交变电场对扩散火焰燃烧过程及NO生成的影响  

EFFECT OF ALTERNATING ELECTRIC FIELD ON THE COMBUSTION AND NO FORMATION OF DIFFUSION FLAMES

作　　者：张扬[1] 张海[1] 杨海瑞[1] 刘青[1] 朱民[1] 

机构地区：[1]清华大学热能工程系热科学与动力工程教育部重点实验室,北京100084

出　　处：《工程热物理学报》2010年第12期2156-2158,共3页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.50576041)

摘　　要：本文实验研究了高频交变电场对甲烷/空气扩散火焰的影响,在较大的电压变化范围内对比了火焰的形态、中间产物浓度和燃烧产物组成的变化。实验结果表明,随着电场电压从零开始不断增大直到发生气体放电,CH和OH的体积浓度先减小后增大,最后维持在比较稳定的范围内;产物中NO的体积分数先减小,后增大,发生气体放电后急剧减小,而CO体积分数变化与NO正好相反。发生气体放电时不完全燃烧加剧,火焰不稳定性增强。This paper experimentally studied the effect of high-frequency alternating electric field on the methane/air diffusion flames and their NOx formation. The flame shape, intermediate and final products were assessed over a large-range voltage. As the voltage increased from zero to a certain value at which gas discharge occurred, the volumetric concentrations of OH and CH radicals increased firstly, then decreased and finally remained at a constant. The NO volumetric fraction firstly decreased and then increased when the voltage kept increasing, and sharply decreased when the gas discharge occurred. The CO volumetric fraction shows an inverse trend to NO. The combustion process became incomplete and the flame turned to unstable after the discharge occurred.

关 键 词：交变电场 气体放电 扩散火焰 火焰形态 NO 

分 类 号：TK16[动力工程及工程热物理—热能工程]