Direct numerical simulation of non-premixed syngas burning with detailed chemistry

Abstract

Hydrogen/carbon monoxide syngas non-premixed impinging jet flames were studied using three-dimensional direct numerical simulation (DNS) and flamelet generated manifolds (FGMs) based on detailed chemical kinetics. The computational domain employed has a size of 4 jet nozzle diameters in the streamwise direction and 12 jet nozzle diameters in the cross-streamwise direction. The results presented in this study were performed using a uniform Cartesian grid with 200 x 600 x 600 points. The Reynolds number used was Re=2000, based on the reference quantities. The spatial discretisation was carried out using a sixth-order accurate compact finite difference scheme and the discretised equations were time-advanced using a third-order accurate fully explicit compact-storage Runge–Kutta scheme. Results show that the ratio of hydrogen and carbon monoxide in the syngas mixture significantly affects the flame characteristics including the near-wall flame structure. The high diffusivity of hydrogen-rich syngas flame leads to form weaker vortices and a thicker flame. In contrast, carbon monoxide-rich syngas flame leads to form a thinner flame with strong wrinkles. Moreover, the DNS results suggest that the preferential diffusion influences the local flame structure for the simulated low Reynolds number hydrogen flame.

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ORCID for K.K.J. Ranga Dinesh: orcid.org/0000-0001-9176-6834

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