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Research Papers: Multiphase Flows

Numerical Analysis of Suppression Effect of Asymmetric Slit on Cavitation Instabilities in Cascade

[+] Author and Article Information
Hiroki Kobayashi

Graduate School of Engineering,
Tohoku University,
6-6, Aoba, Aramaki, Aobaku,
Sendai 980-8579, Miyagi, Japan
e-mail: kobayashi@cfs.ifs.tohoku.ac.jp

Ryosuke Hagiwara

Graduate School of Engineering,
Tohoku University,
6-6, Aoba, Aramaki, Aobaku,
Sendai 980-8579, Miyagi, Japan

Satoshi Kawasaki, Masaharu Uchiumi, Kazuyuki Yada

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

Yuka Iga

Institute of Fluid Science,
Tohoku University,
2-1-1, Katahira, Aoba-ku,
Sendai 980-8577, Miyagi, Japan
e-mail: iga@ifs.tohoku.ac.jp

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received October 12, 2016; final manuscript received August 12, 2017; published online November 7, 2017. Assoc. Editor: Olivier Coutier-Delgosha.

J. Fluids Eng 140(2), 021302 (Nov 07, 2017) (7 pages) Paper No: FE-16-1670; doi: 10.1115/1.4037989 History: Received October 12, 2016; Revised August 12, 2017

In this study, numerical analysis is carried out around the cyclic flat-plate cascade with symmetric and asymmetric slit, so as to examine the suppressing or controlling effect of the slit on cavitation instabilities such as cavitation oscillation (CO) which resembles cavitation surge, and rotating cavitation. These instabilities cause various problems for the turbomachinery, for example, rotating cavitation causes an asynchronous shaft vibration, and CO causes an oscillation of column of working fluid as a result of the resonance phenomenon of the system. In liquid propellant rocket engine, suppression device for these instabilities bring increase in cost of the launch. Therefore, it is thought that to develop effective suppression technique is important for turbopumps. Especially, in this paper, two types of the flat-plate three blades cascade which have symmetric slit on each blade and three types of the cascade which have asymmetric slit were analyzed, and the results are compared with those of cascade without slit. As a result, the CO is perfectly suppressed in both of two types cascade with asymmetric slit. Also, other examined cascades have suppression effect of CO These results indicate the possibility of suppressing cavitation instabilities in actual inducers or controlling the type of the cavitation instabilities by the arrangement of the slit. Moreover, the head performance is equal or slightly increased by arranging slit.

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References

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Figures

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Fig. 1

Computational domain

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Fig. 2

Schematic diagram of original cascade and two cascades with symmetric and asymmetric slit

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Fig. 3

Name of cascade and the slit position

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Fig. 4

Suction performance and occurrence region of cavitation instabilities: (a) cascade 000, (b) cascades 333, 666, and 567, and (c) cascades 335 and 355

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Fig. 5

Void and vector distributions of blade 2 in cascade 666 (σ = 0.17)

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Fig. 6

Pressure distribution of blade 2 in cascade 666 (σ = 0.17)

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Fig. 7

Comparison between cascades 000 and 355 about waveform of total cavity volume (upper) and inlet pressure (lower) (σ = 0.2)

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Fig. 8

Waveforms of cavity volume on each blade (lower) and flow rate of slit jet (upper) in cascade 355 (σ = 0.2)

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