I.G.Nesteruk Drag reduction of slender axisymmetric high-speed bodies |
Applied hydromechanics, Vol. 11 (83) ¹ 2, (2009) |
| E With the use of known analytic dependences for the slender axisymmetric cavity shapes after the slender or the non-slender cavitators, it was shown that the value of the volumetric drag coefficient and the similar coefficients, based on the squared values of the length and the caliber, can sufficiently be reduced at cavitation number smaller than 0.01. The smallest values of these drag coefficients correspond to the largest aspect ratios and the slender cavitators. Comparison of the drags of the supercavitating and unseparated flow patterns showed the existence of the critical values of the volume and sizes. The supercavitating flow pattern is preferable for the subcritical values of these parameters. For the horizontal supercavitation motion, the necessity of the Archimedes force compensation sufficiently diminishes the critical values of the vehicle volume or its sizes, which achieve maximum at a certain value of the motion velocity. In the case of the base cavity existence, the estimations of the supercavitating hull pressure drag and the comparison with the unseparated flow pattern are presented. The critical values of the body volume have maximum at a certain value of the movement velocity and drastically increase with the aspect ration increasing. |
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| TEXT LANGUAGE: Ukrainian |