SPACE AND TIME CHARACTERISTICS OF THE VELOCITY AND PRESSURE FIELDS OF THE FLUID FLOW INSIDE A HEMISPHERICAL DIMPLE GENERATOR OF VORTICES

Results of experimental investigations of the space and time characteristics of the velocity and pressure fi elds of the fl uid fl ow inside a hemispherical dimple on a plane plate are presented. Features of the formation and development of vortex strictures in such a dimple and the interaction of these structures with the dimple surface over which the fl uid fl ows and with the boundary layer of the fl uid fl ow were investigated. Integral, spectral, and correlation characteristics of the oscillations of the fl ow velocity and the dynamic and near-wall pressures in the dimple have been obtained. The velocity and direction of transfer of large-scale vortex structures and the frequency of their rotation inside the dimple, the frequency of throw of these structures out of the dimple, the frequencies of the velocity and pressure oscillations of the vortex fl ow in the dimple, the frequency of the self-vibrations of the vortex structures in the shear layer of this fl ow, and the subharmonics and higher-order harmonics of the indicated frequencies were determined.
   
Author:  V. A. Voskoboinik,a A. A. Voskoboinik,a V. N. Turik, and A. V. Voskoboinik
Keywords:  hemispherical dimple, vortex structure, velocity and pressure fi elds
Page:  1205