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Numerical assessment on improving multistage centrifugal impeller performance by changing inlet skew angle at impeller inlet

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Journal of Central South University 2012年第4期19卷 953-961页

作者： M.N.Labib Woo Ju-sik Choi Du-youl T.Utomo B.Fajar Chung Han-shik Jeong Hyo-min Graduate School of Department of Mechanical and Precision Engineering Gyeongsang National UniversityTongyeong 650-160Korea Fluid and Thermal Engineering Co.Ltd. Kyungnam 621-843Korea Department of Mechanical Engineering Engineering FacultyUniversity of DiponegoroSemarang 1269Indonesia Department of Mechanical and Precision Engineering Gyeongsang National UniversityThe Institute of Marine Industr yTongyeong 650-160Korea Department of Mechanical and Precision Engineering Gyeongsang National UniversityThe Institute of Marine Industr yTongyeong 650-160Kore

Multistage centrifugal impellers with four different skew angles were investigated by using computational fluid *** purpose of this work is to investigate the influences of lean angle at the blade tip of the impeller *** variations of lean angles,that is,8°,10°,15° and 20°,were made at first stage *** Average Navier Stokes equation was used in simulation together with a shear?stress transport(SST) k-w turbulence model and mixing-plane approach,*** dimensional fluid flows were simplified using periodic model to reduce the computational cost and time required.A good performance was expected that the secondary flow can be effectively reduced in the flow passage of the impeller without excessive increase in manufacturing cost caused by the secondary *** results show that secondary flow affects the main flow intricately to form vortices or having non-uniform velocity in the flow passage,which in turn results in substantial fluid energy loss not only in the impeller but also in the guide vane downstream of *** numerical solutions were performed and allowed the optimum design and operating conditions to be obtained.

关键词： computational fluid dynamics secondary flow blade inlet skew angle multistage centrifugal compressor

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