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research-article

Stability improvement of a turbocharger centrifugal compressor by non-axisymmetric vaned diffuser

[+] Author and Article Information
Xinqian Zheng

Turbomachinery Laboratory, State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing, 100084, China
zhengxq@tsinghua.edu.cn

Zhenzhong Sun

Turbomachinery Laboratory, State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing, 100084, China
sunzz14@mails.tsinghua.edu.cn

Tomoki Kawakubo

Corporate Research & Development, IHI Corporation, Yokohama, Japan
tomoki_kawakubo@ihi.co.jp

Hideaki Tamaki

Corporate Research & Development, IHI Corporation, Yokohama, Japan
hideaki_tamaki@ihi.co.jp

1Corresponding author.

ASME doi:10.1115/1.4038875 History: Received May 06, 2016; Revised December 02, 2017

Abstract

The non-uniformity of the flow field induced by the non-axisymmetric volute significantly exacerbates the stability of a turbocharger centrifugal compressor. In this paper, non-axisymmetric vaned diffuser as an instance of non-axisymmetric flow control method is investigated with both three-dimensional CFD and experiment. The numerical study firstly focuses on the relationship between the flow field and the static pressure distortion, and numerical results indicate that the positive static pressure gradient along rotating direction facilitates flow separations and makes the flow field non-uniform. Non-axisymmetric flow control method with variable stagger and solidity of the vaned diffuser is developed to suppress the flow separation, and it suggests to narrow the flow passages where flow separation happens or to close the diffuser vanes upstream of the flow separations. The steady CFD also presents the flow field of the investigated turbocharger centrifugal compressor with volute, and flow separation appears in flow passages near the volute tongue. Under the guidance of the non-axisymmetric flow control method, several non-axisymmetric vaned diffusers are designed, numerical analysis shows they uniform the flow field. Finally, experiment validation shows the non-axisymmetric vaned diffuser extends the stable flow range of the compressor by 26% relatively compared with axisymmetric vaned diffuser.

Copyright (c) 2017 by ASME
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