Passive Methods of Coherent Vortical Structures Control in Vortex Chambers. Part 2. Dispersion Analysis of Efficiency

Abstract

Background. Improvement of the working processes efficiency of power and technological machinery and installations of vortex type. Objective. Statistical analysis of experimental test of the new methods of power-capacious coherent vortical structures control. Just their positive influence on processes of the transfer of mass, momentum and energy in swirling flows determines to a great extent the operating effectiveness of equipment. Methods. Spectral valuations data of represented in the present article, part 1, methods of artificial vortical disturban­ces influence on power-capacious coherent formation were subjected to the more detailed numerical processing on digital foundation. Results. Analysis of distributions of the composite swirling flow average actual velocities and the fluctuating movement intensity in characteristic area of the most power-capacious coherent vortical structure testifies to its definite stability and quasi-steady current. On the strength of this fact the detailed estimation of fluctuating movement energy balance according to determined characteristic frequency bands was carried out along the researching zone. The features of action of various eddy-generator types from the standpoint of control “stiffness” of the transfer processes were shown. Dispersion analysis confirmed the data of spectral processing of the information, put in part 1 of the article regarding to discovered phenomenon of “reverse decay of the vortices”, that is the most typical for two-dimen­sional eddy-generator (EG № 1). Conclusions. Developed methods and their possible modifications offer the prospect of efficacious low-expended control on micro-level by hydromechanical, thermal and chemical processes in the cylinders of internal combustion engines, in vortex burners, combustion chambers of rocket engines, furnaces, plasmatrons, in mixers, chemical reactors, nuc­­­lear powerplants etc.