3D Numerical Simulation of Multi-Stage Compressor of a Turbo-shaft Engine and Its Evaluation of Performance Characteristic

Three-dimensional numerical analysis of rotating components of a turbo-shaft engine including 3 stages axial compressors and one stage centrifugal compressors is performed by CFX software. Compressible flow equations are solved by using pressure based method and SST turbulence model. After grid study, compressor performance curve are obtained by changing the boundary conditions of the compressor inlet and outlet. The results show that there is a secondary flow from hub to tip in the first stage of axial compressor because of its high axial chord length. Also, flow in the first stage rotor is transonic. Moreover, in the centrifugal compressor, secondary flow phenomenon, jet-wake region and slip phenomenon at the impeller outlet are obtained from the numerical analysis.