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TECHNICAL PAPERS

Observation of Centrifugal Compressor Stall and Surge in Phase Portraits of Pressure Time Traces at Impeller and Diffuser Wall

[+] Author and Article Information
Chunwei Gu

Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing, 100084, Chinagcw@mail.tsinghua.edu.cn

Kazuo Yamaguchi, Toshio Nagashima

Department of Aeronautics and Astronauts, University of Tokyo, Tokyo, 113-8656, Japan

Hirotaka Higashimori

Nagasaki Res. Lab., Mitsubishi Heavy Industry Co. Ltd., Nagasaki, 8510392, Japan

J. Fluids Eng 129(6), 773-779 (Nov 22, 2006) (7 pages) doi:10.1115/1.2734249 History: Received September 07, 2005; Revised November 22, 2006

Unsteady static pressure signals due to flow instability in two types of centrifugal compressors were analyzed by employing the phase portrait reconstruction method. The sampled data corresponded to several streamwise locations along the shroud wall over a wide range of operation from design to near surge. Singular value decomposition analysis yielded successfully the discernable features of flow instability, i.e., stall and surge, which were observed with a decrease of mass flow rate. The effects of the signal-to-noise ratio was found to be the most troublesome in predicting the onset of flow instability upon pursuing the attractor behavior of the portraits. Under the latter difficult circumstance, the correlation integrals were also conveniently calculated to help to check the onset. It was clearly indicated that the behavior near rotating stall was not always recognized by the phase portrait in three-dimensional space, while the corresponding correlation integral obviously decreased close to stall. Monitoring of unsteady signals based on the phase portraits and the correlation integrals, therefore, led to a good judgement of a nonlinear fluid dynamic system response and to prevent compressors from a disastrous damage due to flow instability.

Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 3

Phase portraits of rotating stall at 30,000rpm(m∕mref=0.198)

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Figure 4

Phase portraits of classic surge at 50,000rpm(m∕mref=0.55)

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Figure 5

Fundamental phase portraits at 30,000rpm: (a)m∕mref=0.2639, (b)m∕mref=0.2308, and (c)m∕mref=0.2156

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Figure 6

(a) Correlation integral plots with three mass flow at 30,000rpm and (b) Distribution of the correlation integral versus mass flow at 30,000rpm

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Figure 7

Detailed distribution of the correlation integral near rotating stall at 30,000rpm

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Figure 8

The correlation integral versus the mass flow at various mass at 50,000rpm

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Figure 9

The correlation integrals around surge at four positions (FP vanes, 50,00rpm)

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Figure 10

The correlation Integrals vs. mass flow at four positions (DCA vanes, 50,000rpm)

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Figure 11

Test compressor and measurement positions

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Figure 12

Performance map

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Figure 13

Fundamental phase portraits reconstructed from experimental data

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Figure 14

Fundamental phase portraits reconstructed from CFD data

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Figure 15

The correlation integrals versus mass flow (low-speed rig with vaneless diffuser)

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