Measurement and Modeling of Propeller Cavitation in Uniform Inflow

[+] Author and Article Information
Francisco Pereira

Francesco Salvatore, Fabio Di Felice

Istituto Nazionale per Studi ed Esperienze di Architettura Navale, Via di Vallerano, 139-00128 Rome, Italy

J. Fluids Eng 126(4), 671-679 (Sep 10, 2004) (9 pages) doi:10.1115/1.1778716 History: Received July 04, 2003; Revised February 20, 2004; Online September 10, 2004
Copyright © 2004 by ASME
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Image cross-correlation procedure: (a) template image; (b) cavitation pattern image; (c) local cross-correlation; (d) correlation image
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Warping procedure: original (top) and warped (bottom) images
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Computational grid used for flowfield analysis of the E779A propeller, and wake surface evaluated by the flow-alignment technique (MB=36,MB/NB=2,MW/NB=5,NHtot=252)
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Effect of grid refinement on the non cavitating thrust coefficient KT at J =0.71
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Effect of grid refinement on the cavity area fraction AC/A0 at J =0.71 , σn=1.515
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Cavity volume histories using different initial guesses of the cavity extension (J =0.71 , σn=1.515)
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E779A model propeller cavitation chart; pressure coefficient distributions on the blade suction and pressure sides and associated images, at two characteristic conditions: J =0.65 , σn=0.528;J =0.77 , σn=2.082
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Planform view of the cavitating blade and predicted cavitation area at J =0.71 (top row), 0.77 (center) and 0.83 (bottom): free wake model (solid line), prescribed wake model (dashed line)
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Effect of parameters J and σn on the cavity area Ac. Comparison between measurements and numerical results (free wake model).
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Effect of cavitation number σn on the propeller thrust coefficient
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Effect of cavitation number σn on the propeller torque coefficient




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