Self-starting test method of shock tunnel inlet

Abstract

The invention provides a pneumatic revolving door device for the self-starting test exit of the inlet of the shock tunnel, and a method for taking high-speed photography of the action history of the pneumatic revolving door for the self-starting test of the inlet of the shock tunnel by using the device, and performing shock The throttling method for the self-starting test of the air inlet in the wind tunnel includes: a door panel located at the outlet end of the air inlet, the door panel is rotatably connected to the rotating shaft through a bushing, the rotating shaft is fixed below the outlet end of the air inlet, and the lower edge of the door panel is vertical Connect the limit steps, the angle between the inclined door panel and the outlet end face of the air inlet is 3‑5°, after the flow field in the wind tunnel is stable, the pneumatic revolving door is opened by the airflow to rotate around the shaft to start the air inlet; The invention can conveniently perform effective automatic throttling control on the self-starting test of the inlet in the shock wave wind tunnel, and provides reliable test basis for mastering the flow control law of the inlet and the design of the hypersonic inlet.

Description

technical field [0001] The invention belongs to the technical field of experimental aerodynamics, and relates to a self-starting test method of a shock tunnel inlet, which relates to a pneumatic revolving door device and an action history of a pneumatic revolving door at the exit of a shock tunnel inlet self-starting test The method of high-speed photography, the throttling method of the self-starting test of the shock tunnel inlet. Background technique [0002] The intake port is the first aerodynamic component of the scramjet engine, and its performance will directly affect the working characteristics of the power system. The self-starting and stable operation of the intake port is the prerequisite for the normal operation of the power system. If the intake port does not start, the combustion chamber will not work normally, and the power system will not be able to generate the power it should. Therefore, the self-starting performance is one of the key aerodynamic performa...

AI Technical Summary

Problems solved by technology

[0009] ① Equipped with power throttling cone technology, the running time of the motor that pushes the throttling cone forward or backward, the running time of the guide rail slider mechanism or the screw nut mechanism is much longer than the test time of the shock wave tunnel, so it cannot be used for shock wave wind Self-starting test throttling of the intake port of the hole

It has been popularized and used in temporary wind tunnels, but it is possible to use it in shock wave wind tunnels after a lot of additional research is required on synchronous control and response speed

[0011] ③Preset lightweight block technology, it is difficult to control the quality of preset block

One is that if the mass is too light, it will easily cause the block to be blown away by the airflow from the intake duct when the flow field in the wind tunnel is not stable, and the throttling effect of the intake duct will not be achieved, so the throttling test will fail; The air flow in the stable flow field of the hole cannot blow away the blockage, causing the inlet port to fail to start and the inlet port throttling test to fail

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