Inhibition Effects of CH_(4)/CH_(3)OH on Dimethyl Ether Cool Flames  

作　　者：ZHOU Xun ZHANG Rui YANG Shenghua LIU Dong 

机构地区：[1]Key Laboratory of Thermal Control of Electronic Equipment,Ministry of Industry and Information Technology,Nanjing,210094,China [2]Advanced Combustion Laboratory,School of Energy and Power Engineering,Nanjing University of Science and Technology,Nanjing,210094,China

出　　处：《Journal of Thermal Science》2023年第6期2284-2296,共13页热科学学报(英文版)

基　　金：The authors gratefully acknowledge the support from the National Key R&D Program of China(2016YFB0600100);the Fundamental Research Funds for the Central Universities(30919012104).

摘　　要：CH_(4)/DME mixtures can be used for engines and gas turbines,and have already been studied for many years.However,DME has a strong cool flame phenomenon,which will greatly influence the ignition and combustion characteristics of following hot flames.Therefore,the cool flame characteristics of CH_(4)/DME mixture are very important for their utilization.Recently,the inhibition effect of CH_(4)on DME cool flames has been discovered,but the mechanisms of the inhibition effects lack further verification and research.In this study,the inhibition effects were investigated via both experiments and simulations.In order to validate the inhibition effects,a comparison fuel of CH_(3)OH/DME was also used in this study.The extinction limits,flame temperatures and combustion products of the cool flames of the CH_(4)/DME and CH_(3)OH/DME mixtures were measured using a counterflow burner,and the reaction paths and heat release rate were derived from the HPMech-v3.3.The results indicate that CH_(4)and CH_(3)OH will both inhibit the cool flame of DME via competing with DME for OH and O radicals,and CH_(3)OH has stronger inhibition effects than CH_(4),because it is more competitive and produces more CH2O,which inhibits the oxidation of DME.The HPMech-v3.3 closely agrees with the experimental data,but still needs to be improved.

关 键 词：cool flame dimethyl ether METHANE METHANOL non-premixed counterflow flame 

分 类 号：TK16[动力工程及工程热物理—热能工程]