Direct numerical simulation of nonpremixed syngas burning with detailed chemistry

Ranga Dinesh, K.K.J. and Jiang, Xi and van Oijen, J. A. (2013) Direct numerical simulation of nonpremixed syngas burning with detailed chemistry. Fuel, 107. pp. 343-355. ISSN 1873-7153

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H2/CO 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 four 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 × 600 × 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 H2 and CO in the syngas mixture significantly affects the flame characteristics including the near-wall flame structure. The high diffusivity of H2-rich syngas flame leads to form weaker vortices and a thicker flame. In contrast, CO-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 H2 flame.

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25 Mar 2013 11:41
Last Modified:
21 Nov 2022 23:29