Separation test system and method based on high Mach number wind tunnel high blockage test piece

Abstract

A separation test system and method for a high-Mach number wind tunnel with a high degree of congestion test piece is described. A pressure measurement point within the wind tunnel chamber measures the wind tunnel chamber pressure and feeds the pressure value back to a pressure acquisition system. A test piece is mounted on an angle-of-attack mechanism, and a separation and unlocking device is provided on the test piece. The pressure acquisition system is connected to the pressure measurement point and the separation and unlocking device control system. The pressure acquisition system receives the pressure value and determines whether the pressure value meets the unlocking condition. When the unlocking condition is met, an unlocking signal is sent to the separation and unlocking device control system. The separation and unlocking device control system is connected to the separation and unlocking device and sends an unlocking signal to the separation and unlocking device. The separation and unlocking device receives the unlocking signal and controls the separation and unlocking device to perform the separation and unlocking action. The separation and unlocking action is completed when the wind tunnel reaches the test pressure. The present invention can complete the test piece unlocking and separation action under the optimal high Mach number condition for a short period of time.

Description

Technical Field

[0001] The present invention relates to the technical field of dynamic aerodynamics testing, and in particular to a separation testing system and method based on a high-Mach number wind tunnel high-blockage test piece. Background Art

[0002] For high-Mach number wind tunnels with Mach numbers greater than 3, the blockage of the test model generally does not exceed 10% (the percentage of the projected area of ​​the model on the wind tunnel nozzle outlet cross-section to the nozzle outlet cross-sectional area) to ensure the long-term stable establishment of the high-Mach number flow field, thereby ensuring reliable data acquisition. To ensure blockage, a scaled-down model is generally used. For large-scale ground separation tests based on the aerodynamic separation principle, the test must be carried out under high-Mach number inflow conditions. The purpose of the test is not only to verify the aerodynamic separation principle, but also to confirm the working performance of each system product under the actual installation structure and the reliability of the separation action. Therefore, 1:1 real-size products must be used for testing. Due to the large size of the test product, its blockage may reach more than 20%. Such test products are classified as high-blockage test pieces. This makes it impossible for high-Mach number wind tunnels to establish a stable flow field for a long time, greatly compressing the available effective test time. Summary of the Invention

[0003] In response to the high blockage problem of wind tunnels caused by large-scale separation test products, the present invention proposes a separation test system and method based on high-Mach number wind tunnel high-blockage test pieces to solve the technical problem of conducting effective tests under short-term stable flow field conditions in high-Mach number wind tunnel tests of real-scale products.

[0004] The present invention proposes a separation test system based on a high-Mach number wind tunnel with a high-clogging test piece, comprising: a wind tunnel stagnation chamber, a wind tunnel nozzle, a wind tunnel rear section, a separation unlocking device, an angle of attack mechanism, a pressure acquisition system, a separation unlocking device control system, and a wind tunnel operation control system;

[0005] The wind tunnel chamber is connected to one end of the wind tunnel nozzle, and the other end of the wind tunnel nozzle is connected to the rear section of the wind tunnel to form a wind tunnel. A pressure measuring point is provided in the wind tunnel chamber, and the pressure measuring point is used to measure the pressure in the wind tunnel chamber and feed the pressure value back to the pressure acquisition system.

[0006] The angle of attack mechanism is installed inside the rear section of the wind tunnel, a test piece is installed on the angle of attack mechanism, and a separation and unlocking device is installed on the test piece;

[0007] The pressure acquisition system is connected to the pressure measuring point and the separation and unlocking device control system, the pressure acquisition system receives the pressure value and determines whether the pressure value meets the unlocking condition, and when the unlocking condition is met, sends an unlocking signal to the separation and unlocking device control system;

[0008] The separation unlocking device control system is connected to the separation unlocking device and sends an unlocking signal to the separation unlocking device, and the separation unlocking device receives the unlocking signal and performs a separation unlocking action, and the separation unlocking action is completed when the wind tunnel station chamber reaches the test pressure;

[0009] The wind tunnel operation control system controls the wind tunnel operation.

[0010] Furthermore, the determination of whether the pressure value satisfies the unlocking condition is specifically as follows: when the pressure acquisition system determines that the pressure value reaches the set threshold value P 02 After that, an unlocking signal is sent to the control system of the separation unlocking device;

[0011] When the pressure acquisition system determines that the pressure value reaches the test pressure P 01 The experimental feasibility conditions are met when P 01 >P 02 .

