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TECHNICAL PAPERS

An Experimental Investigation of Thermal Effects in a Cavitating Inducer

[+] Author and Article Information
Jean-Pierre Franc

LEGI, Grenoble, FranceJean-Pierre.Franc@hmg.inpg.fr

Claude Rebattet

CREMHYG, Grenoble, FranceClaude.Rebattet@hmg.inpg.fr

Alain Coulon

SNECMA, Vernon, Francealain.coulon@snecma.fr

J. Fluids Eng 126(5), 716-723 (Dec 07, 2004) (8 pages) doi:10.1115/1.1792278 History: Received December 15, 2003; Revised May 12, 2004; Online December 07, 2004
Copyright © 2004 by ASME
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References

Figures

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Typical two-phase cavity
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Typical full vapor cavity
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View of the pump together with the inlet pipe. The flow is from right to left. The front window allows the observation of cavitation on the blades.
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Typical signal given by the optical probe. The lower level (0 V) corresponds to the liquid whereas the higher level (5 V) corresponds to the vapor. The void fraction is estimated from the ratio of the cumulative “vapor time” above a given threshold to the total acquisition time.
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Visualizations of the leading edge cavity for different values of the cavitation parameter up to two-phase breeding. Operating conditions: nominal flow rate, 4000 rpm, R114 at 20°C.
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Typical example of (a) efficiency of the inducer (b) map of pressure fluctuations spectra and (c) cavity length as a function of the cavitation parameter (right-hand side) or indicative void fraction (left-hand side). Operating conditions: nominal flow rate, 4000 rpm, R114 at 20°C.
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Effect of the temperature on the development of cavitation at a nearly constant cavitation number S. Operating conditions: nominal flow rate, 5000 rpm, R114.
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Variation of the cavity length with the cavitation parameter for cold water and for R114 at two different temperatures
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Estimated temperature depression as a function of the cavity length for the inducer working in R114 at different operating conditions and nominal flow rate
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B-factor of Stepanoff as a function of the cavity length for the inducer working in R114 at different operating conditions and nominal flow rate
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Evolution of the flow rate coefficient with the cavity length for a foil named EN foil (data adapted from Kamono et al. 13). The flow rate coefficient was made nondimensional using the foil thickness.

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