The Study Of Flow Control Technology On Compressor Cascade Endwall

Highly loaded compressor plays an important role in advanced gas turbine. Adopting flow control technology to improve the performance of compressor has drawn the researchers'attention.This paper employed the active/passive vortex generator which can control the flow of certain compressor's rectangular endwall region to improve the cascade performance.Based on the numerical calculation software, this paper studied the main influences,which caused by the active/passive vortex generator, on the endwall flow of a compressor rectangular cascade. The active vortex generator was a jet pipe and the passive one was the geometry that had a convex at the leading edge. For the active vortex generator, this paper studied the influences of different axial positions, circumferential positions, lateral angles and jet total pressures on the internal flow performance of a compressor rectangular cascade at zero angle of attack. And on this basis, further study on the internal flow performance of a compressor rectangular cascade at different angles was conducted. Besides, the internal flow performance of a compressor rectangular cascade at different angles and incidence angles which was defined in the passive vortex generator was studied.The results indicated that the active vortex generator could effectively improve compressor cascade flow performance at the 0° incidence angle and positive incidence angle.Expanding stable working range of positive incidence angle to +3°, total pressure loss was reduced by 42.2%, and the jet flow mass was about 0.3% of the mainstream flow mass generally, the good results have been achieved with less cost at the same time. When under negative incidence angle, the active vortex generator caused different influences on the performance of compressor rectangular cascade with different incidence angles. As for the passive vortex generator, it could effectively improve compressor cascade flow performance at the 0° and positive incidence angle. Meanwhile, expanding stable working range of positive incidence angle to +3°, total pressure loss was reduced by 44.8%. With the increase of absolute value of negative incidence angle, the flow loss increased correspondingly. And total pressure loss' maximum increase could reach to 6.3% at -6° incidence angle.