EFFICIENCY OF VORTICAL AND JET CONTROL OF CURRENT STRUCTURE IN LIMITED SWIRLING FLOWS
Keywords:Vortex chamber, Coherent vortex structures, Mutual susceptibility, Control, Vortex cords, End jets
Background. Low-cost control by energy-carrying coherent vortex structures (CVS), determining transfer processes of mass, momentum and energy in vortex mixing chambers (VC) to increase working processes efficiency in vortex technological and power apparatuses.
Objective. The purpose of the paper is to investigate the response of the CVS at the outlet of the VC on directional control actions according to two methods of influence on the CVS based on mutual susceptibility principle of vortex structures: 1 – by means of the end vortex cords from the wing eddy-generator in the inlet nozzle of the VC; 2 – with the help of turbulent jets with different orientation relative to the CVS in the deadlock part of the VC from the side of its end. The aim is to compare the results of the implementation of such control actions by analyzing the profiles of the average velocity and the relative intensity of flow velocity fluctuations at the outlet of the VC.
Methods. Experimental study of the formation and interaction of control vortices and CVS in the chamber cavity in combination with the rated estimates.
Results. An increase of the relative intensity of flow velocity fluctuations in the outlet zone of the VC by individual components is shown: from 22% to 63% in the first (vortex) method of control of the CVS and from 6% to 38% in the second (jet) control method. Thus, the effectiveness of applying the principle of mutual susceptibility of control and driving vortex structures in limited swirling flows, which is the basis of the control methods realization, is proved.
Conclusions. The possibility of efficient and low-cost control by energy-carrying CVS, which determines mass and heat transfer processes in vortex mixing chambers, is experimentally proved. Operability, features and advantages of vortex and jet control methods are shown.
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