CN115826656A - Low-temperature wind tunnel simulation environment rapid adjusting device and adjusting method - Google Patents
Low-temperature wind tunnel simulation environment rapid adjusting device and adjusting method Download PDFInfo
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Abstract
The invention belongs to the field of wind tunnel environment control, and discloses a low-temperature wind tunnel simulation environment rapid adjusting device and an adjusting method. The adjusting device comprises a simulated environment room, a temperature adjusting system and a humidity and carbon dioxide concentration adjusting system, wherein the temperature adjusting system and the humidity and carbon dioxide concentration adjusting system are used for adjusting the simulated environment room; the temperature adjusting system comprises a liquid nitrogen heat exchanger and a heater, and the liquid nitrogen heat exchanger is connected with a liquid nitrogen inlet device and a nitrogen reflux device; the humidity and carbon dioxide concentration adjusting system comprises an air compressor, a water vapor adsorption tower and a carbon dioxide adsorption tower, the air compressor is further connected with an air inlet device in parallel, and the carbon dioxide adsorption tower is further connected with an air exhaust device in parallel. The adjusting method comprises the steps of setting target parameters, operating a humidity and carbon dioxide concentration adjusting system and operating a temperature adjusting system. The adjusting device and the adjusting method can realize rapid and accurate adjustment of the temperature, the pressure, the water content and the carbon dioxide content of a room in a simulated environment, truly simulate the low-temperature wind tunnel test environment and improve the preparation efficiency of the low-temperature wind tunnel test.
Description
Technical Field
The invention belongs to the field of wind tunnel environment control, and particularly relates to a low-temperature wind tunnel simulation environment rapid adjusting device and method.
Background
In the low-temperature wind tunnel test process, when the test model state needs to be changed, in order to save the changing time, a simulated environment room similar to the low-temperature wind tunnel test state is built, the test model is changed and adjusted, and personnel can be prevented from entering the real environment operation with limited conditions. Meanwhile, in the test preparation process, in order to verify the state of the equipment in the test environment and measure the running condition of the control device, static tests are carried out in a simulated environment room in advance, so that the static functions of the related equipment can be tested, and test errors are reduced. Therefore, the simulation test room needs to be capable of simulating characteristic parameters such as temperature, pressure, humidity, carbon dioxide content and the like in the low-temperature wind tunnel test.
In a conventional wind tunnel, the difference between a test environment and a real environment is not large, and a separate simulated environment room is generally not required to be built. However, in a low-temperature wind tunnel, the test temperature has a wide variation range, which may affect devices such as a sensor, and at the same time, the content of water and carbon dioxide in the test environment may also affect the test result, so that the corresponding parameters need to be accurately controlled to accurately simulate the test environment.
In the low-temperature wind tunnel simulation environment control, no mature case exists at present for achieving the purposes that the water and carbon dioxide content is lower than 10ppm and the temperature is accurately adjusted within the range of 110K-323K in an environment space with a certain size. In the control of the simulated environment, the temperature adjusting time cannot be too long, so that the aim of improving the test preparation efficiency is fulfilled.
At present, a quick adjusting device and an adjusting method for a low-temperature wind tunnel simulation environment are needed to be developed.
Disclosure of Invention
The invention aims to provide a device for quickly adjusting a low-temperature wind tunnel simulation environment, and the invention aims to provide a method for quickly adjusting a low-temperature wind tunnel simulation environment.
The invention discloses a low-temperature wind tunnel simulated environment quick adjusting device which is characterized by comprising a simulated environment room, a temperature adjusting system for adjusting the simulated environment room, and an adjusting system for adjusting the humidity and the carbon dioxide concentration of the simulated environment room;
the temperature adjusting system comprises a liquid nitrogen heat exchanger and a heater which are sequentially connected through a pipeline according to the flowing direction of air flow, and a closed loop which is formed from a room in the simulated environment to the liquid nitrogen heat exchanger, then to the heater and finally back to the room in the simulated environment is formed; the liquid nitrogen heat exchanger is connected with a liquid nitrogen inlet device and a nitrogen reflux device;
the humidity and carbon dioxide concentration regulating system comprises an air compressor, a water vapor adsorption tower and a carbon dioxide adsorption tower which are sequentially connected through pipelines according to the flowing direction of air flow, and a closed loop which is formed from a simulated environment room to the air compressor, the water vapor adsorption tower, the carbon dioxide adsorption tower and finally returns to the simulated environment room is formed; the air compressor is also connected with an air inlet device in parallel, and the carbon dioxide adsorption tower is also connected with an air exhaust device in parallel.
