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 computational fluid dynamic (CFD) model with the volute and impeller is established and validated by experimental measurements. Following this, an unsteady three-dimensional (3D) simulation is conducted on a single passage imposed by the pulsating backpressure conditions, which are obtained by one-dimensional (1D) 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 is 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.
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April 2019
Research-Article
Unsteady Responses of the Impeller of a Centrifugal Compressor Exposed to Pulsating Backpressure
Mengying Shu,
Mengying Shu
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: mengy_shu@sjtu.edu.cn
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: mengy_shu@sjtu.edu.cn
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Mingyang Yang,
Mingyang Yang
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: myy15@sjtu.edu.cn
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: myy15@sjtu.edu.cn
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Ricardo F. Martinez-Botas,
Ricardo F. Martinez-Botas
Mechanical Engineering Department,
Imperial College London,
London SW7 2AZ, UK
e-mail: r.botas@imperial.ac.uk
Imperial College London,
London SW7 2AZ, UK
e-mail: r.botas@imperial.ac.uk
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Kangyao Deng,
Kangyao Deng
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: kydeng@sjtu.edu.cn
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: kydeng@sjtu.edu.cn
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Lei Shi
Lei Shi
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: shi_lei@sjtu.edu.cn
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: shi_lei@sjtu.edu.cn
Search for other works by this author on:
Mengying Shu
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: mengy_shu@sjtu.edu.cn
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: mengy_shu@sjtu.edu.cn
Mingyang Yang
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: myy15@sjtu.edu.cn
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: myy15@sjtu.edu.cn
Ricardo F. Martinez-Botas
Mechanical Engineering Department,
Imperial College London,
London SW7 2AZ, UK
e-mail: r.botas@imperial.ac.uk
Imperial College London,
London SW7 2AZ, UK
e-mail: r.botas@imperial.ac.uk
Kangyao Deng
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: kydeng@sjtu.edu.cn
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: kydeng@sjtu.edu.cn
Lei Shi
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: shi_lei@sjtu.edu.cn
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: shi_lei@sjtu.edu.cn
1Corresponding author.
Manuscript received September 1, 2018; final manuscript received September 16, 2018; published online November 1, 2018. Editor: Jerzy T. Sawicki.
J. Eng. Gas Turbines Power. Apr 2019, 141(4): 041005 (9 pages)
Published Online: November 1, 2018
Article history
Received:
September 1, 2018
Revised:
September 16, 2018
Citation
Shu, M., Yang, M., Martinez-Botas, R. F., Deng, K., and Shi, L. (November 1, 2018). "Unsteady Responses of the Impeller of a Centrifugal Compressor Exposed to Pulsating Backpressure." ASME. J. Eng. Gas Turbines Power. April 2019; 141(4): 041005. https://doi.org/10.1115/1.4041658
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