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Research Papers: Flows in Complex Systems

Parametric Investigation of Circumferential Grooves on Compressor Rotor Performance

[+] Author and Article Information
Yanhui Wu

School of Power and Energy, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, P.R. Chinawyh@nwpu.edu.cn

Wuli Chu

School of Power and Energy, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, P.R. Chinawlchu@nwpu.edu.cn

Haoguang Zhang

School of Power and Energy, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, P.R. Chinahaoguangzhang@mail.nwpu.edu.cn

Qingpeng Li

School of Power and Energy, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, P.R. Chinaliqingpeng@mail.nwpu.edu.cn

J. Fluids Eng 132(12), 121103 (Dec 06, 2010) (10 pages) doi:10.1115/1.4003000 History: Received January 16, 2009; Revised November 03, 2010; Published December 06, 2010; Online December 06, 2010

This paper presents numerical and experimental investigations about grooved casing treatment with the help of a high-speed small-scale compressor rotor. First, the numerical investigation seeks to offer a contribution of understanding the working mechanism by which circumferential grooves improve stall margin. It is found that stall margin gain due to the presence of circumferential grooves arises from the suction-injection effect and the near-tip unloading effect. Based on that, the philosophy of design of experiment is then set up. Finally, parametric studies are carried out through systematical experiments. It is found that the orthogonal experiment and the factorial analyses are successful in identifying the “best casing configuration” in terms of stall margin improvement. However, the ineffectiveness of the deduction from simulations suggests that the secondary flow circulations on stall margin gain should not be neglected, and the overall contribution of each groove to stall margin gain depends on its unloading effect and the compound effect of suction-injection. Further numerical investigation will focus on how to set up quantitative criteria to evaluate the compound effect of suction-injection and the unloading effect on stall margin gain respectively in each groove.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Cross-sectional diagram of the test rig

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Figure 2

Schematic diagrams of casing treatment

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Figure 3

Blade-to-blade view of grids

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Figure 4

Performance map compare between prediction and experiment

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Figure 5

The sketch of flow phenomena associated with the test rotor stall (13)

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Figure 6

Particle traces near rotor blade tip at smooth stall mass flow rate

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Figure 7

Relative total pressure contours in rotor blade passage at smooth stall flow rate

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Figure 8

Pressure distribution on blade surface at 99% span at smooth stall mass flow rate

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Figure 9

Radial velocity contours on casing wall with grooves at smooth stall mass flow rate

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Figure 10

Velocity vector on blade-to-blade section at blade tip at smooth wall stall flow rate

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Figure 11

Meridional contours of circumferential-averaged entropy at smooth wall stall flow rate

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Figure 12

Three basic circumferential grooves

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Figure 13

Main effects plot for stall margin improvement (8130 rpm)

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Figure 14

Main effects plot for stall margin improvement (10,765 rpm)

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