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TECHNICAL PAPERS

A Numerical Tool for the Design/Analysis of Dual-Cavitating Propellers

[+] Author and Article Information
Y. L. Young

Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ 08544yyoung@princeton.edu

Y. T. Shen

Carderock Division, Naval Surface Warfare Center, Bethesda, MD 20817young.shen@navy.mil

J. Fluids Eng 129(6), 720-730 (Nov 30, 2006) (11 pages) doi:10.1115/1.2734224 History: Received June 07, 2006; Revised November 30, 2006

The motivation of this work is to develop a numerical tool to explore a new propeller design with dual-cavitating characteristics, i.e., one that is capable of operating efficiently at low speeds in subcavitating (fully wetted) mode and at high speeds in the supercavitating mode. To compute the hydrodynamic performance, a three-dimensional (3D) potential-based boundary element method (BEM) is presented. The BEM is able to predict complex cavitation patterns and blade forces on fully submerged and partially submerged propellers in subcavitating, partially cavitating, fully cavitating, and ventilated conditions. To study the hydroelastic characteristic of potential designs, the 3D BEM is coupled with a 3D finite element method (FEM) to compute the blade stresses, deflections, and dynamic characteristics. An overview of the formulation for both the BEM and FEM is presented. The numerical predictions are compared to experimental measurements for the well-known Newton Rader (NR) three-bladed propeller series with varying pitch and blade area ratios. Comparison of the performance of the Newton Rader blade section to conventional blade sections is presented.

Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Comparison of classical SCP/SPP blade section and the proposed dual-cavitating blade section

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Figure 2

TAP 2 strut/foil system shown in (15)

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Figure 3

Propeller-fixed (x,y,z) and ship-fixed (xs,ys,zs) coordinate systems (from (26))

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Figure 4

Blade section and discretized geometry of NR propeller A3/71/125

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Figure 5

Blade section and discretized geometry of NR propeller A3/95/124

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Figure 6

Measured open water characteristics for propellers A3/71/125 and A3/95/124 by (40)

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Figure 7

Predicted and measured (40) thrust coefficients and efficiencies for propeller A3/71/125

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Figure 8

Predicted and measured (40) thrust coefficients and efficiencies for propeller A3/95/124

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Figure 9

Different blade section designs for propeller A3/71/125

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Figure 10

Predicted thrust breakdown curves for the different blade section designs for propeller A3/71/125, J=1.0

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Figure 11

Predicted thrust breakdown curves for the different blade section designs for propeller A3/71/125, J=1.1

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Figure 12

Predicted cavitation patterns for the different blade section designs for propeller A3/71/125, J=1.0

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Figure 13

Predicted cavitation patterns for the different blade section designs for propeller A3/71/125, J=1.1

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Figure 14

Predicted pressure distributions for the different blade section designs for propeller A3/71/125 at J=1.1 and σ=2.0

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Figure 15

Predicted von Mises stress distributions for the different blade section designs for propeller A3/71/125 at J=1.1 and σ=2.0

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Figure 16

Predicted leading-edge axial displacements for the different blade section designs for propeller A3/71/125 at J=1.1 and σ=2.0

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Figure 17

Predicted natural frequencies and mode shapes for the different blade section designs for propeller A3/71/125

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