An implicit relation between temperature and reaction rate in the SLFM  

作　　者：Jian Zhang,~(a)) Guowei He,~(b)) and Guodong Jin LNM,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China 

出　　处：《Theoretical & Applied Mechanics Letters》2011年第1期47-49,共3页力学快报（英文版）

基　　金：supported by CAS(KJCX2-SW-L08), 973 Program of China(2007CB814800,2009CB724100);NSFC(11072247,10702074,10732090,50906096);the LNM initial funding for young investigators

摘　　要：The Arrhenius law implies that reaction rate is a continuous function of temperature. However,the steady laminar flamelet model(SLFM) does not explicitly give this functional relationship. The present study addresses this relation in the SLFM.It is found that reaction rate is not continuous in the mixture-fraction space.As a result,the SLFM is unable to predict local extinction and reignition.Furthermore,we use the unstable branch of the'S-curve'to fill the gap between steady burning branch and extinction one,and find that this modification leads to a continuous dependent of reaction rate on temperature.Thus the modified SLFM can describe the local extinction and reignition.The Arrhenius law implies that reaction rate is a continuous function of temperature. However,the steady laminar flamelet model(SLFM) does not explicitly give this functional relationship. The present study addresses this relation in the SLFM.It is found that reaction rate is not continuous in the mixture-fraction space.As a result,the SLFM is unable to predict local extinction and reignition.Furthermore,we use the unstable branch of the'S-curve'to fill the gap between steady burning branch and extinction one,and find that this modification leads to a continuous dependent of reaction rate on temperature.Thus the modified SLFM can describe the local extinction and reignition.

关 键 词：nonpremixed turbulent combustion local extinction and reignition steady laminar flamelet model unstable branch 

分 类 号：TK16[动力工程及工程热物理—热能工程]