A cryogenic wind tunnel control system

Abstract

The utility model discloses a low temperature wind tunnel control system, including main control subsystem, main control subsystem communication connection monitoring control subsystem, power control subsystem, refrigeration control subsystem, vacuum control subsystem, spray control subsystem, and main control subsystem is used for controlling power control subsystem, refrigeration control subsystem, vacuum control subsystem, spray control subsystem's start -stop and according to the monitoring data of monitoring control subsystem controls the working condition of rest each control subsystem, power control subsystem is used for controlling power device drive wind tunnel inside gas circulation flow, refrigeration control subsystem is used for controlling refrigeration plant to transfer cold quantity to wind tunnel, vacuum control subsystem is used for controlling vacuum simulation device adjustment control wind tunnel inside air pressure, and spray control subsystem is used for controlling spray device to generate water mist, the utility model discloses through main control subsystem control low temperature wind tunnel's automatic test operation flow, makes each subsystem can follow target parameter and time sequence automatic operation.

Description

Technical Field

[0001] This utility model relates to the field of wind tunnel control technology, specifically to a low-temperature wind tunnel control system. Background Technology

[0002] A wind tunnel, or wind tunnel laboratory, is a tubular experimental device that artificially generates and controls airflow to simulate the flow of gas around an aircraft or physical object. It measures the effects of airflow on the object and observes physical phenomena. It is one of the most commonly used and effective tools for aerodynamic experiments. An icing (low-temperature) wind tunnel is a large, complex special-purpose wind tunnel. Its principle is to construct a low-temperature, low-pressure, and high-humidity cloud environment within the wind tunnel, and then simulate the icing process of aircraft components as they pass through clouds through airflow. An icing wind tunnel is a ground-based test device for studying the icing morphology, icing tolerance, and anti-icing (de-icing) technologies of different components' windward surfaces and external sensors of detection instruments when an aircraft flies under icing weather conditions.

[0003] To ensure the normal operation of the cryogenic wind tunnel and provide stable environmental conditions for the experiment, it is necessary to monitor and control the operating parameters of each system of the wind tunnel throughout the entire process. Therefore, it is necessary to provide a cryogenic wind tunnel control system. Utility Model Content

[0004] This invention provides a low-temperature wind tunnel control system, which aims to realize the automated operation of the wind tunnel and the monitoring and control of its operating parameters, so as to provide stable environmental conditions for the experiment.

[0005] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows:

[0006] A cryogenic wind tunnel control system includes a main control subsystem, which is communicatively connected to a monitoring and control subsystem, a power control subsystem, a refrigeration control subsystem, a vacuum control subsystem, and a spray control subsystem. The main control subsystem is used to control the start and stop of the monitoring and control subsystem, the power control subsystem, the refrigeration control subsystem, the vacuum control subsystem, and the spray control subsystem, and to adjust the working status of the other control subsystems based on the monitoring data of the monitoring and control subsystem.

[0007] The power control subsystem controls the power unit to drive the gas circulation flow inside the wind tunnel; the refrigeration control subsystem controls the refrigeration unit to transfer cooling capacity into the wind tunnel; the vacuum control subsystem controls the vacuum simulation device to regulate the air pressure inside the wind tunnel; and the spray control subsystem controls the spray device to generate water mist.

[0008] Furthermore, the main control subsystem sends test start signals to the power control subsystem, refrigeration control subsystem, vacuum control subsystem, and spray control subsystem. The monitoring and control subsystem monitors the real-time pressure, temperature, and wind speed inside the wind tunnel. When the pressure, temperature, and wind speed inside the wind tunnel reach the target values, the main control subsystem sends a test start signal. When the set test time ends, the main control subsystem sends a test stop signal to complete the wind tunnel operation test.

[0009] Furthermore, the main control subsystem also includes a display device, which obtains the operating status and operating parameters of the other subsystems and displays them in real time through the display device.