Further, the space volume of the room of the simulated environment is 300m 3 。
Further, the flow rate of liquid nitrogen of the liquid nitrogen heat exchanger is 3.5kg/s.
Further, the heating power of the heater is 50KW.
Further, the flow rate of the air compressor is 5000Nm 3 /h。
Furthermore, the exhaust dew point of the water gas adsorption tower and the exhaust dew point of the carbon dioxide adsorption tower are-70 ℃, and the concentration of the carbon dioxide is 5ppm.
Further, the air inlet flow of the air inlet device is 4000m 3 H, the exhaust flow of the air exhaust device is 4000m 3 /h。
The invention discloses a method for quickly adjusting a low-temperature wind tunnel simulation environment, which comprises the following steps of:
s10, setting target parameters;
setting target parameters of a room of a simulated environment: including temperature, water content, carbon dioxide content and pressure ranges;
s20, operating a humidity and carbon dioxide concentration adjusting system;
s21, the air inlet device sucks ambient air, the ambient air is pretreated, and the pretreated ambient air and air pumped from a simulated environment room enter an air compressor;
s22, starting an air compressor to perform compression and dehumidification;
s23, starting a water vapor adsorption tower to perform adsorption and dehumidification;
s24, starting a carbon dioxide adsorption tower to adsorb and remove carbon dioxide;
s25, adjusting the air pressure entering a room of the simulated environment;
presetting a starting threshold value of an air exhaust device, monitoring the air pressure flowing out of the carbon dioxide adsorption tower by the air exhaust device, if the air pressure is greater than the starting threshold value, starting the air exhaust device to exhaust and reduce the pressure, otherwise, keeping the air exhaust device in a closed state;
s26, repeating the steps S21-S25, and circularly processing the air of the simulated environment room until the water content, the carbon dioxide content and the pressure of the air of the simulated environment room reach preset target parameters;
s30, operating a temperature adjusting system;
if the temperature of the air in the simulated environment room is higher than the preset temperature, starting a cooling process of the temperature regulating system, and if the temperature of the air in the simulated environment room is lower than the preset temperature, starting a heating process of the temperature regulating system; circularly processing the air of the simulated environment room until the air of the simulated environment room reaches the target temperature;
s31, cooling process
Starting a liquid nitrogen heat exchanger, sucking liquid nitrogen by the liquid nitrogen heat exchanger through a liquid nitrogen inlet device, performing heat exchange and cooling on air pumped out of a room in the simulated environment through liquid nitrogen evaporation, and discharging waste nitrogen through a nitrogen reflux device; when the temperature of the air in the simulated environment room is reduced to a preset temperature, the liquid nitrogen inlet device is closed, and the liquid nitrogen heat exchanger only has the function of a circulation channel;
s32, heating process
And starting the heater, heating the air which is pumped out from the simulated environment room and passes through the liquid nitrogen heat exchanger, and closing the heater after the temperature of the air in the simulated environment room is raised to the preset temperature, wherein the heater only has the function of a circulation channel.
Further, the temperature range of the target parameter is 110K-323K, and the content of water and carbon dioxide is less than 10ppm.
Aiming at the requirements of target parameters such as temperature, water content, carbon dioxide content, pressure and the like which need to be simulated quickly and accurately in the low-temperature wind tunnel simulation environment, the low-temperature wind tunnel simulation environment quick adjusting device and the adjusting method control the water content through two-stage dehumidification of compressor compression and a water-gas absorption tower; adsorbing carbon dioxide by a carbon dioxide adsorption tower to control the content of the carbon dioxide; the pressure range is adjusted through the air inlet device and the air exhaust device, and the pressure is controlled; the liquid nitrogen heat exchanger reduces the temperature by sucking liquid nitrogen for gasification and increases the temperature by heating the liquid nitrogen through the heater, thereby achieving the purpose of adjusting the temperature. The target parameters can be controlled simultaneously, so that the aim of quick adjustment is fulfilled, a reliable environment simulation room is provided for low-temperature wind tunnel test preparation, and the low-temperature wind tunnel test preparation efficiency is improved.
