The Centrifugal Compressor Dimensional Flow Field Numerical Calculation And Design Modifications,

Centrifugal compressors are used in a wide range of applications in which performance is invariably among the paramount design objectives. It is the precondition of the compressor design that the relevant physical phenomena are understood sound in the three-dimensional flowfield.The aim of this paper is mainly to increase the mass flow rate of a certain centrifugal compressor. The dominating flow phenomena, which affect the performance of a compressor, are analyzed and summarized. At the same time, the applications of CFD in the compressor design are summarized. The physical model is built and the three-dimensional flowfield within the compressor is simulated by using a CFD software. The velocity distributions, the relative Mach number distributions and the flow trace distributions are visualized, and the reasons, which cause bad aerodynamic losses and make the flowfield complicated, are analyzed, including wake, secondary flow, separated flow and the interaction between shock and boundary layer.Based on the detailed analysis of the computational results, the redesigning schemes are presented to reduce flow separation and increase pressure ratio and efficiency. The essential design procedure about centrifugal compressor is also included in the paper.