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Research Papers

Phenomenon and Mechanism of Two-Regime-Surge in a Centrifugal Compressor

[+] Author and Article Information
Xinqian Zheng

State Key Laboratory of Automotive Safety and
Energy,
Tsinghua University,
Beijing 100084, China
e-mail: zhengxq@tsinghua.edu.cn

Anxiong Liu

State Key Laboratory of Automotive Safety and
Energy,
Tsinghua University,
Beijing 100084, China

The illustration has confirmed by the dynamic experiment, which would also be proved by the operation “q” at 85% maximum speed in Fig. 8 and operation “l” at 70% of maximum speed in Fig. 4, respectively.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received May 8, 2014; final manuscript received December 27, 2014; published online February 3, 2015. Assoc. Editor: Ricardo F. Martinez-Botas.

J. Turbomach 137(8), 081007 (Aug 01, 2015) (7 pages) Paper No: TURBO-14-1067; doi: 10.1115/1.4029547 History: Received May 08, 2014; Revised December 27, 2014; Online February 03, 2015

“Two-regime-surge” is a special instability behavior of compressors, which was investigated in this paper. When the compressor operates at medium rotor speed, mild surge happens first, where the transient pressure signals show sinusoidal form with Helmholtz frequency of the compressor system. Reducing the mass flow rate, the mild surge vanishes and gets replaced by the local stall. Further reducing the mass flow rate, deep surge breaks out suddenly. During two-regime-surge, two distinct surge patterns exit and vastly narrow stable flow range, which highlights the characteristics of two-regime-surge. It is found that the impeller leading-edge stall is a necessary part of the mild surge, while the diffuser rotating stall incepts the deep surge. At higher speeds, the mild surge oscillation prompts the early occurrence of the diffuser stall so that the mild surge transforms and the deep surge happens in advance. As a result, both regimes of mild surge and deep surge are going to merge, and the stable flow range at high rotational speed is greatly narrowed. Impeller casing treatment is considered as an effective method for flow range extension because the impeller leading-edge stall is removed and the mild surge is avoided as well.

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References

Figures

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Fig. 1

Schematic diagram of the rig test facility

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Fig. 2

Schematic of compressor cross section indicating the layout of the high-response pressure probes

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Fig. 3

The local performance map dedicating two-regime-surge transition (subplots from location A1)

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Fig. 4

Mild surge I operation “h” and its pre-operation “g” and postoperation “j” at 70% of maximum speed

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Fig. 5

Pressure-time-domain of the deep surge operation “k” at 70% of maximum speed

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Fig. 6

Pressure-time-domain of the mild surge I operation “m” at 75% of maximum speed

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Fig. 7

Pressure-time-domain of the mild surge II operation “p” at 80% of maximum speed

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Fig. 8

Deep surge operation “q” at 85% of maximum speed

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Fig. 9

Schematic diagram of two-regime-surge transformation mechanism

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Fig. 10

Two-regime-surge in Emmon’s experiment [3]

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Fig. 11

Performance map for the compressor type D50

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Fig. 12

Performance map for the compressor type D100

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