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Technical Briefs

Mechanisms and Key Parameters for Compressor Blade Stall Flutter

[+] Author and Article Information
Xiaowei Zhang

e-mail: xwzhang1984@gmail.com

Yanrong Wang

e-mail: yrwang@buaa.edu.cn

Kening Xu

e-mail: xukening@126.com
School of Jet Propulsion,
Beihang University,
Beijing 100191, China

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the Journal of Turbomachinery. Manuscript received July 20, 2010; final manuscript received March 5, 2012; published online November 1, 2012. Assoc. Editor: Matthew Montgomery.

J. Turbomach 135(2), 024501 (Nov 01, 2012) (4 pages) Paper No: TURBO-10-1121; doi: 10.1115/1.4007441 History: Received July 20, 2010; Revised March 05, 2012

This paper describes a fluid-structure interaction (FSI) numerical method in frequency domain to improve the overall understanding of the mechanisms of compressor blade stall flutter and to identify the key flutter parameters. The numerical method, whose accuracy is verified by comparing the numerical predicted stall flutter boundary with that measured through engine rig tests in a compressor rotor, is applied to investigate the effects of blade mode, reduced velocity, and interblade phase angle (IBPA) on flutter stability, and to reveal the flutter mechanisms directly related to shock wave properties and flow separation effects. It is found that the shock wave on the suction surface and the separation area behind it are important flutter inducements.

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References

Figures

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Fig. 1

Moveable region of the cascade

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Fig. 2

Measured and calculated characteristic map

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Fig. 3

AMDR versus ND for point 100b

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Fig. 4

Aerodynamic work of 1B mode at 0ND: (a) suction surface and (b) pressure surface

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Fig. 5

Distribution of aerodynamic work in 90% height at 0ND

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Fig. 6

Relationship of reduced velocity and incident angle

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Fig. 7

Comparison of static pressure and stream line with aerodynamic work distribution on suction surface at 0ND: (a) 100a and (b) 100b

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Fig. 8

Normalized force and displacement plots for different points at 90% height

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