Partial cavitation reduces hydrofoil friction, but a drag penalty associated with unsteady cavity dynamics usually occurs. With the aid of inviscid theory a design procedure is developed to suppress cavity oscillations. It is demonstrated that it is possible to suppress these oscillations in some range of lift coefficient and cavitation number. A candidate hydrofoil, denoted as OK-2003, was designed by modification of the suction side of a conventional NACA-0015 hydrofoil to provide stable drag reduction by partial cavitation. Validation of the design concept with water tunnel experiments has shown that the partial cavitation on the suction side of the hydrofoil OK-2003 does lead to drag reduction and a significant increase in the lift to drag ratio within a certain range of cavitation number and within a three-degree range of angle of attack. Within this operating regime, fluctuations of lift and drag decrease down to levels inherent to cavitation-free flow. The favorable characteristics of the OK-2003 are compared with the characteristics of the NACA-0015 under cavitating conditions.
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September 2006
Technical Papers
Hydrofoil Drag Reduction by Partial Cavitation
Eduard Amromin,
Eduard Amromin
Mechmath LLC
, Prior Lake, MN 55372
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Jim Kopriva,
Jim Kopriva
Saint Anthony Falls Laboratory,
University of Minnesota
, Minneapolis, MN 55414
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Roger E. A. Arndt,
Roger E. A. Arndt
Saint Anthony Falls Laboratory,
University of Minnesota
, Minneapolis, MN 55414
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Martin Wosnik
Martin Wosnik
Saint Anthony Falls Laboratory,
University of Minnesota
, Minneapolis, MN 55414
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Eduard Amromin
Mechmath LLC
, Prior Lake, MN 55372
Jim Kopriva
Saint Anthony Falls Laboratory,
University of Minnesota
, Minneapolis, MN 55414
Roger E. A. Arndt
Saint Anthony Falls Laboratory,
University of Minnesota
, Minneapolis, MN 55414
Martin Wosnik
Saint Anthony Falls Laboratory,
University of Minnesota
, Minneapolis, MN 55414J. Fluids Eng. Sep 2006, 128(5): 931-936 (6 pages)
Published Online: February 7, 2006
Article history
Received:
February 28, 2005
Revised:
February 7, 2006
Citation
Amromin, E., Kopriva, J., Arndt, R. E. A., and Wosnik, M. (February 7, 2006). "Hydrofoil Drag Reduction by Partial Cavitation." ASME. J. Fluids Eng. September 2006; 128(5): 931–936. https://doi.org/10.1115/1.2234787
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