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

FUEL

卷:107

Article

Dinesh, K. K. J. Ranga¹  Jiang, X.²  van Oijen, J. A.³ 

[1] Univ Southampton, Fac Engn & Environm, Energy Technol Res Grp, Southampton SO17 1BJ, Hants, England

[2] Univ Lancaster, Dept Engn, Lancaster LA1 4YR, England

[3] Eindhoven Univ Technol, Dept Mech Engn, NL-5600 MB Eindhoven, Netherlands

关键词: Syngas combustion;    Preferential diffusion;    Impinging jet;    DNS;    FGM;   

DOI  :  10.1016/j.fuel.2013.01.014

来源: Elsevier

【 摘 要 】

H-2/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 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 H-2 and CO in the syngas mixture significantly affects the flame characteristics including the near-wall flame structure. The high diffusivity of H-2-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 H-2 flame. Crown Copyright (c) 2013 Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free