjusting the temperature of the air in the first chamber and the temperature of the air in the second chamber. A temperature regulation bypass driving pump is installed on the temperature regulation bypass.

8. The method of claim 5, wherein the temperature of the flow of air is controlled by adjusting the temperature of the air in the first chamber. A first temperature detection assembly is installed at the liquid side inlet of the heat exchanger, a second temperature detection assembly is installed at the liquid side outlet of the heat exchanger, and a third temperature detection assembly is installed at a cooling liquid outlet of the cooling system.

9. The method of claim 1, wherein, Cooling liquid flow rate detection assemblies are installed at the temperature regulation bypass, the liquid side inlet of the heat exchanger, and the cooling liquid outlet of the cooling system.

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