Asymmetrical wedge-shaped vortex generator applied to flow control over compressor cascade and design method thereof

Abstract

The invention provides an asymmetrical wedge-shaped vortex generator applied to flow control over a compressor cascade and a design method thereof. The structure of the wedge-shaped vortex generator is redesigned, the dimension of the vortex generator which controls the branch side of a suction surface is decreased as far as possible, so that the form drag loss and the gas flow separation on the suction surface side are effectively reduced, and the problem that the capacity of lowering the flow loss of a compressor of the wedge-shaped vortex generator is not high is solved. The asymmetrical wedge-shaped vortex generator is introduced, so that suction surface vortexes and pressure surface vortexes are induced to be generated, the structure and transverse flowing of channel vortexes are changed through low-energy fluid rolling an adsorption side layer, gas flow separation on the suction surface / an end wall corner area is reduced, and therefore the total pressure loss of the compressor cascade is lowered.

Description

technical field [0001] The invention relates to the technical field of flow control of an axial-flow compressor cascade, in particular to an asymmetric wedge-shaped vortex generator applied to the flow control of a compressor cascade and a design method thereof. Background technique [0002] Under the requirement of high thrust-to-weight ratio of aero-engine, the compressor develops in the direction of high load. However, high loads are bound to be accompanied by large reverse pressure gradients and lateral pressure differences, which will lead to the accumulation of low-energy fluid in the boundary layer towards the blade suction surface / root, resulting in large-area corner separation and blockage of blade passages, especially in non-design conditions In this case, it is easy to cause the rotation stall or surge of the compressor. For this reason, a variety of control methods to suppress corner separation have emerged, such as end wall molding, vortex generators, boundary ...

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Problems solved by technology

[0003] In order to solve the problem that the existing wedge-shaped vortex generator cannot effectively reduce the flow loss of the compressor due to the unreasonable structure, the present invention proposes an asymmetric wedge-shaped vortex generator and its design method applied to the flow control of the compressor cascade

Therefore, the project team proposed an asymmetric wedge-shaped vortex generator, and redesigned the structure of the wedge-shaped vortex generator to minimize the size of the vortex generator on the branch side of the control suction surface, thereby effectively reducing the shape resistance loss and the separation of the air flow on the suction side, which solves the problem that the wedge-shaped vortex generator is not strong enough to reduce the flow loss of the compressor

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