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The purpose of the paper is to demonstrate the possibility of studying the dynamics of wall-free non-stationary air vortices by using of video filming, various visualization methods and particle image velocimetry. These vortices were generated over underlying surface of aluminum sheet due to its controlled heating from below as a result of development of buoyancy-driven turbulent convection of air. It is strictly emphasized that in contrary of previous studies no mechanical rotation devices and/or underlying surface rotation were used for the vortices generation. The experiments on establishing how vertical nets placed in the travel line of a sufficiently non-stationary laboratory vortex affect its dynamics have been conducted. We have distinguished several fundamental mechanisms of how nets affect a non-stationary vortex. Among these mechanisms is the action of small-scale turbulence
generated behind the net with large-scale turbulence of the model vortex, leading to violation of its symmetry.
Author(s):
Aleksei Varaksin
Joint Institute of High Temperatures, Russian Academy of Sciences
Russian Federation
Michael Romash
Joint Institute of High Temperatures, Russian Academy of Sciences
Russian Federation
Viktor Kopeitsev
Joint Institute of High Temperatures, Russian Academy of Sciences
Russian Federation