Research Papers: Multiphase Flows

Impact of Hydrofoil Material on Cavitation Inception and Desinence

[+] Author and Article Information
Eduard Amromin

Mechmath LLC,
Federal Way, WA 98003
e-mail: amromin@aol.com

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received August 20, 2016; final manuscript received January 30, 2017; published online April 19, 2017. Assoc. Editor: Matevz Dular.

J. Fluids Eng 139(6), 061304 (Apr 19, 2017) (6 pages) Paper No: FE-16-1533; doi: 10.1115/1.4035949 History: Received August 20, 2016; Revised January 30, 2017

Flow-induced vibration of hydrofoils affects pressure pulsations on their surfaces and influences cavitation inception and desinence. As these pulsations depend on the hydrofoil material, cavitation inception and desinence numbers for hydrofoils of the same shape made from different metals can be substantially different. This conclusion is based on the comparison of the multistep numerical analysis of fluid–structure interaction for hydrofoils Cav2003 with earlier obtained experimental data for them. The material impact on cavitation must be taken into account in future experiments.

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Fig. 6

Hydrofoil spanwise bending deformations V(C/2) at resonances of 393 Hz

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Fig. 5

Effect of hydrofoil material on its spanwise load distributions on Cav2003 at resonances in a water tunnel

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Fig. 4

Spectra of lift pulsation for aluminum and steel hydrofoils Cav2003 in water tunnel computed using Eqs. (1)(3)

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Fig. 3

Comparison of computed (line) and measured (triangles) hydrofoil NACA0015 surface velocity

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Fig. 2

Excitation spectrum for a water tunnel normalized by its maximum harmonic

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Fig. 1

Observed cavitation inception and desinence numbers for aluminum and steel Cav2003

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Fig. 7

Deflection of trailing edges of diverse sections of the aluminum Cav2003 in the water tunnel

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Fig. 17

A view of water tunnel employed in experiments [5]

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Fig. 18

Hydrofoil material impact on σd and σi; symbols show experimental data, and lines show numerical results

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Fig. 15

Computed and measured cavitation inception and desinence numbers for Cav2003

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Fig. 16

Comparison of computed (line) and measured [5] cavitation desinence number for the steel hydrofoil

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Fig. 8

Chordwise bending deformation of the hydrofoil section at resonances

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Fig. 9

Impact of trailing edge thickness on lift coefficient pulsation of the tip section of aluminum hydrofoil Cav2003. Thin solid line corresponds to the edge thickness of 0.005C, and dashed thick line corresponds to the edge thickness of 0.01C.

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Fig. 10

Impact of material on lift coefficient pulsation of tip section of hydrofoil Cav2003 in a water tunnel

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Fig. 11

Comparison of instant pressure distributions near the leading edges of hydrofoils made from different materials

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Fig. 12

Histories of Cp minima at α = 6 deg for hydrofoils made from different materials

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Fig. 13

Sketch of a sheet cavity. The gray rectangle in the top of this plot is a fragment of a real cavity photo. A small vicinity of the cavity leading edge is marked on the photo and schematically shown in the bottom of the plot. The pressure distribution along hydrofoil in the left part of the plot is plotted in the real scale.

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Fig. 14

Cavitation inception and desinence numbers for bodies with hemispherical heads; experimental data [16] on σI are marked as 5HB, data [17] on σd as 12GG and 40GG, and data [18] as 5K. Number at data sets and for computational curves show values of D (in cm).




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