1.序言在小型燃气轮机、废气涡轮增压器、空气压缩机及其他类似的机组中,多数要用到结构紧凑的大功率径流压气机,这种压气机具有高的圆周速度及大的压缩比。在这些压气机中,叶片扩压器的作用很重要。它有助于获得高效率的轻型压气机。叶片扩压器有许多结构型式,其效率高低各不相同。构成不同型式的原因是由于对真实的流动特性缺乏了解。因此,过去和现在的研 1. INTRODUCTION In compact gas turbines, exhaust gas turbochargers, air compressors and other similar units most of the compact high-power radial compressors are used, which have high circumferential speeds and large compression ratios . In these compressors, the role of the vane diffuser is very important. It helps to get a high efficiency light compressor. There are many types of blade diffuser structure, its efficiency varies. The reason for the different types is due to a lack of understanding of the true mobility characteristics. Therefore, past and present research