离心压气机中进口导叶尾迹的形态、输运及与叶轮流场的相互影响研究

对跨声速离心压气机中进口导叶与叶轮的相互影响作用进行了数值模拟研究，研究模型包括三种几何间距模型及对同一间距几何模型使用了两种不同的转静子交界面位置设定。计算结果表明：转静子交界面位置的设定对于多排叶片混合平面法定常计算性能会产生较大影响,5%叶轮轴向长度的变化就可造成1%的效率、2%的压比差别；进口导叶与叶轮的叶排间距大小对离心压气机级气动性能影响很小，但间距较小时会造成流场内较大的压力波动。在近叶排间距时，导叶切割叶轮激波会在导叶压力面侧产生一个高损失区，并沿导叶表面向上游传播；该高损失区由激波压力波造成。此外，激波存在与否，影响到两排叶片流场的相互影响作用强度：激波使叶轮对导叶流场的影响几倍甚至十几倍大于导叶对叶轮流场的影响；激波的影响作用使导叶压力面、吸力面侧压力波动由不同的原因造成。最后，在近叶排间距时，初始进入叶轮通道内且靠近主叶片压力面的尾迹相对靠近吸力面的尾迹片会滞后；完全进入叶轮通道后，近压力面侧尾迹的滞后更显著。

The IGV wake transport and interaction influence with the impeller blade row in centrifugal compressor

Numerical investigation of Inlet Guide Vane (IGV) and impeller interaction in a transonic centrifugal compressor was performed. Three blade-row gap and two mixing plane location settings for each gap model were included in the simulations. The results show that, the mixing plane location affects the steady calculation performance, even with 5 percent impeller axial length changing can cause 1 percent efficiency and 2 percent pressure ratio difference. The IGV-impeller gap has little effect to the compressor stage performance, but small gap leads to large pressure pulsation in flow field. In close blade-row spacing, a high loss region due to IGV chopping the impeller shock, is found at rear IGV pressure side and transported upstream along vane surface with time elapsed. Also, the incoming IGV wake near main blade pressure side shows a lag compare to near suction side part. The lag is more remarkable when the wake fully transport into impeller passage.