Ignition enhancement of ethylene/air by NOx addition

doi:10.1016/j.cja.2013.04.023

CORC > 北京大学 > 工学院

	Ignition enhancement of ethylene/air by NOx addition
	Guo Peng ; Chen Zheng
刊名	chinese journal of aeronautics
	2013
关键词	Ethylene/air Ignition enhancement NOx addition Reaction path analysis Sensitivity analysis PROPAGATING SPHERICAL FLAMES COMBUSTION HYDROCARBONS OXIDATION MIXTURES HYDROGEN ENERGY FLOW AIR
DOI	10.1016/j.cja.2013.04.023
英文摘要	Recently, non-equilibrium plasma assisted combustion (PAC) has been found to be promising in reducing the ignition delay time in hypersonic propulsion system. NOx produced by non-equilibrium plasma can react with intermediates during the fuel oxidation process and thereby has influence on the combustion process. In this study, the effects of NOx addition on the ignition process of both the homogeneous ethylene/air mixtures and the non-premixed diffusion layer are examined numerically. The detailed chemistry for ethylene oxidization together with the NOx sub-mechanism is included in the simulation. Reaction path analysis and sensitivity analysis are conducted to give a mechanistic interpretation for the ignition enhancement by NOx addition. It is found that for both the homogenous and non-premixed ignition processes at normal and elevated pressures, NO2 addition has little influence on the ignition delay time while NO addition can significantly promote the ignition process. The ignition enhancement is found to be caused by the promotion in hydroxyl radical production which quickly oxidizes ethylene. The promotion in hydroxyl radical production by NO addition is achieved in two ways: one is the direct production of OH through the reaction HO2 + NO = NO2 + OH, and the other is the indirect production of OH through the reactions NO + O-2 = NO2 + O and C2H4 + O = C2H3 + OH. Moreover, it is found that similar to the homogeneous ignition process, the acceleration of the diffusion layer ignition is also controlled by the reaction HO2 + NO = NO2 + OH. (C) 2013 Production and hosting by Elsevier Ltd. on behalf of CSAA & BUAA.; Engineering, Aerospace; SCI(E); EI; 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); 3; ARTICLE; 4; 876-883; 26
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/154438]
专题	工学院
推荐引用方式 GB/T 7714	Guo Peng,Chen Zheng. Ignition enhancement of ethylene/air by NOx addition[J]. chinese journal of aeronautics,2013.
APA	Guo Peng,&Chen Zheng.(2013).Ignition enhancement of ethylene/air by NOx addition.chinese journal of aeronautics.
MLA	Guo Peng,et al."Ignition enhancement of ethylene/air by NOx addition".chinese journal of aeronautics (2013).