[0010] Furthermore, the power control subsystem receives the test start signal sent by the main control subsystem, turns on the power motor and frequency converter of the power unit, drives the fan to rotate and drive the air circulation in the wind tunnel; the monitoring and control subsystem monitors the wind speed in the wind tunnel, and the power control subsystem adjusts the working parameters of the frequency converter according to the wind speed requirements to make the wind speed in the test section reach the target value and remain stable.

[0011] Furthermore, the power unit is located in the power section of the wind tunnel. The frequency converter is connected to the power motor, which in turn is connected to the fan. The frequency converter is communicatively connected to the power control subsystem. The power control subsystem receives commands from the main control subsystem and controls the start / stop and operating parameters of the frequency converter. The monitoring and control subsystem includes an absolute pressure sensor, which is installed in the test section and the stabilization section to measure the static pressure at the installation point and calculate the wind speed through the pressure difference. Based on the wind speed measured by the monitoring and control subsystem, the main control subsystem controls and adjusts the operating parameters of the frequency converter through the power control subsystem.

[0012] Furthermore, the refrigeration control subsystem receives the test start signal sent by the main control subsystem, turns on the refrigeration device, and provides cooling medium to the heat exchanger in the wind tunnel through the refrigeration device. The cooling medium exchanges heat with the flowing air in the heat exchanger, and the circulating air carries away the heat of the cooling medium, thereby cooling the air in the wind tunnel. The monitoring and control subsystem monitors the temperature in the wind tunnel in real time, and the refrigeration control subsystem controls and adjusts the operating parameters of the refrigeration device.

[0013] Furthermore, the refrigeration device includes a buffer water tank and a refrigeration unit. The heat exchanger is connected to the tunnel structure through an air inlet channel and an air outlet channel. The heat exchanger is connected to the buffer water tank through a heat exchange water inlet pipe and a heat exchange water outlet pipe. The buffer water tank is connected to the refrigeration unit through a buffer water tank outlet pipe and a buffer water tank return pipe. Water pumps are installed on the heat exchange water inlet pipe and the buffer water tank return pipe. Electric valves are installed on the heat exchange water inlet pipe, the heat exchange water outlet pipe, the buffer water tank outlet pipe, and the buffer water tank return pipe. The cooling medium in the buffer water tank is transported to the heat exchanger, where it exchanges heat with the air. Then it returns to the buffer water tank, and the cycle continues. The heat of the cooling medium is carried away by the circulating air, thus cooling the air in the wind tunnel.

[0014] Furthermore, the vacuum control subsystem receives the test start signal sent by the main control subsystem, turns on the vacuum unit of the vacuum simulation device, and the vacuum unit discharges the gas in the wind tunnel to the outside of the tunnel, reducing the air pressure in the wind tunnel to simulate the low-pressure environment at different altitudes. The monitoring and control subsystem monitors the air pressure in the wind tunnel in real time, and the vacuum control subsystem controls the working parameters of the vacuum unit to control the air pressure in the wind tunnel to reach the test target air pressure and keep it stable.

[0015] Furthermore, the vacuum simulation device also includes a pressure regulation module, which controls the pumping rate and intake rate of the vacuum unit through control valves; the monitoring and control subsystem includes a pressure sensor, which is installed inside the cave structure to detect the real-time pressure inside the cave structure.

[0016] Furthermore, the spray control subsystem receives the test start signal sent by the main control subsystem, activates the spray device in the wind tunnel test section, and controls the spray duration. The spray device includes a spray rake, which is composed of multiple spray rod arrays. A spray channel is set inside the spray rod, and a nozzle is set at the front end of the spray channel. The spray channel is connected to the spray water supply module through a spray water pipe and to the spray air supply module through a spray air pipe. A heat-insulating water pipe is also set side by side next to the spray water pipe, which is connected to the heating module. The spray water pipe and spray air pipe of each spray rod are controlled by a solenoid valve. The spray control subsystem can individually control the opening and closing of the solenoid valve of each spray water pipe and spray air pipe to regulate the spray volume. A humidity sensor is installed in the wind tunnel to measure the humidity inside the wind tunnel.