[0012] Furthermore, the separation and unlocking device receives the unlocking signal and controls the separation and unlocking device to perform a separation and unlocking action, specifically including:

[0013] After receiving the unlocking signal, the separation unlocking device control system sends a separation ignition command to the separation unlocking device, and the separation unlocking device starts to unlock. When the unlocking is completed, the pressure in the wind tunnel is the test pressure P 01 After unlocking, the release unlocking device immediately starts the separation action. When the separation action is completed, the pressure in the wind tunnel is the test pressure P 01 .

[0014] Furthermore, after the separation and unlocking device completes the separation action, the wind tunnel operation control system immediately issues a wind tunnel stop operation instruction.

[0015] Furthermore, the system includes a flow field image acquisition system, which is arranged inside the wind tunnel and collects test flow field images in the wind tunnel.

[0016] The present invention also provides a test method for a separation test system, comprising:

[0017] Measure the stagnation pressure in the wind tunnel chamber to obtain the pressure value;

[0018] Determining whether the pressure value satisfies an unlocking condition, and sending an unlocking signal when the unlocking condition is satisfied;

[0019] The separation and unlocking device receives the unlocking signal and performs a separation and unlocking action, and completes the separation and unlocking action when the wind tunnel reaches the test pressure.

[0020] Furthermore, the determination of whether the pressure value satisfies the unlocking condition is specifically as follows:

[0021] The pressure value of the wind tunnel chamber is measured in real time; when the pressure value of the wind tunnel chamber reaches the set threshold value P 02 After that, an unlock signal is issued;

[0022] Determine whether the pressure value of the wind tunnel station chamber reaches the test pressure P 01 The experimental feasibility conditions are met when P 01 >P 02 .

[0023] Furthermore, the separation unlocking device performs the separation unlocking action, specifically including: after receiving the unlocking signal, the separation unlocking device starts to unlock, and the pressure value in the wind tunnel at the time of unlocking is the test pressure P 01 After unlocking, the release unlocking device immediately starts the separation action. When the separation action is completed, the pressure in the wind tunnel is the test pressure P 01 .

[0024] Furthermore, after the separation unlocking device completes the separation process, the wind tunnel stops running.

[0025] The present invention provides a test method for a separation test system, comprising:

[0026] The flow field image acquisition system, the pressure acquisition system and the pressure measuring points are started, and the wind tunnel begins to operate; the pressure in the wind tunnel chamber is measured using the pressure measuring points and the pressure value is fed back to the pressure acquisition system;

[0027] When the pressure acquisition system determines that the pressure value reaches the set threshold value P 02 After that, a separation signal is sent to the separation unlocking device control system;

[0028] After receiving the separation signal, the separation unlocking device control system sends a separation command to the separation unlocking device. The separation unlocking device starts to unlock first. The moment of unlocking is when the wind tunnel chamber pressure value is P 01 After unlocking, the separation unlocking device immediately starts the separation action, and the separation action is completed when the wind tunnel chamber pressure value is P 01 The pressure value P of the wind tunnel station chamber during the time period 01 Satisfy the experimental feasibility conditions, where P 01 >P 02 ;

[0029] After the separation unlocking device completes the separation action, the wind tunnel operation control system immediately issues a wind tunnel stop operation instruction.

[0030] This invention effectively provides a method for conducting separation tests under high-Mach number and high-congestion conditions in high-Mach number wind tunnels. Based on the flow characteristics and time history of a high-congestion flow field established in a high-speed wind tunnel, this method rationally selects the wind tunnel stagnation pressure as a feedback parameter. Furthermore, by designing the test sequence based on characteristics such as signal transmission time and the time from wind tunnel startup to flow field establishment, it is possible to implement and complete the separation action under optimal conditions at high Mach numbers in a short period of time. This method achieves the objectives of verifying the test principle, acquiring data, and evaluating product performance, and provides a reference for the effective implementation of high-congestion tests in high-Mach number wind tunnels. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a structural diagram of a separation test system based on a high-Mach number wind tunnel high-blockage test piece according to the present invention;

[0032] Figure 2 It is a separation test timing diagram of the present invention;

[0033] Figure 3 It is a schematic diagram of the results of the separation test of the present invention. DETAILED DESCRIPTION

[0034] The present invention provides a separation test system and method based on a high-Mach number wind tunnel high-clogging test piece.

