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TECHNICAL PAPERS

Propeller Cavitation Breakdown Analysis

[+] Author and Article Information
Jules W. Lindau, David A. Boger, Richard B. Medvitz, Robert F. Kunz

Applied Research Lab, The Pennsylvania State University, State College, PA 16804-0030

J. Fluids Eng 127(5), 995-1002 (May 24, 2005) (8 pages) doi:10.1115/1.1988343 History: Received March 26, 2004; Revised May 24, 2005

A Reynolds-averaged Navier-Stokes computational model of homogeneous multiphase flow is presented. Cavitation driven thrust and torque breakdown over a wide range of advance ratios is modeled for an open propeller. Computational results are presented as a form of validation against water tunnel measured thrust and torque breakdown for the propeller. Successful validation of the computational model is achieved. Additional observations are made with regards to cavity size and shape as well as cavitation breakdown behavior.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

Computed results. Grid and flow over P4381 at design advance ratio, J=0.889. Results at three cavitation indices with surface colored by pressure and a gray isosurface of liquid volume fraction.

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Figure 2

Propeller torque coefficient [Q∕(ρn2D5)] versus advance ratio over a range of cavitation indices, experimental data (1) and computed results

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Figure 3

Propeller thrust coefficient [T∕(ρn2D4)] versus advance ratio over a range of cavitation indices, experimental data (1) and computed results

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Figure 4

Torque breakdown. Variation in propeller torque coefficient [Q∕(ρn2D5)] with cavitation index. Symbols indicate experimental data (1).

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Figure 5

Thrust breakdown. Variation in propeller thrust coefficient [T∕(ρn2D4)] with cavitation index. Symbols indicate experimental data (1).

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Figure 6

Flow over P4381, J=0.7, σ=3.5. (a) Multiphase RANS solution, three views showing surface colored by pressure and a gray isosurface of liquid volume fraction. (b) Diagram and picture from Boswell (1) indicating extent of experimentally observed cavitation.

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Figure 7

Computed (UNCLE-M) pressure on both pressure and suction side at 30% of span and at selected cavitation numbers. Surface pressure also illustrated by color and cavity size indicated by gray surface of constant volume fraction, αl=0.5. Design advance ratio, J=0.889.

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Figure 8

Computed (UNCLE-M) pressure on both pressure and suction side at 70% of span and at selected cavitation numbers. Surface pressure also illustrated by color and cavity size indicated by gray surface of constant volume fraction, αl=0.5. Design advance ratio, J=0.889.

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Figure 9

Computed (UNCLE-M) pressure on both pressure and suction side at 30% of span and at selected cavitation numbers. Surface pressure also illustrated by color and cavity size indicated by gray surface of constant volume fraction, αl=0.5. Highly loaded condition. Advance ratio, J=0.6.

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Figure 10

Computed (UNCLE-M) pressure on both pressure and suction side at 70% of span and at selected cavitation numbers. Surface pressure also illustrated by color and cavity size indicated by gray surface of constant volume fraction, αl=0.5. Highly loaded condition. Advance ratio, J=0.6.

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Figure 11

Grid sensitivity data. Nominal grid, o-grid, and coarse grid results for cavitation breakdown. Comparison of performance predictions at design advance ratio (J=0.889). Coarse grid is topologically similar to nominal grid with exactly 12 of the resolution in each of the computational dimensions. Nominal grid contains 1,258,320, o-grid 1,516,560, and coarse grid 157,290 control volumes.

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