Dynamic Processes of Supercavitation and Computer Simulation
Abstract
This lecture is devoted to unsteady processes in the flows with natural and artificial supercavitation. We consider two classes of phenomena: (1) forced non-stationarity of the flow which is induced by external causes - a model velocity change an ambient pressure impulse a variation of gas supply into a cavity etc.; and (2) self-exited oscillation arising due to internal instability of gas-filled supercavities. Results of computer simulation of the dynamic supercavitation processes are presented. They were obtained by using the approximate mathematical model based on the G. Logvinovich independence principle of the supercavity expansion. A comparison of unsteady behavior of axisymmetric and two-dimensional supercavities is given. Formulation and solution of two 2-D problems are presented: (1) the problem on instability of the 2-D gas-filled supercavity; and (2) the problem on evolution of the 2-D supercavity past an oscillating wedge. The solutions are based on the M. Tulin's linearized cavitation scheme. The lecture material is illustrated by sequences of motion-picture flames and photographs of the unsteady supercavitation processes. They were obtained at the hydrodynamic laboratory of the Institute of Hydromechanics of NAS of Ukraine (IHM UNAS).
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 2001
- Accession Number
- ADP012081
Entities
People
- Vladimir N. Semenenko
Organizations
- National Academy of Sciences of Ukraine