Effect of air flow turbulence, acceleration and separation on the velocity and temperature fields and mass transfer in the boundary layer with ethanol combustion
B.F. Boyarshinov
Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
Keywords: turbulence, acceleration, separation, combustion of a mixture, diffusion combustion, streamlines, isotherms, flame front
Abstract
The problems of interaction between gas dynamics and combustion are considered using the well-known database of experimental results on the boundary layer with ethanol combustion. Gas dynamics is represented by streamlines, combustion is represented by isotherms. The influence of an increased degree of air turbulence (up to 18%), acceleration in a narrowing channel, and the influence of the height of a flame stabilizing fin (3 and 6 mm) on the flow structure in individual cross-sections and in the boundary layer as a whole are studied. It is shown that immediately behind the barrier, where the signs of kinetic reaction of the gas mixture are manifested, the streamlines intersect, and during combustion in a narrowing channel with low air turbulence, the isotherms and streamlines become equidistant near the flame front, as in the case of diffusion response. Mass transfer on the liquid fuel surface remains conservative to changes in the gas-dynamic parameters of the air flow.
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