In short, the low-temperature wind tunnel simulation environment rapid adjusting device and the adjusting method can achieve rapid and accurate adjustment of the temperature, the pressure, the water content and the carbon dioxide content of a room in a simulation environment, truly simulate a low-temperature wind tunnel test environment, and improve the preparation efficiency of a low-temperature wind tunnel test.
Drawings
Fig. 1 is a schematic structural diagram of a low-temperature wind tunnel simulated environment rapid adjusting device of the invention.
In the figure, 1, an environment room is simulated; 2. a liquid nitrogen heat exchanger; 3. a heater; 4. a liquid nitrogen inlet device; 5. a nitrogen reflux device; 6. an air compressor; 7. a water gas adsorption tower; 8. a carbon dioxide adsorption tower; 9. an air intake device; 10. an air exhaust device.
Detailed description of the preferred embodiments
The present invention will be described in detail below with reference to the accompanying drawings and examples.
The present embodiment does not limit the present invention in any way, and all technical solutions obtained by adopting equivalent substitution modes fall within the protection scope of the present invention.
Example 1
After the last low-temperature wind tunnel test is completed, the test model transfer device takes out the low-temperature wind tunnel test model, the low-temperature wind tunnel test model is placed in the simulated environment room 1 in the natural environment state and is installed on the supporting device of the simulated environment room 1, a worker enters the simulated environment room 1, and the test model is adjusted to be in the test model state of the next low-temperature wind tunnel test. The staff leaves the simulated environment room 1, and outside the simulated environment room 1, the simulated environment room 1 is adjusted to the environmental parameters of the next low-temperature wind tunnel test by the low-temperature wind tunnel simulated environment rapid adjustment method of the embodiment. The test model is gradually adapted to the environmental parameters of the next low-temperature wind tunnel test in the simulated environment room 1, stands by in the simulated environment room 1, and is conveyed into the low-temperature wind tunnel through the test model transfer device before the next low-temperature wind tunnel test is started and is installed on the support device of the low-temperature wind tunnel.
As shown in fig. 1, the low-temperature wind tunnel simulated environment rapid adjusting device of the embodiment is characterized by comprising a simulated environment room 1, a temperature adjusting system for adjusting the simulated environment room 1, and a humidity and carbon dioxide concentration adjusting system for adjusting the simulated environment room 1;
the temperature adjusting system comprises a liquid nitrogen heat exchanger 2 and a heater 3 which are sequentially connected through a pipeline according to the flowing direction of air flow, and a closed loop which is formed from a simulated environment room 1 to the liquid nitrogen heat exchanger 2, then to the heater 3 and finally returns to the simulated environment room 1 is formed; the liquid nitrogen heat exchanger 2 is connected with a liquid nitrogen inlet device 4 and a nitrogen reflux device 5;
the humidity and carbon dioxide concentration regulating system comprises an air compressor 6, a water vapor adsorption tower 7 and a carbon dioxide adsorption tower 8 which are sequentially connected through pipelines according to the flowing direction of air flow, and a closed loop is formed from the simulated environment room 1 to the air compressor 6, the water vapor adsorption tower 7, the carbon dioxide adsorption tower 8 and finally back to the simulated environment room 1; the air compressor 6 is also connected in parallel with an air intake device 9, and the carbon dioxide adsorption tower 8 is also connected in parallel with an air exhaust device 10.
Further, the space volume of the simulated environment room 1 is 300m 3 。
Further, the flow rate of liquid nitrogen of the liquid nitrogen heat exchanger 2 is 3.5kg/s.
Further, the heating power of the heater 3 is 50KW.
Further, the flow rate of the air compressor 6 is 5000Nm 3 /h。
Further, the exhaust dew point of the water gas adsorption tower 7 and the carbon dioxide adsorption tower 8 is-70 ℃, and the concentration of carbon dioxide is 5ppm.
