Shock position regulating device and method based on shock wave gas film cooling interference theory

Abstract

The application discloses a shock wave position regulating device and method based on a shock wave gas film cooling interference theory, which comprises a shock wave generating device, a controller, an interference point pressure monitoring pipeline, a position regulating device, a protected wall surface and a cold gas pipeline; when a flow field is influenced by uneven incoming flow, cold gas working condition change, other shock wave interference and other factors, the position of the interference between the shock wave and the wall surface will change and the position of the interference point cannot be accurately predicted in advance; according to the interference theory of the shock wave and the gas film cooling, the position of the shock wave generating device in the flow direction can be adjusted autonomously to realize the adjustment of the interference point of the shock wave and the gas film cooling, and the automatic positioning function can be achieved under different working conditions, and the device can be used in scenes such as fixed-point flow measurement or fixed-point flow field test related to the shock wave under the supersonic condition.

Claims

1. A shock wave position control device based on shock wave film cooling interference theory, characterized in that, Includes shock wave generator (2), controller (4), interference point pressure monitoring pipeline (5), position control device (7), protected wall (8), and cold air pipeline (9); for the flow channel of the target test section, high temperature mainstream (1) is introduced into the flow channel, and cold air pipeline (9) is used to introduce cold gas (3) into the flow channel to perform gas film cooling on the protected wall (8); Among them, the shock wave generating device (2) is equipped with a position control device, both located inside the flow channel. The shock wave generating device (2) is used to generate a shock wave (6) at a preset angle. The inner wall of the flow channel is a protected wall surface (8). The controller (4) connects the interference point pressure monitoring pipe (5) and the position control device (7). The interference point pressure monitoring pipe (5) is connected to the flow channel to collect the flow channel pressure signal and send it to the controller (4). The controller (4) analyzes the flow channel pressure signal and sends a corresponding command to the position control device (7). The position control device (7) controls the position of the shock wave generating device (2). Based on the shock wave position control device, the following steps S1-S9 are executed to complete the fixed-point flow measurement of shock wave and film cooling interference under different operating conditions: Step S1: Under given operating conditions, determine the initial parameters related to the test, including the Mach number Ma of the incoming flow of the high-temperature mainstream (1), the angle δ of the shock wave generator (2), the shock wave angle β generated by the shock wave generator (2), the height H of the shock wave generator (2) from the protected wall (8), and the initial distance L0 of the shock wave generator (2) from the interference point pressure monitoring pipe (5). Step S2: The controller (4) sends a command to the position control device (7) to move the shock wave generator (2) so that the distance between the shock wave generator (2) and the interference point pressure monitoring pipe (5) is L=L0, the test is started, and the average pressure in the interference point pressure monitoring pipe (5) at this time is recorded as P0. Step S3: Move the shock wave generator (2) to the right by a distance Δx, and record the average pressure in the interference point pressure monitoring pipe (5) at this time as P1; Step S4: Preset pressure threshold m, if If so, move the shock wave generator (2) to the left by a distance Δx, and jump to step S9; if ,and Proceed to step S5; if ,and Proceed to step S7; Step S5: Move the shock wave generator (2) to the right by a distance Δx, and record the average pressure in the interference point pressure monitoring pipe (5) at this time as P2; Step S6: If Then assign a value And jump to step S5; if Then move the shock wave generator (2) to the left by a distance Δx / 2 and jump to step S9; Step S7: Move the shock wave generator (2) to the left by a distance Δx, and record the average pressure in the interference point pressure monitoring pipe (5) at this time as P2; Step S8: If Then assign a value And jump to step S7; if Then move the shock wave generator (2) to the left by a distance Δx / 2 and jump to step S9; Step S9: Regulation ends.

2. The shock wave position control device based on shock wave film cooling interference theory according to claim 1, characterized in that, The cold air pipe (9) is a branch of the flow channel. It is connected to the flow channel at a preset angle and communicates with the inside of the flow channel to introduce the cold air gas (3) into the flow channel.

3. The shock wave position control device based on shock wave film cooling interference theory according to claim 1, characterized in that, The cold air pipe (9) is placed inside the flow channel to introduce the cold air gas (3) into the flow channel.

4. The shock wave position control device based on shock wave film cooling interference theory according to claim 1, characterized in that, It also includes a suction pipe (10), which is connected to the flow channel and communicates with the inside of the flow channel, and is used to guide the suction gas (11) from the inside of the flow channel to the outside of the flow channel.

5. The shock wave position control device based on shock wave film cooling interference theory according to claim 1, characterized in that, It also includes step S10: judging whether flow separation is caused by the pressure of the interference point pressure monitoring pipe (5). If separation occurs, the boundary layer is pumped through the suction pipe (10).

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