离心叶轮与径向扩压器非定常干涉效应研究

Research on Unsteady Interference Effect of Centrifugal Impeller and Radial Diffuser

本文以某离心压气机为研究对象,开展非定常数值模拟,深入探索离心叶轮和径向扩压器之间的非定常干涉效应,以及产生的周向流场畸变在径向扩压器和回流器内的传播特征。研究表明:径向扩压器对离心叶轮的影响主要体现在势作用上,扩压器的势干扰使得叶轮出口静压发生周期性变化,进而引起叶轮后部负荷等也产生周期性变化;在离心叶轮的作用下,扩压器进口气流角分布呈现较强的非定常性,影响范围覆盖了整个扩压器通道;径向扩压器流场中的畸变区域,沿周向朝压气机转动相反的方向旋转。

To further explore the unsteady interfering effect of centrifugal impellers and radial diffusers and the transformation of the distortion,the unsteady numerical simulation of a centrifugal compressor is presented in this paper.The research shows,that the impact of diffuser on the centrifugal impeller is imposed through the potential field,which causes periodic variation of the static pressure as well as blade loading at the outlet of the impeller;l moreover,under the influence of the impeller,the area of influence covers the entire diffuser channel;the distorted region in the radial diffuser flow field,rotates circumferentially in the opposite direction to the compressor rotation.