[0035] Reference Figure 1 The separation test system of the present invention based on the high Mach number wind tunnel high blockage test piece includes: a wind tunnel chamber, a wind tunnel nozzle, a wind tunnel rear section, a separation unlocking device, an angle of attack mechanism, a pressure acquisition system, a separation unlocking device control system, a flow field image acquisition system, and a wind tunnel operation control system.

[0036] The wind tunnel chamber is connected to one end of the wind tunnel nozzle, and the other end of the wind tunnel nozzle is connected to the rear section of the wind tunnel to form a wind tunnel. The wind tunnel chamber is provided with a pressure measuring point, which is used to measure the pressure of the wind tunnel chamber and feed the pressure value back to the pressure acquisition system.

[0037] The angle of attack mechanism is inside the rear section of the wind tunnel, and a test piece is installed on the angle of attack mechanism, and the test piece is provided with a separation and unlocking device.

[0038] The pressure acquisition system is connected to each pressure measuring point and the separation unlocking device control system. The pressure acquisition system receives the pressure value and determines whether the pressure value meets the unlocking condition. When the unlocking condition is met, the system sends an unlocking signal to the separation unlocking device control system.

[0039] The separation unlocking device control system is connected to the separation unlocking device and sends an unlocking signal to the separation unlocking device. The separation unlocking device receives the unlocking signal and controls the separation unlocking device to perform the separation unlocking action. The separation unlocking action is completed when the wind tunnel reaches the test pressure.

[0040] The wind tunnel operation control system controls the angle of attack mechanism and controls the wind tunnel operation.

[0041] The flow field image acquisition system is located inside the rear section of the wind tunnel and collects test flow field images inside the rear section of the wind tunnel.

[0042] Before the wind tunnel is put into operation, the flow field image acquisition system, pressure acquisition system and pressure measuring point are started to measure the pressure value of the wind tunnel resident chamber in real time. When the pressure acquisition system determines that the pressure value of the wind tunnel resident chamber reaches the set threshold value P 02 After that, an unlocking signal is sent to the control system of the separation unlocking device. When the pressure acquisition system determines that the pressure value of the wind tunnel station chamber reaches the test pressure P 01 The experimental feasibility conditions are met when P 01 >P 02 Here, P 01 、P 02 are the pressures inside the room. 01 is the set total pressure, that is, the target pressure to be achieved, in P 01 The wind tunnel test can only be carried out under pressure. 01 There needs to be a process in which a threshold P is set 02 , P 02 Lower than P 01 . Real-time pressure monitoring is performed during the rising process of the stationary chamber pressure. When the stationary chamber pressure reaches P 02 When the unlocking signal is sent according to the test sequence requirements, the unlocking and separation action has a process, and the pressure continues to rise to P 01 After that, the unlocking action is just completed and the separation action begins.

[0043] After receiving the unlocking signal, the separation unlocking device control system sends a separation ignition command to the separation unlocking device, causing the separation unlocking device to begin unlocking. The moment when the unlocking is completed is within the flow field stability period in the wind tunnel. After unlocking, the separation unlocking device immediately begins the separation action. The moment when the separation unlocking device completes the separation action is within the flow field stability period in the wind tunnel. After the separation unlocking device completes the separation action, the wind tunnel operation control system immediately sends a wind tunnel stop operation command. The present invention also provides a test method for a separation test system, comprising:

[0044] At △t1 time before the wind tunnel is put into operation, the flow field image acquisition system, pressure acquisition system and pressure measurement point are started to measure the pressure in the chamber in real time; the wind tunnel is put into operation and reaches the feasible total pressure state P 01 .

[0045] When the pressure acquisition system determines that the chamber pressure reaches the set threshold value P 02 After that, a separation signal is sent to the separation unlocking device control system.

[0046] After receiving the separation signal, the separation unlocking device control system sends a separation ignition command to the separation unlocking device, and the separation unlocking device starts to unlock. The moment when the unlocking is completed is within the flow field stable time period Δt3 in the wind tunnel. After unlocking, the separation unlocking device immediately starts the separation action. The moment when the separation unlocking device completes the separation action is within the flow field stable time period Δt3 in the wind tunnel.

[0047] After the separation unlocking device completes the separation process, the wind tunnel operation control system immediately issues a wind tunnel stop operation instruction.

[0048] The present invention also provides a separation test method, comprising: measuring the stagnation chamber pressure of the wind tunnel to obtain a pressure value;

[0049] Determine whether the pressure value meets the unlocking condition. When the unlocking condition is met, send an unlocking signal; the separation unlocking device performs the separation unlocking action according to the unlocking signal, and completes the separation unlocking action when the wind tunnel reaches the test pressure.

