0
research-article

Performance Analysis of a Centrifugal Compressor based on Circumferential Flow Distortion Induced by Volute

[+] Author and Article Information
Mengying Shu

School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
mengy_shu@sjtu.edu.cn

Mingyang Yang

School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
myy15@sjtu.edu.cn

Kangyao Deng

School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
kydeng@sjtu.edu.cn

Xinqian Zheng

Automotive Engineering Department, Tsinghua University, Beijing, 100084, China
zhengxq@tsinghua.edu.cn

Ricardo F. Martinez-Botas

Mechanical Engineering department, Imperial College London, London, SW7 2AZ, England
r.botas@imperial.ac.uk

1Corresponding author.

ASME doi:10.1115/1.4040681 History: Received December 04, 2017; Revised June 19, 2018

Abstract

A volute is one of the key components in a centrifugal compressor. Previous researches showed that the stability of the compressor deteriorates remarkably when a volute is employed. This paper investigates the influence of volute-induced circumferential distortion on the stability of a centrifugal compressor via experimentally validated 3-D numerical method. Firstly, the performance of the compressor is analyzed based on the stability parameter and the impeller is confirmed to be the main contributor to the compressor instability. Next, the influence of volute on the impeller performance is studied by cases with circumferential distortions exerted on the impeller exit. Results show that the performance of an impeller passage is determined by not only the back pressure but also the local gradient of the pressure distribution in circumferential direction. Moreover, these passages confronted with pressure reduction in rotational direction are the most unstable ones, while those confronted with pressure raise have better performance. Consequently, circumferentially distorted pressure distribution at impeller exit results in a loop of passage performance encapsulating the performance of case with uniform distribution. The size of the loop is enhanced by the distortion amplitude. The influence of the distortion on the impeller performance is concluded into two main reasons: the force imbalance of flow and the imbalance of tip clearance flow taken by passages. The force imbalance influences the accumulation of secondary flow, while the imbalance of the tip clearance flow results in discrepancies of the low momentum flow in passages.

Copyright (c) 2018 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In