Approximate mathematical models in high-speed hydrodynamics |
| |
Authors: | Emil V Paryshev |
| |
Affiliation: | (1) Central Aerohydrodynamic Institute named after Prof. N.E. Zhukovsky (TsAGI), Moscow Branch “Moscow Complex of TsAGI”, 17, Ulitsa Radio, Moscow, 105005, Russia |
| |
Abstract: | Approximate solutions of some problems in high-speed hydrodynamics are given, the solutions being based upon well-known approaches,
such as the principle of independence of cavity expansion (Logvinovich), formulation of the problem of the immersion of a
solid contour into liquid (Wagner), various models of cavity closure in its tail, etc. Theoretical studies of the dynamic
properties of slender ventilated cavities are performed. The mathematical model of a cavity is obtained in the form of a system
of nonlinear time-delay differential equations. The linear theory of cavity stability and oscillations is developed for various
cavity types. The mechanism of nonlinear cavity oscillations accounting for gas-bubble detachment is considered, and the results
of extensive numerical experimentation are presented. A theoretical model of cavity closure is proposed that develops the
well-known Efros approach with a re-entrant jet. An approximate analysis of the model has been performed. A planar problem
of the impact and immersion of an expanding cylinder into liquid with a cylindrical free surface of variable radius is solved
in Wagner’s formulation. |
| |
Keywords: | cavitation dynamic stability immersion into liquid planing pulsation |
本文献已被 SpringerLink 等数据库收录! |
|