On compressible subsonic flow between impeller and casing of radial-flow compressors with superposed throughflow

The subject of this paper is a numerical investigation of the flow between the impeller and the casing of compressors of radial construction. The solution procedure is based on implicit difference equations, in which parameters of material such as heat conductivity, viscosity and density are variable. Because of the assumption of low density, laminar flow conditions are assumed. The computation method makes possible the determination of the torque coefficient as a function of Reynolds and Mach numbers as well as of geometry and superposed through flow.