A 3D compressible flow model was presented in Part I of the paper to study the occurrence of weak rotating waves in vaneless diffusers of centrifugal compressors. In this paper, detailed results on the influences of flow and diffuser geometry parameters, including inlet Mach number, inlet distortion, wave number, diffuser outlet-to-inlet radius ratio, diffuser width to inlet radius ratio, and impeller backswept angle, on the rotating waves are presented. It was found that inlet spanwise distortion of radial velocity has little effects on diffuser stability, but rotating wave speed increases with the distortion. The speed also increases with inlet Mach number, so does diffuser instability. Impeller backswept improves diffuser stability and this effect increases with diffuser radius ratio. Multiple resonances were found when impeller backswept is coupled to inlet distortion of radial velocity. These resonances may have similar stabilities but with different wave speeds, suggesting that two rotating waves with different rotating speeds may occur at the same time. Diffuser width was found to have little effects on stability and on wave speed if the same maximum and same minimum values of inlet distortion of radial velocity are kept, but have some effects if the values are not kept. A comparison was also made between the present model predictions and results in open literatures, and good agreement with the experimental results than previous 2D models was achieved.
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July 2012
Research Papers
A 3D Compressible Flow Model for Weak Rotating Waves in Vaneless Diffusers—Part II: Detailed Results
Feng Sheng,
e-mail: shenfeng1981@live.cn
Feng Sheng
Shanghai Jiaotong University
, 800 Dongchuan Road, Min Hang, Shanghai 200240, China
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Hua Chen,
Hua Chen
Honeywell Turbo Technologies Ltd.
, Stanley Green Trading Estate, Cheadle Hume, Cheshire SK8 6QS, UK
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Xiao-cheng Zhu,
Xiao-cheng Zhu
Shanghai Jiaotong University
, 800 Dongchuan Road, Min Hang, Shanghai 200240, China
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Zhao-hui Du
Zhao-hui Du
Shanghai Jiaotong University
, 800 Dongchuan Road, Min Hang, Shanghai 200240, China
Search for other works by this author on:
Feng Sheng
Shanghai Jiaotong University
, 800 Dongchuan Road, Min Hang, Shanghai 200240, Chinae-mail: shenfeng1981@live.cn
Hua Chen
Honeywell Turbo Technologies Ltd.
, Stanley Green Trading Estate, Cheadle Hume, Cheshire SK8 6QS, UK
Xiao-cheng Zhu
Shanghai Jiaotong University
, 800 Dongchuan Road, Min Hang, Shanghai 200240, China
Zhao-hui Du
Shanghai Jiaotong University
, 800 Dongchuan Road, Min Hang, Shanghai 200240, ChinaJ. Turbomach. Jul 2012, 134(4): 041011 (7 pages)
Published Online: July 21, 2011
Article history
Received:
September 4, 2010
Revised:
December 29, 2010
Online:
July 21, 2011
Published:
July 21, 2011
Connected Content
A companion article has been published:
A 3D Compressible Flow Model for Weak Rotating Waves in Vaneless Diffusers—Part I: The Model and Mach Number Effects
Citation
Sheng, F., Chen, H., Zhu, X., and Du, Z. (July 21, 2011). "A 3D Compressible Flow Model for Weak Rotating Waves in Vaneless Diffusers—Part II: Detailed Results." ASME. J. Turbomach. July 2012; 134(4): 041011. https://doi.org/10.1115/1.4003654
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