Analysis of Thermodynamic Effects on Cavitation Instabilities

[+] Author and Article Information
Satoshi Watanabe

Faculty of Engineering,  Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395 Japanfmnabe@mech.kyushu-u.ac.jp

Tatsuya Hidaka, Hironori Horiguchi, Yoshinobu Tsujimoto

Graduate School of Engineering Science,  Osaka University, 1-3 Machikaneyama, Toyonaka, 560-8531 Japan

Akinori Furukawa

Faculty of Engineering  Kyushu University 744 Motooka, Nishi-ku, Fukuoka 819-0395 Japan

J. Fluids Eng 129(9), 1123-1130 (Apr 10, 2007) (8 pages) doi:10.1115/1.2754326 History: Received August 30, 2006; Revised April 10, 2007

The suction performance of turbopumps in cryogenic fluids is basically much better than that in cold water because of the thermodynamic effect of cavitation. However, it is not still clear how the thermodynamic effect works on cavitation instabilities, such as rotating cavitation and cavitation surge. In the present study, the unsteady heat exchange between the cavity and the surrounding liquid is taken into account in a stability analysis using a singularity method. The results are qualitatively compared to existing experiments to clarify the research needs for deeper understanding.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 1

Model for present analysis

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Figure 2

Control volume for continuity equation

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Figure 3

Steady cavity length versus σ∕2α

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Figure 4

Solutions corresponding to conventional forward rotating cavitation for various values of Σ* and σ∕2α: (a)N=3 and (b)N=4

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Figure 5

Propagation velocity ratio plotted against steady cavity length with various values of Σ* for blade number of N=3 and 4

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Figure 6

Steady and temporal cavity shapes at stability limit for N=3(a)Σ*=0, σ∕2α=1.95 and (b)Σ*=100, σ∕2α=0.85

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Figure 7

Experimental results of propagation velocity ratio of rotating cavitation from the literature



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