Supersonic plane cascade flow field starting and uniformity adjusting device

Abstract

The invention discloses a supersonic plane cascade flow field starting and uniformity adjusting device. The adjusting device takes the incoming flow of a cascade wind tunnel as the front and comprises an upper suction assembly arranged above a first blade of a cascade test model, an upper tail plate with a fixed front end and a suspended rear end is arranged behind the upper suction assembly, and an upper baffle with a fixed front end and a suspended rear end is arranged behind the first blade; the device further comprises a lower suction assembly installed below a tail blade of the cascade test model, a lower tail plate with a fixed front end and a suspended rear end is installed behind the lower suction assembly, and a lower baffle with a fixed front end and a suspended rear end is installed behind the tail blade. The adjusting device can stabilize the mass flow of the drainage channel in the suction test section, provide a stable drainage channel shock wave structure in a local low-pressure environment, regulate and control the pressure distribution condition in front of the grid, and achieve starting and uniformity adjustment of a supersonic flow field.

Description

technical field [0001] The invention belongs to the field of aero-engine integrated research and test equipment, and in particular relates to a supersonic planar cascade flow field start-up and uniformity adjustment device. Background technique [0002] The replacement and development of aero-engines has continuously promoted the advancement of aero-turbine design technology. Among them, the relative Mach number of the tip of the fan and compressor rotor blades and the Mach number of the turbine blade outlet have exceeded the speed of sound, and some aerodynamic design schemes have reached the Mach number above 1.5. The emergence of supersonic shock waves has introduced a major problem to the aerodynamic design of components. It is not only necessary to make full use of the supercharging effect of the shock waves to effectively increase the pressure, but also to effectively organize the shock wave structure to avoid the shock wave from interacting with the blade boundary laye...

AI Technical Summary

Problems solved by technology

[0004] At present, due to the relative scarcity of supersonic planar cascade test platforms, the development of supersonic compressor planar cascade tests with incoming flow is limited, and it is even more difficult to effectively adjust the supersonic incoming flow conditions.

In fact, due to the very small installation angle of the supersonic compressor cascade test piece, after entering the test section area, the blockage degree of the model at the same axial position is very different; at the same time, due to the shock wave system in front of the cascade, the / oblique shock wave, there will be shock loss and deflection of airflow angle, which will directly lead to a great difference in the flow conditions of the front and rear blades of the test piece; because the supersonic flow field is extremely sensitive to the flow state of the upper and lower discharge holes of the test piece, Whether the shock wave system of the discharge channel is in the channel or in the state of the bow shock wave directly affects the shock wave system structure of the first blade in the test section and affects the subsequent series of blades; whether there is reflection at the front end of the first blade affects most of the blades. Channel start-up problem

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