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

作　　者：Jian Zhang LiPo Wang YuQing Guo 

机构地区：[1]State Key Laboratory of Nonlinear Mechanics(LNM),Chinese Academy of Sciences,Beijing 100190,China [2]UM-SJTU Joint Institute,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2020年第4期119-124,共6页中国科学：物理学、力学、天文学（英文版）

基　　金：the National Natural Science Foundation of China(Grant No.11572330);the support from the Engineering Research Center of Gas Turbine and Civil Aero Engine,Ministry of Education of China;the support from International Clean Energy Talent Program by China Scholarship Council(Grant No.201904100044);Open founding of National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics of China(Grant No.6142702180307).

摘　　要：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.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 

分 类 号：O357.5[理学—流体力学] O175[理学—力学]