Further, the air inlet flow of the air inlet device 9 is 4000m 3 H, the exhaust flow rate of the air exhaust device 10 is 4000m 3 /h。
The method for quickly adjusting the low-temperature wind tunnel simulation environment comprises the following steps:
s10, setting target parameters;
setting target parameters of the simulated environment room 1: the target temperature is 200K, the water content is lower than 10ppm, the carbon dioxide content is lower than 10ppm, and the pressure range is 96-101 kpa;
s20, operating a humidity and carbon dioxide concentration adjusting system;
s21, sucking ambient air by the air inlet device 9, preprocessing the ambient air, and enabling the preprocessed ambient air and air pumped out from the simulated ambient room 1 to enter the air compressor 6;
s22, starting the air compressor 6 to perform compression and dehumidification;
s23, starting the water-gas adsorption tower 7 to perform adsorption and dehumidification;
s24, starting the carbon dioxide adsorption tower 8 to adsorb and remove carbon dioxide;
s25, adjusting the air pressure entering the room 1 in the simulated environment;
presetting a starting threshold value of the air exhaust device 10 as 98kpa, monitoring the air pressure flowing out of the carbon dioxide adsorption tower 8 by the air exhaust device 10, if the air pressure is greater than the starting threshold value, starting the air exhaust device 10 to exhaust and reduce the pressure, otherwise, keeping the air exhaust device 10 in a closed state;
s26, repeating the steps S21-S25, and circularly processing the air in the simulated environment room 1 until the water content, the carbon dioxide content and the pressure of the air in the simulated environment room 1 reach preset target parameters;
after about 4 hours, the test shows that the water content in the room 1 of the simulated environment is 8ppm, the carbon dioxide content is 10ppm and the pressure is 98kpa, and the target parameters are reached;
s30, operating a temperature adjusting system;
because the temperature of the simulated environment room is 293K and is higher than the target temperature by 200K, a cooling process is started, a liquid nitrogen heat exchanger 2 is started, the liquid nitrogen heat exchanger 2 sucks liquid nitrogen through a liquid nitrogen inlet device 4, the air pumped out of the simulated environment room 1 is subjected to heat exchange and cooling through liquid nitrogen evaporation, and waste nitrogen is discharged through a nitrogen reflux device 5; after 1 hour, the temperature of the room 1 in the simulated environment is 199.5K, and the temperature regulation error is less than 1K, so that the requirement is met; the temperature adjustment is stopped.
Although embodiments of the invention have been described above, it is not intended to be limited to the specific details set forth in the description or the embodiments, but rather, to one skilled in the art, that all of the features of the invention disclosed, or all of the steps of any method or process disclosed, may be combined in any suitable manner, except for mutually exclusive features and/or steps, without departing from the principles of the invention, and that the invention is not limited to the specific details set forth and illustrated in the drawings described herein.
Claims (9)
1. A low-temperature wind tunnel simulated environment rapid adjusting device is characterized by comprising a simulated environment room (1), a temperature adjusting system for adjusting the simulated environment room (1), and a humidity and carbon dioxide concentration adjusting system for adjusting the simulated environment room (1);
the temperature regulating system comprises a liquid nitrogen heat exchanger (2) and a heater (3) which are sequentially connected through a pipeline according to the flowing direction of air flow, and a closed loop which is formed from the simulated environment room (1) to the liquid nitrogen heat exchanger (2) and then to the heater (3) and finally returns to the simulated environment room (1) is formed; the liquid nitrogen heat exchanger (2) is connected with a liquid nitrogen inlet device (4) and a nitrogen reflux device (5);
the humidity and carbon dioxide concentration regulating system comprises an air compressor (6), a water vapor adsorption tower (7) and a carbon dioxide adsorption tower (8) which are sequentially connected through pipelines according to the flowing direction of air flow, and a closed loop is formed, wherein the closed loop is formed by connecting the air compressor (6) to the water vapor adsorption tower (7) and then to the carbon dioxide adsorption tower (8) from the simulated environment room (1), and finally returning to the simulated environment room (1); the air compressor (6) is also connected with an air inlet device (9) in parallel, and the carbon dioxide adsorption tower (8) is also connected with an air exhaust device (10) in parallel.
