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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.9

ISSN Print: 2152-5102
ISSN Online: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v33.i3.40
pages 255-264

Comparison of Slender Axisymmetric Body Drag Under Unseparated and Supercavitational Flow Regimes

O. A. Buraga
Institute of Hydromechanics of National Academy of Sciences of Ukraine, Kyiv, Ukraine
Igor G. Nesteruk
Institute of Hydromechanics of National Academy of Sciences of Ukraine 8/4, Zhelyabov St., 03680, Kyiv-180, MSP, Ukraine
Yu. N. Savchenko
Institute of Hydromechanics of National Academy of Sciences of Ukraine, Kyiv, Ukraine

ABSTRACT

The volumetric drag coefficients of slender cones are calculated for supercavitational flow patterns. The cavity is assumed as a part of useful volume and is determined with the first approximation equation. The analytical formulae for the volumetric coefficients of frictional drag and the pressure distribution are presented. The extreme cases of long and short cavities are considered. The comparison of the results with the drag coefficients of slender axisymmetric bodies in an unseparated flow shows that at cavitation numbers less than 0.001 the supercavitational regime of the flow offers few advantages, however for large values of the cavitation number the difference in drag may become small. A case of short cavities is unacceptable for drag minimization.


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