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research-article

UNSTEADY RESPONSES OF THE IMPELLER OF A CENTRIFUGAL COMPRESSOR EXPOSED TO PULSATING BACKPRESSURE

[+] 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

Ricardo F. Martinez-Botas

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

Kangyao Deng

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

Lei Shi

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

1Corresponding author.

ASME doi:10.1115/1.4041658 History: Received September 01, 2018; Revised September 16, 2018

Abstract

The flow in intake manifold of a heavily downsized internal combustion engine has increased levels of unsteadiness due to the reduction of cylinder number and manifold arrangement. The turbocharger compressor is thus exposed to significant pulsating backpressure. This paper studies the response of a centrifugal compressor to this unsteadiness using an experimentally validated numerical method. A CFD model with the volute and impeller is established and validated by experimental measurements. Following this, an unsteady three-dimensional simulation is conducted on a single passage imposed by the pulsating backpressure conditions which are obtained by 1-D unsteady simulation. The performance of the rotor passage deviates from the steady performance and a hysteresis loop, which encapsulates the steady condition, is formed. Moreover, the unsteadiness of the impeller performance is enhanced as the mass flow rate reduces. The pulsating performance and flow structures near stall are more favorable than those seen at constant backpressure. The flow behavior at points with the same instantaneous mass flow rate are substantially different at different time locations on the pulse. The flow in the impeller is determined by not only the instantaneous boundary condition but also by the evolution history of flow field. This study provides insights in the influence of pulsating backpressure on compressor performance in actual engine situations, from which better turbo-engine matching might be benefited.

Copyright (c) 2018 by ASME
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