通道参数对超声速叶栅性能的影响

In order to study the effects of throat⁃to⁃inlet area ratio, throat position and solidity on the performance of supersonic cascade at the minimum loss point, a series of planar cascades with designed Mach number 1.4 and different passage parameters were obtained based on a blading method of directly controlling the cascade passage.The results of numerical calculations and flow field analysis showed that the cascades can be divided into started and transitional ones according to different shock wave structures in cascade passages.Throat parameters mainly affected cascade performance by changing the location of the shock wave system.For a started cascade, the minimum total pressure loss decreased and the static pressure ratio increased when the throat⁃to⁃inlet area ratio was smaller and the throat position moved further forward, just the opposite for a transitional cascade.The structure of the shock wave system changed with the solidity.A tight solidity made more cascades started, having lower minimum total pressure loss and higher static pressure ratio, while wider solidity made more cascades non⁃started, having lager margin.