[0017] The beneficial effects of this utility model are as follows:

[0018] The low-temperature wind tunnel control system of this invention controls the automatic test operation process of the wind tunnel through the main control subsystem. By interacting with other subsystems, it controls the operation sequence of the other subsystems and sends the target parameters of the current test to the other subsystems, so that each subsystem can run automatically according to the target parameters and timing.

[0019] The low-temperature wind tunnel control system of this invention has a monitoring and control subsystem that can monitor environmental conditions such as temperature, pressure, humidity, and wind speed in the low-temperature wind tunnel in real time. The main control subsystem regulates the operating status and working parameters of each module through the power control subsystem, refrigeration control subsystem, vacuum control subsystem, and spray control subsystem. It can control, collect, and monitor a single subsystem, or organize and execute various types of wind tunnel tests according to the test plan, providing a stable test environment and ensuring the stable operation of the low-temperature wind tunnel. The main control subsystem can display the operating status and data monitoring of the subsystems, and is easy to operate and control. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the composition of an embodiment of the present utility model;

[0022] Figure 2 This is a schematic diagram of the refrigeration unit;

[0023] Figure 3 This is a schematic diagram of the spray bar structure.

[0024] Reference numerals: 101-Main control subsystem, 102-Monitoring and control subsystem, 103-Power control subsystem, 104-Refrigeration control subsystem, 105-Vacuum control subsystem, 106-Spray control subsystem; 11-Heat exchanger, 12-Buffer water tank, 13-Refrigeration unit, 14-Cooling tower, 61-Spray bar, 62-Nozzle, 63-Spray water pipe, 64-Spray air pipe, 65-Insulated water pipe, 66-Solenoid valve. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0026] A low-temperature wind tunnel control system, such as Figure 1 As shown, it includes a main control subsystem 101, which is connected to a monitoring and control subsystem 102, a power control subsystem 103, a refrigeration control subsystem 104, a vacuum control subsystem 105, and a spray control subsystem 106. The main control subsystem 101 is used to control the start and stop of the monitoring and control subsystem 102, the power control subsystem 103, the refrigeration control subsystem 104, the vacuum control subsystem 105, and the spray control subsystem 106, and to adjust the working status of the other control subsystems according to the monitoring data of the monitoring and control subsystem 102.

[0027] The power control subsystem 103 is used to control the power unit to drive the gas circulation flow in the wind tunnel, the refrigeration control subsystem 104 is used to control the refrigeration device to transfer cold energy into the wind tunnel, the vacuum control subsystem 105 is used to control the vacuum simulation device to regulate and control the air pressure in the wind tunnel, and the spray control subsystem 106 is used to control the spray device to generate water mist.

[0028] The main control subsystem 101 sends test start signals to the power control subsystem 103, cooling control subsystem 104, vacuum control subsystem 105, and spray control subsystem 106. The monitoring and control subsystem 102 monitors the real-time pressure, temperature, and wind speed inside the wind tunnel. When the pressure, temperature, and wind speed inside the wind tunnel reach the target values, it sends a test start signal. When the set test time ends, it sends a test stop signal, completing the wind tunnel operation test. The main control subsystem 101 controls the automatic test operation process of the wind tunnel. By interacting with the other subsystems, it controls the operation sequence of the other subsystems and sends the target parameters for the current test to the other subsystems, enabling each subsystem to operate automatically according to the target parameters and timing. The main control subsystem 101 also includes a display device, which obtains the main operating status and operating parameters of the other subsystems and displays them in real time.

