动叶clocking对低速压气机性能影响的数值模拟

采用二维非定常数值模拟的方法研究了动叶相对位置的改变对低速压气机气动性能的影响。结果显示不同的动叶相对位置会改变上游动叶尾迹与下游动叶之间的相对位置以及下游叶列周围的周期性和湍流性速度波动。当上游尾迹被输运到下游叶列前缘附近的时候，对应较高的级效率；当上游尾迹被输运到下游叶列流道中央的时候，对应级效率较低．正确的配置动叶的相对位置，将会显减少第二列动叶表面流动的非定常性，对叶片气动性能有改善的作用。

Numerical Simulation of Rotor Clocking Effect in a Low-Speed Compressor

Two-dimensional (2D) unsteady numerical simulation has been applied to study the effect of the variation in relative circumferential positions of rotors on the performance of a low speed compressor. The result shows that the variation will change the relative position of upstream rotor wake to the downstream rotor as well as the periodic and turbulent velocity fluctuations on the airfoils. When the upstream rotor wake impinges upon the leading edge of the downstream rotor, the corresponding stage efficiency will be higher; when the upstream wake is transferred into the mid-passage of the downstream rotor, the corresponding stage efficiency will be lower. The proper configuration of the relative position of rotors will cause obvious reduction in the unsteady aerodynamic effect on the second rotor airfoils and improve the aerodynamic performance of blades.