[0050] Furthermore, the wind tunnel chamber pressure value is measured in real time; when the wind tunnel chamber pressure value reaches the set threshold value P 02 After that, an unlocking signal is issued. It is judged that the pressure value of the wind tunnel station chamber reaches the test pressure P 01 The experimental feasibility conditions are met when P 01 >P 02 .

[0051] Furthermore, after receiving the unlocking signal, the separation unlocking device starts to unlock. When the unlocking is completed, the pressure in the wind tunnel is the test pressure P 01 After unlocking, the release unlocking device immediately starts the separation action. When the separation action is completed, the pressure in the wind tunnel is the test pressure P 01 .

[0052] Furthermore, after the separation unlocking device completes the separation process, the air outlet tunnel stops operating.

[0053] Example

[0054] In order to solve the problem of the inability to establish a stable flow field for a long time due to the high blockage of the super wind tunnel, Figure 2 , the separation test implementation method of the present invention is as follows:

[0055] (1) Taking the total pressure of the wind tunnel under the experimental design state as the benchmark, wind tunnel operation tests under different total pressure states were carried out. The influence of the total pressure change on the flow field stability establishment time was analyzed based on the flow field image characteristics. The total pressure state where the flow field stability establishment time △t3 can cover the separation action time △t7 was selected as the feasible total pressure state P for the experiment. 01 , at this time the flow field state is stable.

[0056] (2) The principles for determining the usable range of the flow field generally include: the flow field should have a clear shock wave structure; the flow field should not fade downstream; and the dynamic pressure, static pressure and other parameters of the test section calculated based on the total pressure should be close to the test requirements and change relatively slowly.

[0057] (3) According to the total pressure state P 01 Carry out the test, test equipment and system connection relationship see Figure 1 .

[0058] (4) Before the wind tunnel starts running, the flow field image and resident pressure measurement acquisition system is turned on at △t1 time; the resident pressure measurement results are judged in real time; after the wind tunnel starts running, when the measurement system judges that the resident pressure reaches the set threshold value P 02 After that, a separation signal is automatically sent to the separation unlocking device control system. If the measured chamber pressure value does not exceed the set threshold, no separation signal is sent; the time from collecting the chamber pressure measurement value signal to issuing the command is △t5.

[0059] (5) After the separation unlocking device control system receives the feedback signal from the chamber pressure measurement and acquisition system, it issues a separation / ignition command to the separation unlocking device on the test piece, and the separation unlocking device then completes the unlocking and separation action. The time from receiving the feedback signal to completing the unlocking action is Δt6, where Δt6 is the sum of the time when the separation unlocking device control system issues the unlocking signal to the separation unlocking device and the time when the separation unlocking device opens the lock. Δt5 and Δt6 are connected. Separation begins immediately after unlocking is completed, and the time from the start of separation to the completion of separation is Δt7.

[0060] (6) It is necessary to confirm the time length and deviation of △t5 and △t6, and design the chamber pressure threshold accordingly to ensure that the unlocking action is completed after the flow field is stabilized, and the test piece separation process △t7 is completely within the flow field stable section △t3, thereby ensuring that the high Mach number flow field simulation is realistic and the data results are valid; the separation unlocking device issues the separation / ignition command before or after the stable flow field is established; reference Figure 2 The unlocking action completion time △t6 should be within the flow field stability time period, and the separation action should be completed within the flow field stable state, that is, the separation completion time △t7 should be within the flow field stable section △t3. As long as this condition is met, the time of issuing the separation / ignition command can be before or after the time of establishing the stable flow field.

[0061] (7) After the test piece separation action is completed, the flow field enters an unstable range and the data results are unavailable. To avoid damage to the test piece, the total wind tunnel operation time △t4 is reasonably designed. The longer the wind tunnel operation time △t4 is, the greater the airflow impact at the end of the operation, and the greater the risk of product damage. The wind tunnel stop operation command is issued as soon as possible after the separation action is completed.

[0062] Experimental results show opinions Figure 3 , separation action implementation time, test section dynamic pressure total pressure state P 01 Controlled within the range of 5500Pa-6000Pa, this magnitude of change does not affect the test conclusion and meets the test verification requirements.

