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Technical Briefs

Numerical Investigation of a Centrifugal Compressor With Holed Casing Treatment

[+] Author and Article Information
Wei Xu

Key Laboratory for Power Machinery and Engineering of Ministry of Education,  Shanghai Jiao Tong University, Shanghai 200240, Chinaxuwei102@sjtu.edu.cn

Tong Wang

Key Laboratory for Power Machinery and Engineering of Ministry of Education,  Shanghai Jiao Tong University, Shanghai 200240, Chinatwang@sjtu.edu.cn

Chuangang Gu1

Key Laboratory for Power Machinery and Engineering of Ministry of Education,  Shanghai Jiao Tong University, Shanghai 200240, Chinacggu@126.com

Liang Ding

Key Laboratory for Power Machinery and Engineering of Ministry of Education,  Shanghai Jiao Tong University, Shanghai 200240, China5010219021@sjtu.edu.cn

1

Corresponding author.

J. Eng. Gas Turbines Power 134(4), 044502 (Jan 25, 2012) (4 pages) doi:10.1115/1.4004444 History: Received May 12, 2011; Revised May 12, 2011; Published January 25, 2012; Online January 25, 2012

The holed casing treatment is a new type of casing treatment that has self-adaptability for a centrifugal compressor with unshrouded impeller. It was demonstrated experimentally and numerically that both the stall margin and the choked margin of the compressor were able to be expanded by the treatment. Numerical results indicate that there is reinjected flow in the holes when the compressor works at low flow rate conditions, and bypass flow at high flow rate conditions. The key principles for choosing the diameter and the radial position of the hole are presented in this paper. The hole’s diameter is an important parameter for the holed casing treatment. Five numerical cases with different diameters (1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm and 3.0 mm) were carried out to compare the results. The reinjected flow enters into the impeller passage periodically and it tends to increase when the hole diameter gets larger. In the case of 2.5 mm, both the stall margin increment and the efficiency of the compressor were the highest among the five cases. Unsteady simulations suggest that the reinjected flow is not only periodic in time but also periodic in circumferential direction. This is the reason why only 2% of the flow amounts would get 20% of the working range expansion.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Comparison of performance curves between simulations and experiments

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Figure 2

Performance curves for the five cases

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Figure 3

Flow amounts in the holes for the five cases

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Figure 4

Reinjected flow pattern in the holes for the five cases

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Figure 5

Reinjected flow velocity magnitude

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Figure 6

Reinjected flow along the normalized arc

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