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Research Papers: Multiphase Flows

Thermodynamic Effect on Subsynchronous Rotating Cavitation and Surge Mode Oscillation in a Space Inducer

[+] Author and Article Information
Yoshiki Yoshida1

e-mail: yoshida.yoshiki@jaxa.jp

Hideaki Nanri, Kengo Kikuta

Japan Aerospace Exploration Agency,  Kakuda Space Center, Koganezawa 1, Kimigaya, Kakuda, Miyagi 981-1525, Japan

Yusuke Kazami, Yuka Iga, Toshiaki Ikohagi

 Institute of Fluid Science, Tohoku University, Katahira 2-1-1, Aoba, Sendai, Miyagi 980-8577, Japan

1

Corresponding author.

J. Fluids Eng 133(6), 061301 (Jun 15, 2011) (7 pages) doi:10.1115/1.4004022 History: Received November 06, 2010; Revised April 13, 2011; Published June 15, 2011; Online June 15, 2011

The relationship between the thermodynamic effect and subsynchronous rotating cavitation was investigated with a focus on cavity fluctuations. Experiments on a three-bladed inducer were conducted with liquid nitrogen at different temperatures (74, 78, and 83 K) to confirm the dependence of the thermodynamic effects. Subsynchronous rotating cavitation appeared at lower cavitation numbers in liquid nitrogen at 74 K, the same as in cold water. In contrast, in liquid nitrogen at 83 K the occurrence of subsynchronous rotating cavitation was suppressed because of the increase of the thermodynamic effect due to the rising temperature. Furthermore, unevenness of cavity length under synchronous rotating cavitation at 83 K was also decreased by the thermodynamic effect. However, surge mode oscillation occurred simultaneously under this weakened synchronous rotating cavitation. Cavity lengths on the blades oscillated with the same phase and maintained the uneven cavity pattern. It was inferred that the thermodynamic effect weakened peripheral cavitation instability, i.e., synchronous rotating cavitation, and thus axial cavitation instability, i.e., surge mode oscillation, was easily induced due to the synchronization of the cavity fluctuation with an acoustic resonance in the present experimental inlet-pipe system.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Cryogenic inducer test facility of JAXA

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Figure 2

Locations of pressure taps along the blade

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Figure 3

Example of estimated cavity region obtained from measured pressure distribution under normal cavitation pattern with even cavity length

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Figure 4

FFT analyses of pressure fluctuation and direct observation of rotating cavitation in cold water at 300 K from Ref. [1]. (a) Super-synchronous rotating cavotation. (b) Synchronous rotating cavotation. (c) Subsynchronous rotating cavitation (uncertainty in σ = 0.002, f = 1.0 Hz).

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Figure 5

Variation of the thermodynamic function Σ(T) of water and nitrogen

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Figure 6

FFT analyses of unsteady pressure fluctuation in nitrogen at 74 K (uncertainty in σ/σ0  = 0.02, f = 0.5 Hz)

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Figure 7

Indirect observations of rotating cavitations in nitrogen at 74 K

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Figure 8

Comparisons of cavity fluctuations under rotating cavitations at temperatures of 74, 78, and 83 K in nitrogen (uncertainty in σ/σ0  = 0.02, Lc /h = 0.03)

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Figure 9

Influence of the nondimensional thermodynamic parameter on rotating cavitations (uncertainty in σ/σ0  = 0.02, Σ* = 0.2)

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Figure 10

FFT analyses of unsteady pressure fluctuation at 83 K (uncertainty in σ/σ0  = 0.02, f = 0.5 Hz)

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Figure 11

Fluctuation of cavity length under surge mode oscillation in nitrogen at 83 K (uncertainty in Lc /h = 0.03)

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Figure 12

Indirect observations of surge mode oscillation in nitrogen at 83 K

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Figure 13

Propagating speed ratio of rotating cavitation ω/Ω and Strouhal number St of rotating cavitations (super/sub SRC), and surge mode oscillation (SMO) (uncertainty in σ/σ0  = 0.02, ω/Ω = 0.005, St = 0.003)

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