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non-premixed turbulent combustion modeling based on the filtered turbulent flamelet equation

Science China(Physics,Mechanics & Astronomy) 2020年第4期63卷 119-124页

作者： Jian Zhang LiPo Wang YuQing Guo State Key Laboratory of nonlinear Mechanics(LNM) Chinese Academy of SciencesBeijing 100190China UM-SJTU Joint Institute Shanghai Jiao Tong UniversityShanghai 200240China

In turbulent combustion simulations, the flow structure at the unresolved scale level needs to be reasonably modeled. Following the idea of turbulent flamelet equation for the non-premixed flame case, which was derived based on the filtered governing equations(L. Wang, Combust. Flame 175, 259(2017)), the scalar dissipation term for tabulation can be directly computed from the resolved flowing quantities, instead of solving species transport equations. Therefore, the challenging source term closure for the scalar dissipation or any assumed probability density functions can be avoided;meanwhile the chemical sources are closed by scaling relations. The general principles are discussed in the context of large eddy simulation with case validation. The new model predictions of the bluff-body flame show sufficiently improved results, compared with these from the classic progress-variable approach.

关键词： turbulent combustion modeling turbulent flamelet equation large eddy simulation non-premixed flame

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Numerical Investigation of Effect of Porosity and Fuel Inlet Velocity on Diffusion Filtration Combustion

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Journal of Thermal Science 2021年第4期30卷 1278-1288页

作者： TAROKH Ali LAVRENTEV Artem MANSOURI Abraham Department of Mechanical Engineering Lakehead UniversityThunder BayP7B5E1Canada Department of Mechanical Engineering Higher College of TechnologyDBMDubai 15825UAE

Methane-air diffusion filtration combustion in a radiative round-jet burner was numerically investigated in this *** purpose of this study was focused on the effects of porous media porosity and gas velocity on temperature distribution and CO and NO_(x)*** chemical kinetics was used where air and methane were assumed to be at their stoichiometric ratio,while thermo-physical properties were varied per the solid matrix porosity *** characteristics were evaluated based on conduction and radiation as the two primary heat transfer modes within the solid *** simulations were carried out based on a packed bed with 3 mm alumina *** show that combustion temperature increases while the temperature gradient decreases with the increase in porosity,yielding higher NO_(x),and lower CO ***,the combustion temperature is the lowest and most uniformly distributed with 1 m/s and 3 m/s gas velocities,wherewith 3 m/s gas velocity,combustion occurs outside of the porous *** corresponding NO_(x)and CO emissions are the lowest with 1 m/s gas velocity and increase with the increase in gas velocity from 1 m/s to 10m/s.

关键词： non-premixed diffusion filtration combustion methane-air combustion porous media numerical simulation

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