[0029] The power control subsystem 103 receives the test start signal from the main control subsystem 101, turns on the power unit's motor and frequency converter, and drives the fan to rotate, causing the gas inside the wind tunnel to circulate. The monitoring and control subsystem 102 monitors the wind speed (airflow speed) inside the wind tunnel, and the power control subsystem 103 adjusts the operating parameters of the frequency converter according to the wind speed requirements, so that the wind speed in the test section reaches the target value and remains stable. Specifically, the power unit is located in the power section of the wind tunnel. The frequency converter is connected to the power motor, and the power motor is connected to the fan. The frequency converter is communicatively connected to the power control subsystem 103. The power control subsystem 103 receives commands from the main control subsystem 101, controls the start / stop of the frequency converter and its operating parameters, and turns on the frequency converter to drive the fan to rotate, causing the gas inside the wind tunnel to circulate. The monitoring and control subsystem 102 includes an absolute pressure sensor, which is installed in the test section and the stable section to measure the static pressure at the installation point and calculate the wind speed through the pressure drop. The main control subsystem 101 controls and adjusts the operating parameters of the frequency converter through the power control subsystem 103 based on the wind speed measured by the monitoring and control subsystem 102, so that the wind speed reaches stable control.

[0030] The refrigeration control subsystem 104 receives the test start signal sent by the main control subsystem 101, turns on the refrigeration device, and provides cooling medium to the heat exchanger 11 in the wind tunnel. The cooling medium exchanges heat with the flowing air in the heat exchanger 11, and the circulating air carries away the heat of the cooling medium, thus cooling the air in the wind tunnel. The monitoring and control subsystem 102 monitors the temperature in the wind tunnel in real time, and the refrigeration control subsystem 104 controls and adjusts the operating parameters of the refrigeration device to ensure that the wind tunnel reaches a stable test temperature. Preferably, the refrigeration device is as follows: Figure 2As shown, the system includes a buffer water tank 12 and a refrigeration unit 13. The heat exchanger 11 is connected to the cave structure via an air inlet channel and an air outlet channel. The heat exchanger 11 is connected to the buffer water tank 12 via a heat exchange inlet pipe and a heat exchange outlet pipe. The buffer water tank 12 is connected to the refrigeration unit 13 via a buffer water outlet pipe and a buffer water return pipe. Water pumps are installed on the heat exchange inlet pipe and the buffer water return pipe, and electric valves are installed on the heat exchange inlet pipe, the heat exchange outlet pipe, the buffer water outlet pipe, and the buffer water return pipe. The cooling medium in the buffer water tank 12 is transported to the heat exchanger 13. Inside the wind tunnel, heat is exchanged with air in heat exchanger 11, then returned to buffer water tank 12, and this cycle repeats. The circulating air carries away the heat from the cooling medium, cooling the air inside the wind tunnel to a stable test temperature. Refrigeration unit 13 is used to cool the cooling medium in buffer water tank 12. Monitoring and control subsystem 102 includes temperature sensors to monitor the temperature of the test section inside the wind tunnel. Main control subsystem 101, based on the temperature monitored by monitoring and control subsystem 102, controls and adjusts the operating parameters of the refrigeration device through refrigeration control subsystem 104 to stabilize the gas temperature inside the wind tunnel. Specifically, refrigeration control subsystem 104 regulates the operating parameters of each water pump and electric valve to control the temperature of the circulating water tank and the gas temperature inside the wind tunnel to meet experimental requirements. Refrigeration unit 13 includes multiple cascade units, each connected to buffer water tank 12. Refrigeration control subsystem 104 adjusts the number of cascade units in operation according to cooling needs, optimizing energy consumption. Furthermore, the refrigeration unit also includes a cooling tower 14, and the refrigeration unit 13 is connected to the cooling tower 14 through a cooling tower inlet pipe and a cooling tower outlet pipe, respectively; a water pump is installed on the cooling tower outlet pipe, and electric valves are installed on the cooling tower inlet pipe and the cooling tower outlet pipe; the cooling tower 14 is used to provide the initial cooling water required for the refrigeration unit 13, ensuring that the outlet water temperature of the refrigeration unit 13 meets the outlet water temperature requirements under the condition of system load changes, and also ensures the stable operation of the refrigeration unit, effectively solving the load fluctuation and frequent start-up and shutdown problems caused by insufficient system load.

