Evaluation of the Efficiency of Coherent Vortex Structures Control in the Mixing Chamber by Means of Wing Eddy-Generators
DOI:
https://doi.org/10.20535/1810-0546.2018.4.133918Keywords:
Mixing chamber, Coherent vortex structures, Control, Vortex cords, Wing eddy-generator, Mutual susceptibilityAbstract
Background. Low-expended control of energy-carrying coherent vortex structures (ECVS), and, consequently, of mass, momentum and energy transfer in vortex mixing chambers (VC) to increase the working processes efficiency of vortical technological and power devices.
Objective. The aim of the paper is to investigate the reaction of ECVS in the dead-end part of the chamber and its exit on the directed control actions of the tip vortex cords, created by wing eddy-generators in the inlet nozzle of VC, based on mutual susceptibility principle of vortex structures. To give a quantitative assessment of the “subtle” effect on the ECVS, which determine the characteristics of mixing flows in the VC.
Methods. Combination of the experimental study of controlling vortices formation and the ECVS experimental characteristics with the theoretical analysis of the aerodynamic model of the wing eddy-generator.
Results. The phenomenon of average gas motion energy redistribution for the advantage of pulsation energy in the dead-end zone of the chamber, as well as pulsation energy “pumping” from small vortices to larger ones at the mixing chamber outlet were discovered. In spite of relatively small manifestations of the positive influence of controlling actions on the ECVS in the volume of the chamber dead-end part, an increase of the flow velocity pulsation energy in the characteristic zone of the VC outlet section was up to 72 %.
Conclusions. The possibility of the effective control of ECVS, which determine the processes of mass and heat transfer in vortex mixing chambers, is experimentally proved. Control is carried out by a system of continuous ordered vortex cords, which are generated by fixed wings of finite span, mounted in the chamber input nozzle.References
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