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TECHNICAL PAPERS

A BEM for the Prediction of Unsteady Midchord Face and/or Back Propeller Cavitation

[+] Author and Article Information
Yin L. Young, Spyros A. Kinnas

Ocean Engineering Group, The University of Texas at Austin, Austin, TX 78712

J. Fluids Eng 123(2), 311-319 (Jan 31, 2001) (9 pages) doi:10.1115/1.1363611 History: Received November 03, 1999; Revised January 31, 2001
Copyright © 2001 by ASME
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References

Figures

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Propeller subjected to a general inflow wake. The propeller fixed (x,y,z) and ship fixed (xs,ys,zs) coordinate systems are shown.
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Top: definition of the exact surface; Bottom: definition of the approximated cavity surface.
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Definition of the cavity height on the blade and on the supercavitating wake
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Geometry and inflow wake of propeller DTMB4148
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Convergence of cavity volume with number of propeller revolutions for propeller DTMB4148. 60×20 panels. Δθ=6 deg, σn=2.576,Js=0.954,Fr=9.159.
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Convergence of cavity volume with blade angle increments for propeller DTMB4148. 60×20 panels. σn=2.576,Js=0.954,Fr=9.159.
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Convergence of cavitating blade force coefficients with blade angle increments for propeller DTMB4148. 60×20 panels. σn=2.576,Js=0.954,Fr=9.159.
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Convergence of cavity volume with panel discretization for propeller DTMB4148. Δθ=6 deg, σn=2.576,Js=0.954,Fr=9.159.
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Convergence of cavitating blade force coefficients with panel discretization for propeller DTMB4148. Δθ=6 deg, σn=2.576,Js=0.954,Fr=9.159.
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Geometry of propeller DTMB5168. Also shown are the predicted and measured KT and KQ for different advance coefficients. PROPCAV v1.2: 80×40 Panels. MPUF-3A v1.2: 20×18 panels.
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Geometry and inflow wake of propeller DTMB4119. Also shown are the predicted and measured KT and KQ for different blade harmonics. PROPCAV v1.2: 80×50 Panels. MPUF-3A v1.2: 40×24 panels.
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Comparison OF PROPCAV’s prediction (top) to experimental observations (bottom) for propeller DTMB4148. Js=0.954,σn=2.576,Fr=9.159, 70×25 panels, Δθ=6 deg.
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Comparison of the predicted and versus measured KT,KQ, and η for different advance coefficients. Propeller SRI. σv=0.4, σnv×Js2.
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Geometry, cavitation pattern, and cavitating pressures for propeller SRI at Js=1.3,σv=0.4,σnv×Js2.
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Cavity shape and pressures for propeller MW1. Mid-chord cavitation. The propeller is based on a design by Michigan Wheel Corporation, USA. Js=1.224,σn=0.8116,Fr=26.6, 60×20 panels. Uniform inflow.
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Validation of simultaneous face and back cavitation on an asymmetric rectangular hydrofoil. 50×10 panels. α=±0.3 deg. fo/C=±0.018(NACA0.8),to/C=0.05(RAE),σv=0.15.
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Validation of simultaneous face and back cavitation on an asymmetric rectangular hydrofoil. 50×10 panels. α=±0.5 deg. fo/C=±0.018(NACA0.8),to/C=0.05(NACA66),σv=0.08.
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Predicted 3-D cavity shape for propeller MW1. The propeller is based on a design by Michigan Wheel Corporation, USA. 60×20 panels. Js=1.224,σn=0.8116, Fr=25.6. Uniform inflow.
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The convergence of predicted cavities (expanded view) and forces with respect to number of panels for propeller MW1. The propeller is based on a design by Michigan Wheel Corporation, USA. Js=1.224.σn=0.8116, Fr=25.6. Uniform inflow.

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