[0031] The vacuum control subsystem 105 receives the test start signal sent by the main control subsystem 101, turns on the vacuum unit of the vacuum simulation device, and the vacuum unit expels the gas inside the wind tunnel to reduce the air pressure inside the wind tunnel to simulate the low-pressure environment at different altitudes. The monitoring and control subsystem 102 monitors the air pressure inside the wind tunnel in real time, and the vacuum control subsystem 105 controls the operating parameters of the vacuum unit to control the air pressure inside the wind tunnel to reach the test target air pressure and maintain stability. The vacuum simulation device also includes a pressure regulation module, which controls the pumping rate and intake rate of the vacuum unit through control valves. The monitoring and control subsystem 102 includes a pressure sensor, which is installed inside the tunnel structure to detect the real-time air pressure inside the tunnel structure. The vacuum control subsystem 105 calculates the simulated vacuum degree (altitude) based on the real-time air pressure detected by the pressure sensor and controls the operating parameters of the vacuum unit and the pressure regulation module to control the stable operation of the entire vacuum simulation system.

[0032] The spray control subsystem 106 receives the test start signal sent by the main control subsystem 101, activates the test section spray device, and controls the spray duration. The spray device includes a spray rake, such as... Figure 3 As shown, the spray rake consists of an array of multiple spray rods 61. Each spray rod 61 has a spray channel, and a nozzle 62 is installed at the front end of the spray channel. The spray channel is connected to a spray water supply module via a spray water pipe 63 and a spray air supply module via a spray air pipe 64. An insulated water pipe 65 is also installed alongside the spray water pipe 63, connecting to a heating module. Each spray rod's spray water pipe 63 and spray air pipe 64 are individually controlled by a solenoid valve 66. The spray control subsystem 106 can independently control the opening and closing of the solenoid valve 66 for each spray water pipe 63 and spray air pipe 64 to regulate the spray volume. A humidity sensor is installed inside the wind tunnel to measure the humidity inside the wind tunnel to accurately simulate the experimental environment.

[0033] Of course, there may be other embodiments of this utility model. Without departing from the spirit and essence of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, but these corresponding changes and modifications should all fall within the protection scope of the appended claims of this utility model.

Claims

1. A cryogenic wind tunnel control system, characterized in that: It includes a main control subsystem, which communicates with and connects to the monitoring and control subsystem, power control subsystem, refrigeration control subsystem, vacuum control subsystem, and spray control subsystem. The main control subsystem is used to control the start and stop of the monitoring and control subsystem, power control subsystem, refrigeration control subsystem, vacuum control subsystem, and spray control subsystem, and to adjust the working status of the other control subsystems based on the monitoring data of the monitoring and control subsystem. The power control subsystem controls the power unit to drive the gas circulation flow inside the wind tunnel; the refrigeration control subsystem controls the refrigeration unit to transfer cooling capacity into the wind tunnel; the vacuum control subsystem controls the vacuum simulation device to regulate the air pressure inside the wind tunnel; and the spray control subsystem controls the spray device to generate water mist.

2. The cryogenic wind tunnel control system according to claim 1, characterized in that: The main control subsystem sends test start signals to the power control subsystem, refrigeration control subsystem, vacuum control subsystem, and spray control subsystem. The monitoring and control subsystem monitors the real-time pressure, temperature, and wind speed inside the wind tunnel. When the pressure, temperature, and wind speed inside the wind tunnel reach the target values, the main control subsystem sends a test start signal. When the set test time ends, the main control subsystem sends a test stop signal, completing the wind tunnel operation test.

3. The cryogenic wind tunnel control system according to claim 2, characterized in that: The main control subsystem also includes a display device, which obtains the operating status and operating parameters of the other subsystems and displays them in real time through the display device.

4. The cryogenic wind tunnel control system according to claim 2, characterized in that: The power control subsystem receives the test start signal sent by the main control subsystem, turns on the power motor and frequency converter of the power unit, drives the fan to rotate and drive the air circulation in the wind tunnel; the monitoring and control subsystem monitors the wind speed in the wind tunnel, and the power control subsystem adjusts the working parameters of the frequency converter according to the wind speed requirements to make the wind speed in the test section reach the target value and remain stable.

