Combined suction system for improving periodicity of planar cascade and quality of outlet flow field

Abstract

The invention provides a combined suction system for improving the periodicity of a planar cascade and the quality of an outlet flow field. The combined suction system comprises an upper end wall suction cavity, a left turntable, a left turntable slideway, a cascade wind tunnel experiment table, a cascade wind tunnel experiment table fixing seat, a right turntable and a right turntable slideway. In the system, symmetric suction is conducted through the left grid plate and the right grid plate, symmetric suction is conducted through the front boundary layer structure of the left grid plate andthe right grid plate, the suction device arranged on the blade grid is controlled through the throttle valve, and control over the periodicity and the dense flow ratio of a flow field in the blade grid is achieved; according to the requirements of different blade grids. the number and the relative positions of the suction holes formed in the left grid plate and the right grid plate are adjusted, and the control effect of the periodicity and the dense flow ratio of a blade grid outlet flow field is achieved more efficiently in an energy-saving mode.

Description

technical field [0001] The invention relates to the technical field of impeller machinery, and in particular relates to a combined suction system for improving the periodicity of a plane cascade and the quality of an outlet flow field. Background technique [0002] The planar cascade test is the basic test for the verification of the new airfoil design method, and the test results can be directly used as the basis for evaluating and improving the aerodynamic performance of the airfoil. In the basic research of compressor performance, the wind tunnel test research of plane cascade occupies an extremely important position. During the test of the plane cascade of the aeroengine, ensuring the inherent periodic characteristics between the flow channels of the cascade is one of the important technical requirements to ensure the validity and reliability of the test data of the cascade. [0003] Through the flat cascade wind tunnel experiment, the aerodynamic performance of the air...

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Problems solved by technology

[0005] According to the existing structure proposed above, when the left and right grids are sucked, because they are directly connected to the suction pump, it is easy to cause asymmetrical suction capacity on the left and right, and the suction flow cannot be predicted, which will affect the internal flow field structure of the cascade; due to the existing The positions of the suction holes / slots of the grid plate are fixed, and the suction capacity cannot be adjusted according to the specific conditions under different attack angles; the existing suction structure does not arrange suction on the upper end wall, because the upper and lower end walls The influence of the development of the layer, seriously affects the periodicity of the flow field at the outlet of the plane cascade, and the influence on the periodicity of the flow field is different under different angles of attack, which seriously affects the accuracy of the experimental results; the existing boundary layer suction form is distance At the position far from the front edge of the cascade inlet, a large suction back pressure is required to realize the suction of the boundary layer. At the same time, due to the asymmetrical suction capabilities of the left and right boundary layers, the technical problem of symmetrical suction cannot be guaranteed. To provide a combined suction system for improving the periodicity of the planar cascade and the quality of the outlet flow field

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