Plane cascade wind tunnel outlet section back pressure adjusting device

Abstract

The invention discloses a plane cascade wind tunnel outlet section back pressure adjusting device. A pressure box, an upper diffusion plate and a lower diffusion plate are all arranged at the downstream of the plane cascade and form the wind tunnel outlet section of the plane cascade, and an upper supporting part is fixedly arranged on the upper surface of the pressure box or the upper diffusion plate; the upper end of the upper supporting part is connected to the upper wall of the wind tunnel in an up-down adjustable mode, the lower supporting part is fixedly arranged on the lower surface of the lower diffusion plate, the lower end of the lower supporting part is connected to the lower wall of the wind tunnel in an up-down adjustable mode, and the lower surface of the upper diffusion plate is movably connected with an angle-adjustable throttling plate. Through adjusting the opening angle of the throttling plate, the outlet flow area of the plane cascade can be changed, and the back pressure of the wind tunnel outlet section of the plane cascade is further adjusted; the lower wall of the pressure box is of a porous structure, the interior of the pressure box is of a cavity structure, and the pressure box is used for sucking low-speed fluid on the lower wall face, restraining boundary layer development, improving the through-flow capacity, improving the periodicity of a cascade outlet and improving the flow quality of a wind tunnel.

Description

technical field [0001] The invention belongs to the field of turbomachinery wind tunnel tests, and more specifically relates to a back pressure adjustment device for the outlet section of a plane cascade wind tunnel, which uses adjustable components and mechanisms to realize continuous adjustment of the back pressure of the outlet section of a plane cascade wind tunnel. Adjustment, and can improve the periodicity of the flow at the outlet section of the plane cascade wind tunnel. The back pressure adjustment device at the outlet section of the plane cascade wind tunnel designed by the present invention has the technical advantages of simple use, obvious effect, good versatility, and low cost. Background technique [0002] In the basic research and design of aeroengine blades, the method of plane cascade test is generally used for measurement and verification, and the performance of the cascade directly affects the performance index of the aeroengine. It has become an importa...

AI Technical Summary

Problems solved by technology

The outlet section of the cascade can be designed in an open manner, connected to a vacuum box, etc. The open design cannot adjust the back pressure, while the vacuum box can adjust the back pressure, but the processing and use costs are high

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