Research of the flow structure and characteristics of heat exchange and combustion flow of swirling gas in a cooled channel with a porous material was carried out. Research of the effect of the swirl on the flame structure and localization of the combustion zone was carried out.
The influence of the turbulent combustion model on the position of the flame zone in a swirling flow is analyzed. Three models of turbulent combustion were analyzed: a model of volumetric combustion, a model of turbulent pulsations, and a model of vortex decay. The research results show that the data of the combustion model controlled by turbulent mixing are in the best agreement with the experimental data.
Investigation of the flame stabilization in a swirling flow has been carried out. In non-swirling flow, combustion is carried out in induction mode. Weak swirling of the flow leads to the curvature of the flame and displacement of the combustion zone to the inlet section. The curvature of the flame front in the flow with moderate swirling, exceeds the maximum allowable value, which ensures combustion stabilization, and the flame is extinguished. The intensive swirling leads to formation a recirculation zone in the flow. In this case, hot combustion products in the recirculation zone ignite the combustible mixture entering the channel.
This paper analyses conditions of flame stabilization in a channel with moderate swirling of a flow and low Reynolds numbers. The effect of swirling on the flame structure and localization of the combustion zone is investigated, and the conditions for flameout in flows with a moderate swirling flow are determined.
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