Passive methods of coherent vortical structures control in vortex chambers. Part 1. Spectral evaluation of efficiency
DOI:
https://doi.org/10.20535/1810-0546.2015.6.56084Keywords:
Coherent vortical structures, Control, Vortex chamber, Hot-wire measurements, Probability density distribution, Vortices mutual susceptibility, Power spectral density of velocity fluctuationsAbstract
Background. Investigation of the limited flow structure and possibilities of its control in vortex chambers as elements of power units and manufacturing machinery for its working processes optimal setting.
Objective. The quest of more perfect methods of control by energy carrying coherent vortical structures (ECVS) that have essential influence on processes of mass, momentum and energy transfer in swirling flows and therefore determine the efficiency of installation work.
Methods. The frequency-spatial regions of ECVS, in which the correct statistical analysis of directed actions on its by artificial disturbing eddy formations is possible, are determined by means of visualization and hot-wire measuring of kinematic characteristics of wall current in the test vortex chamber. The disturbing eddy formations are generated in rectangular groove or in three hemispherical dimples of defined dimensions which are built directly in intake nozzle of chamber with adherence to necessary conditions of mutual susceptibility of vortical structures. Numerical processing of measured signals was carried out by fast Fourier transform algorithm.
Results. Small by energy controlling actions to input flow cause substantial rise of power spectral density of velocity fluctuations on the most energy carrying frequencies – approximately in 2–11.5 times depending on eddy-generator type and frequency band, including the “transfer” of energy density to the most large-scale eddy components of ECVS. This fact detects in ECVS all signs of typical open nonlinear dynamical system: existence of resonant modes with sharpening, when the energy feed from controlling vortices and its equiphase perception by Görtler-Ludwieg vortices take place not on full mode spectrum, but selectivity, only for certain harmonic components.
Conclusions. It has been proved experimentally the possibility of effective and low-powered control by macro- and microstructure of swirling flows. It opens the perspective of elaboration of new in principle methods for intensification of the transportable substances transfer in cylinders of internal-combustion engines, in vortex burners, combustors, chambers of rocket engines, furnaces, plasmatrons, mixers, chemical reactors, nuclear power plants etc.
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