Diffusion combustion of microjets modulated by dean vortices

The paper presents the results of experimental investigation of circular jets forming as the Dean vortices modulate them at the curved channel exit. Some features of the jet flow are analyzed under the conditions of interaction between the Dean vortices and the KelvinHelmholtz ring vortices which results in the jet evolution different from that observed as the jet is generated behind circular and flat nozzles at the straight channel exit. In turn, the variations in the flow structure influence the regime of the diffusion jet combustion. The effect of Dean vortices on combustion of hydrogen and its mixture with oxygen and that of propane is analyzed in this paper. Flame transformation under forcing of external acoustic waves at a proper frequency stimulating flow instability is discussed. & COPY; 2023 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

This paper presents the experimental investigation on circular jets formed by the modulation of Dean vortices at the curved channel exit. The interaction between Dean vortices and the Kelvin-Helmholtz ring vortices affects the flow structure and combustion regime of the diffusion jet. The effects of Dean vortices on combustion of hydrogen, hydrogen-oxygen mixture, and propane are analyzed, including flame transformation induced by external acoustic waves.