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TECHNICAL PAPERS

Effect of Hydrofoil Shapes on Partial and Transitional Cavity Oscillations

[+] Author and Article Information
Akira Fujii

 FLUENT Asia Pacific Co., Ltd., Nittochi Nishishinnjyuku Bldg. 18F, 6-10-1, Nishishinnjyuku, Shinjyuku-ku, Tokyo, 160-0023, Japanfujii@fluent.co.jp

Damien T. Kawakami

St. Anthony Falls Laboratory, University of Minnesota, Mississippi River at 3rd Ave., Minneapolis, MN 55414kawa0036@umn.edu

Yoshinobu Tsujimoto

Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka, 560-8531, Japantujimoto@me.es.osaka-u.ac.jp

Roger EA Arndt

St. Anthony Falls Laboratory, University of Minnesota, Mississippi River at 3rd Ave., Minneapolis, MN 55414arndt001@umn.edu

J. Fluids Eng 129(6), 669-673 (Jan 09, 2007) (5 pages) doi:10.1115/1.2734183 History: Received July 12, 2005; Revised January 09, 2007

The effects of foil geometry on partial and transitional cavity oscillations were examined by experiments. The transitional cavity oscillation can be observed in the upstream pressure fluctuation for all foils and the amplitude of oscillation becomes larger when the maximum cavity length becomes larger than about 75% of the chord length. The Stroulal number based on the chord length correlated with the value of a parameter σ2α and increased from 0.07 to 0.17 with the increase of σ2α from 2.0 to 6.0 for all foils. For thicker foils, the partial cavity oscillation could not be detected in the upstream pressure fluctuation. However, semi-periodical cavity shedding corresponding to the partial cavity oscillation could be visually observed for all foils and the Strouhal number based on the mean cavity length was about 0.15–0.35 for all foils. Thus, the effect of foil geometry appears only in the strength of partial cavity oscillation.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Test apparatus and test section: (a) test apparatus and (b) test section

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Figure 2

Foil shapes: (a) NACA0015, (b) NACA0010 1/2, (c) NACA0006, (d) flat plate R0.1, (e) flat plate R0.7, (f) flat plate R1.4, and (g) CAV2003

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Figure 3

Angle of attack for flat plate

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Figure 4

Spectra of upstream pressure fluctuations for NACA foils, α=8deg (uncertainty in f:±0.25Hz, in Δp∕ρU2:±0.0005 in α:±0.25deg): (a) NACA0015 and (b) NACA0006

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Figure 5

Spectra of upstream pressure fluctuations for flat plate foils, α=8deg (uncertainty in f:±0.25Hz, in Δp∕ρU2:±0.0005 in α:±0.25deg) (a) flat plate R0.1 and (b) flat plate R1.4

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Figure 6

Spectra of upstream pressure fluctuations for the CAV2003 foil (uncertainty in f:±0.25Hz, in Δp∕ρU2:±0.0005 in α:±0.25deg): (a)α=8deg and (b)α=5deg

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Figure 7

Strouhal number (Stb=fC∕U) of transitional cavity oscillations obtained from upstream pressure fluctuations (uncertainty in σ∕2α:±0.15, in Stb:±0.004): (a)α=8deg and (b)α=5deg

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Figure 8

Maximum, minimum, and mean cavity lengths obtained from high-speed video for α=8deg (uncertainty in σ∕2α:±0.15, in l∕C:±0.05)

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Figure 9

Strouhal numbers obtained by high-speed video for α=8 degrees (uncertainty in Stb:±0.015, in Stc=±0.03, in σ∕2α:±0.15 and in l∕C:±0.05): (a) Strouhal number Stb based on chord length C and (b) Strouhal number Stc based on mean cavity length l

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