前言高压离心压缩机的最后几级,由于容积流量的缩小,叶轮的相对宽度很小,宽度的绝对尺寸往往只有几毫米。这时,边界层对气流的流动和损失有着极大的影响,级效率不高。叶轮内的流动损失主要是流动摩擦损失和法向压差引起的二次流损失,这两者又相互影响。由于二次流的存在使边界层的流动具有三元性 Preface High-pressure centrifugal compressor last few stages, due to the reduced volume flow, the relative width of the impeller is very small, the absolute width of the size is often only a few millimeters. At this time, the boundary layer has a great impact on the flow and loss of air flow, and the efficiency is not high. The loss of flow in the impeller is mainly caused by the loss of flow friction and the loss of secondary flow caused by the normal pressure difference, which in turn affect each other. Due to the existence of secondary flow, the boundary layer flow has the characteristics of the ternary