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Thermophysics and Aeromechanics

2013 year, number 6

Experimental investigation of the effect of small-obstacle-induced vortex sheet on the separated flow in cavity

A.Yu. D’yachenko, V.I. Terekhov, and N.I. Yarygina
Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
Keywords: поперечная каверна, отрывной турбулентный поток, термографическая визуализация, теплоотдача, коэффициенты давления, неустойчивость
Pages: 705–712


In the present paper, we report results of an experimental study of the influence which a vortex-generating element installed upstream of the main obstacle has on the separated flow and heat transfer in a cross-flow cavity-trench. The element was a small cross-flow rib whose height was an order of magnitude smaller than the depth of the cavity. In the experiments, the variable parameters were the angle of inclination of the frontal and rear walls of the cavity, the rib height, and the rib-to-cavity distance. It is shown that the introduction of additional vortical perturbations into the recirculation zone leads to a substantial modification of both the vortex production process and the distributions of pressure and heat-transfer coefficients. Optimal height of the mini-turbulizer and its optimal location are defined by the fall of the re-attachment point of mini-rib-generated flow onto the rear wall of cavi-ty. In the latter situation, the maximal value of the heat-transfer coefficient increases as compared to the case with no vortex generator used, the increase amounting to 30 %.