2. The low-temperature wind tunnel simulation environment rapid adjusting device according to claim 1, wherein the space volume of the simulation environment room (1) is 300m 3 。
3. The low-temperature wind tunnel simulation environment quick adjusting device according to claim 1, wherein the liquid nitrogen flow of the liquid nitrogen heat exchanger (2) is 3.5kg/s.
4. The low-temperature wind tunnel simulation environment quick adjusting device according to claim 1, wherein the heating power of the heater (3) is 50KW.
5. The method of claim 1The low-temperature wind tunnel simulation environment rapid adjusting device is characterized in that the flow of the air compressor (6) is 5000Nm 3 /h。
6. The low-temperature wind tunnel simulated environment rapid adjusting device according to claim 1, wherein the exhaust dew point of the water vapor adsorption tower (7) and the carbon dioxide adsorption tower (8) is-70 ℃, and the concentration of carbon dioxide is 5ppm.
7. The low-temperature wind tunnel simulation environment quick adjusting device according to claim 1, wherein the air inlet flow of the air inlet device (9) is 4000m 3 H, the exhaust flow of the air exhaust device (10) is 4000m 3 /h。
8. A method for rapidly adjusting a low-temperature wind tunnel simulated environment according to any one of claims 1~7, comprising the steps of:
s10, setting target parameters;
setting target parameters of a simulated environment room (1): including temperature, water content, carbon dioxide content and pressure ranges;
s20, operating a humidity and carbon dioxide concentration adjusting system;
s21, the air inlet device (9) sucks in ambient air, the ambient air is preprocessed, and the preprocessed ambient air and air pumped out from the simulated environment room (1) enter an air compressor (6);
s22, starting an air compressor (6) to perform compression and dehumidification;
s23, starting a water-gas adsorption tower (7) to perform adsorption and dehumidification;
s24, starting a carbon dioxide adsorption tower (8) to adsorb and remove carbon dioxide;
s25, adjusting the air pressure entering the room (1) in the simulated environment;
presetting a starting threshold value of an air exhaust device (10), monitoring the air pressure flowing out of the carbon dioxide adsorption tower (8) by the air exhaust device (10), if the air pressure is greater than the starting threshold value, starting the air exhaust device (10) to exhaust and reduce the pressure, otherwise, keeping the air exhaust device (10) in a closed state;
s26, repeating the steps S21-S25, and circularly processing the air of the simulated environment room (1) until the water content, the carbon dioxide content and the pressure of the air of the simulated environment room (1) reach preset target parameters;
s30, operating a temperature adjusting system;
if the temperature of the air in the simulated environment room (1) is higher than the preset temperature, starting a cooling process of the temperature regulating system, and if the temperature of the air in the simulated environment room (1) is lower than the preset temperature, starting a heating process of the temperature regulating system; circularly treating the air of the simulated environment room (1) until the air of the simulated environment room (1) reaches a target temperature;
s31, cooling process
Starting the liquid nitrogen heat exchanger (2), sucking liquid nitrogen into the liquid nitrogen heat exchanger (2) through a liquid nitrogen inlet device (4), performing heat exchange and cooling on air pumped out of the simulated environment room (1) through liquid nitrogen evaporation, and discharging waste nitrogen through a nitrogen reflux device (5); when the temperature of the air in the simulated environment room (1) is reduced to a preset temperature, the liquid nitrogen inlet device (4) is closed, and the liquid nitrogen heat exchanger (2) only has the function of a circulation channel;
s32, heating process
And starting the heater (3), heating the air which is pumped out from the simulated environment room (1) and passes through the liquid nitrogen heat exchanger (2), and closing the heater (3) after the temperature of the air in the simulated environment room (1) is raised to a preset temperature, wherein the heater (3) only has a circulation channel function.
9. The method for rapidly adjusting the simulation environment of a low-temperature wind tunnel according to claim 8, wherein the temperature range of the target parameter is 110K-323K, and the contents of water and carbon dioxide are both lower than 10ppm.
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