Experimental study on tip vortex cavitation (TVC) was carried out for elliptical hydrofoils with various chord lengths. The purpose of the experiment was to clarify the influences of Reynolds number and water quality on tip vortex cavitation. Experiments were made in a large cavitation tunnel of the Naval Systems Research Center, TRDI/Ministry of Defense Japan. The elliptical hydrofoils tested were NACA 0012 cross section with chord lengths of 500mm, 250mm and 50mm. Reynolds number based on hydrofoil chord length was 2×105 < ReC < 7.4×106. Water quality of the tunnel was characterized by air content and nuclei distribution. Air content of the tunnel was varied between 30% and 80%. Nuclei distribution was measured by a cavitation susceptibility meter (CSM) with center-body venturi. Cavitation inception was determined from high speed video observation. A standard formula, (σL/σS) = (ReL/ReS)n, was applied for the scaling. In the present study, exponent of the scaling law n was found to be 0.2 < n < 0.4. High speed video observation showed that the process of the TVC inception strongly depends on water quality. In the experiments, unsteady behaviors of TVC were also investigated. Strong interactions between sheet cavitation and TVC were observed.
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ASME-JSME-KSME 2011 Joint Fluids Engineering Conference
July 24–29, 2011
Hamamatsu, Japan
Conference Sponsors:
- Fluids Engineering Division
ISBN:
978-0-7918-4441-0
PROCEEDINGS PAPER
Observation and Scaling of Tip Vortex Cavitation on Elliptical Hydrofoils
Shigeki Nagaya,
Shigeki Nagaya
Naval Systems Research Center, TRDI/Ministry of Defense, Nakameguro, Meguro-ku, Tokyo, Japan
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Risa Kimoto,
Risa Kimoto
Naval Systems Research Center, TRDI/Ministry of Defense, Nakameguro, Meguro-ku, Tokyo, Japan
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Kenji Naganuma,
Kenji Naganuma
Naval Systems Research Center, TRDI/Ministry of Defense, Nakameguro, Meguro-ku, Tokyo, Japan
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Takayuki Mori
Takayuki Mori
Naval Systems Research Center, TRDI/Ministry of Defense, Nakameguro, Meguro-ku, Tokyo, Japan
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Shigeki Nagaya
Naval Systems Research Center, TRDI/Ministry of Defense, Nakameguro, Meguro-ku, Tokyo, Japan
Risa Kimoto
Naval Systems Research Center, TRDI/Ministry of Defense, Nakameguro, Meguro-ku, Tokyo, Japan
Kenji Naganuma
Naval Systems Research Center, TRDI/Ministry of Defense, Nakameguro, Meguro-ku, Tokyo, Japan
Takayuki Mori
Naval Systems Research Center, TRDI/Ministry of Defense, Nakameguro, Meguro-ku, Tokyo, Japan
Paper No:
AJK2011-33015, pp. 225-230; 6 pages
Published Online:
May 25, 2012
Citation
Nagaya, S, Kimoto, R, Naganuma, K, & Mori, T. "Observation and Scaling of Tip Vortex Cavitation on Elliptical Hydrofoils." Proceedings of the ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 2, Fora. Hamamatsu, Japan. July 24–29, 2011. pp. 225-230. ASME. https://doi.org/10.1115/AJK2011-33015
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