5. The cryogenic wind tunnel control system according to claim 4, characterized in that: The power unit is located in the power section of the wind tunnel. The frequency converter is connected to the power motor, which in turn is connected to the fan. The frequency converter is communicatively connected to the power control subsystem. The power control subsystem receives commands from the main control subsystem and controls the start / stop and operating parameters of the frequency converter. The monitoring and control subsystem includes an absolute pressure sensor, which is installed in the test section and the stabilization section to measure the static pressure at the installation point and calculate the wind speed through the pressure difference. Based on the wind speed measured by the monitoring and control subsystem, the main control subsystem controls and adjusts the operating parameters of the frequency converter through the power control subsystem.

6. The cryogenic wind tunnel control system according to claim 2, characterized in that: The refrigeration control subsystem receives the test start signal sent by the main control subsystem, turns on the refrigeration device, and provides cooling medium to the heat exchanger in the wind tunnel. The cooling medium exchanges heat with the flowing air in the heat exchanger, and the circulating air carries away the heat of the cooling medium, thus cooling the air in the wind tunnel. The monitoring and control subsystem monitors the temperature in the wind tunnel in real time, and the refrigeration control subsystem controls and adjusts the operating parameters of the refrigeration device.

7. The cryogenic wind tunnel control system according to claim 6, characterized in that: The refrigeration device includes a buffer water tank and a refrigeration unit. The heat exchanger is connected to the tunnel structure through an air inlet channel and an air outlet channel. The heat exchanger is connected to the buffer water tank through a heat exchange water inlet pipe and a heat exchange water outlet pipe. The buffer water tank is connected to the refrigeration unit through a buffer water tank outlet pipe and a buffer water tank return pipe. Water pumps are installed on the heat exchange water inlet pipe and the buffer water tank return pipe. Electric valves are installed on the heat exchange water inlet pipe, the heat exchange water outlet pipe, the buffer water tank outlet pipe, and the buffer water tank return pipe. The cooling medium in the buffer water tank is transported to the heat exchanger, where it exchanges heat with the air. Then it returns to the buffer water tank, and the cycle continues. The heat of the cooling medium is carried away by the circulating air, thus cooling the air in the wind tunnel.

8. The cryogenic wind tunnel control system according to claim 2, characterized in that: The vacuum control subsystem receives the test start signal sent by the main control subsystem, turns on the vacuum unit of the vacuum simulation device, and the vacuum unit discharges the gas in the wind tunnel to the outside of the tunnel, reducing the air pressure in the wind tunnel to simulate the low-pressure environment at different altitudes. The monitoring and control subsystem monitors the air pressure in the wind tunnel in real time, and the vacuum control subsystem controls the working parameters of the vacuum unit to control the air pressure in the wind tunnel to reach the test target air pressure and keep it stable.

9. The cryogenic wind tunnel control system according to claim 8, characterized in that: The vacuum simulation device also includes a pressure regulation module, which controls the pumping rate and intake rate of the vacuum unit through control valves; the monitoring and control subsystem includes a pressure sensor, which is installed inside the cave structure to detect the real-time pressure inside the cave structure.

10. The cryogenic wind tunnel control system according to claim 2, characterized in that: The spray control subsystem receives the test start signal sent by the main control subsystem, activates the spray device in the wind tunnel test section, and controls the spray duration. The spray device includes a spray rake, which is composed of an array of multiple spray rods. A spray channel is set inside the spray rod, and a nozzle is set at the front end of the spray channel. The spray channel is connected to the spray water supply module through a spray water pipe and to the spray air supply module through a spray air pipe. A heat-insulating water pipe is also set side by side next to the spray water pipe, which is connected to the heating module. The spray water pipe and spray air pipe of each spray rod are controlled by a solenoid valve. The spray control subsystem can individually control the opening and closing of the solenoid valve of each spray water pipe and spray air pipe to regulate the spray volume. A humidity sensor is installed in the wind tunnel to measure the humidity inside the wind tunnel.

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