Claims

1. A separation test system based on a high Mach number wind tunnel with high congestion test pieces, characterized in that: include: Wind tunnel chamber, wind tunnel nozzle, wind tunnel rear section, separation and unlocking device, angle of attack mechanism, pressure acquisition system, separation and unlocking device control system; The wind tunnel chamber is connected to one end of the wind tunnel nozzle, and the other end of the wind tunnel nozzle is connected to the rear section of the wind tunnel. A pressure measuring point is provided in the wind tunnel chamber, and the pressure measuring point is used to measure the pressure in the wind tunnel chamber and feed the pressure value back to the pressure acquisition system; The angle of attack mechanism is installed inside the rear section of the wind tunnel, a test piece is installed on the angle of attack mechanism, and a separation and unlocking device is installed on the test piece; The pressure acquisition system receives the pressure value and determines whether the pressure value meets the unlocking condition, and when the unlocking condition is met, sends an unlocking signal to the separation unlocking device control system; The separation unlocking device control system is connected to the separation unlocking device and sends an unlocking signal to the separation unlocking device. The separation unlocking device receives the unlocking signal and performs a separation unlocking action. The separation unlocking action is completed when the wind tunnel residence chamber reaches the test pressure. The wind tunnel operation control system controls the operation of the wind tunnel. The specific method for determining whether the pressure value satisfies the unlocking condition is: When the pressure acquisition system determines that the pressure value reaches the set threshold value P 02 After that, an unlocking signal is sent to the control system of the separation unlocking device; When the pressure acquisition system determines that the pressure value reaches the test pressure P 01 The experimental feasibility conditions are met when P 01 >P 02 ; The separation unlocking device receives the unlocking signal and controls the separation unlocking device to perform a separation unlocking action, specifically including: After receiving the unlocking signal, the separation unlocking device control system sends a separation ignition command to the separation unlocking device, and the separation unlocking device starts to unlock. When the unlocking is completed, the pressure in the wind tunnel is the test pressure P 01 After unlocking, the release unlocking device immediately starts the separation action. When the separation action is completed, the pressure in the wind tunnel is the test pressure P 01 ; After the separation and unlocking device completes the separation action, the wind tunnel operation control system immediately issues a wind tunnel stop operation instruction.

2. The system according to claim 1, wherein: The system comprises a flow field image acquisition system, which is arranged inside the wind tunnel and collects test flow field images in the wind tunnel.

3. A test method for a separation test system, characterized in that: include: Measure the stagnation pressure in the wind tunnel chamber to obtain the pressure value; Determining whether the pressure value satisfies an unlocking condition, and sending an unlocking signal when the unlocking condition is satisfied; The separation and unlocking device receives the unlocking signal and performs a separation and unlocking action, and completes the separation and unlocking action when the wind tunnel reaches the test pressure; The specific method for determining whether the pressure value satisfies the unlocking condition is: The pressure value of the wind tunnel chamber is measured in real time; when the pressure value of the wind tunnel chamber reaches the set threshold value P 02 After that, an unlock signal is issued; Determine whether the pressure value of the wind tunnel station chamber reaches the test pressure P 01 The experimental feasibility conditions are met when P 01 >P 02 ; The separation and unlocking device performs the separation and unlocking action, specifically including: After receiving the unlocking signal, the separation unlocking device starts to unlock. When the unlocking is completed, the pressure in the wind tunnel is the test pressure P 01 After unlocking, the release unlocking device immediately starts the separation action. When the separation action is completed, the pressure in the wind tunnel is the test pressure P 01 ; After the separation unlocking device completes the separation process, the wind tunnel stops running.

4. A test method based on the separation test system according to claim 2, characterized in that: include: The flow field image acquisition system, the pressure acquisition system and the pressure measuring points are started, and the wind tunnel begins to operate; the pressure in the wind tunnel chamber is measured using the pressure measuring points and the pressure value is fed back to the pressure acquisition system; When the pressure acquisition system determines that the pressure value reaches the set threshold value P 02 After that, a separation signal is sent to the separation unlocking device control system; After receiving the separation signal, the separation unlocking device control system sends a separation command to the separation unlocking device. The separation unlocking device starts to unlock first. The moment of unlocking is when the wind tunnel chamber pressure value is P 01 After unlocking, the separation unlocking device immediately starts the separation action, and the separation action is completed when the wind tunnel chamber pressure value is P 01 The pressure value P of the wind tunnel station chamber during the time period 01 Satisfy the experimental feasibility conditions, where P 01 >P 02 ; After the separation unlocking device completes the separation action, the wind tunnel operation control system immediately issues a wind tunnel stop operation instruction.

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