An Experimental Study of Unsteady Partial Cavitation

[+] Author and Article Information
Jean-Baptiste Leroux, Jacques André Astolfi, Jean Yves Billard

Ecole Navale/IRENAV, Institute de Recherche de l’Ecole Navale, BP 600, 29240 Brest-Armee, France

J. Fluids Eng 126(1), 94-101 (Feb 19, 2004) (8 pages) doi:10.1115/1.1627835 History: Received November 21, 2002; Revised June 30, 2003; Online February 19, 2004
Copyright © 2004 by ASME
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(a) Transducer mounting. (b) Location and nomenclature of the pressure transducers, filled symbol is on the pressure side. Units in millimeter.
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Example of pressure transducer calibration curve
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Aspect of the cavity. Flow is from the left.
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(a) (b) Measured lift and drag coefficient for the non cavitating flow, straight line on (a) is the theoretical value CL=0.1097(1−0.83τ)(α+2.35) (inviscid unbounded calculation with viscous corrections, 18). (c) Lift to drag ratio for various cavity lengths, labels are the mean relative cavity lengths (see also Table 2).
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Pressure coefficient for the noncavitating flow, α=6.5 deg
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Pressure coefficient for various cavity lengths, (a) (b) (c) stable cavity, (d) unstable cavity (l/c>0.5). Vertical bars are ±Prms/q.
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Pressure fluctuation intensity for various cavity lengths
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Power spectral density, dashed line is the noncavitating flow, σ=1.34, l/c∼0.4
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Photographs of partial cavitation during cavity growth/destabilization cycle. Time between two consecutive images is 1/25e s.
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Instantaneous pressure signals during cavity growth/destabilization cycle, σ=1.25, C11 is the instantaneous pressure signals on the pressure side
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Spatial-time history of wall pressure in the cavity wake during cavity growth and vapor cloud shedding, σ=1.25. Figures on the left (resp. right) depict the sequence (a) (resp. (b)) on Fig. 10, filled symbol is transverse transducer C82.
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Spatial-time history of wall pressure during cavity destabilization and cloud cavitation (label (c) on Fig. 10), σ=1.25, dashed line is the noncavitating flow, filled symbols are transverse transducers C62 and C82
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Limit for which stable cavity transits to unstable cavity in the plane (σ,2(α−αo)). The dashed straight line is Arndt et al.’s criteria given by σ/2(α−αo)=4 (with αo=0). Angles are in radians.
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Variation of the angle of attack equivalent to the variation of the pressure on the pressure side during the growth/destabilization cycle, σ=1.25



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