微小定容腔内喷射正丁烷/空气着火与燃烧特性  

Experimental Study on Ignition and Combustion Characteristics of Injected n-Butane/Air Mixtures in a Miniature Constant-Volume Chamber

作　　者：周光照 蒋利桥[1] 赵黛青[1,2] 祝兴林 杨卫斌[1] 汪小憨[1] Zhou Guangzhao;Jiang Liqiao;Zhao Daiqing;Zhu Xinglin;Yang Weibin;Wang Xiaohan(Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences,Guangzhou 510640,China;Department of Thermal Science and Energy Engineering,University of Science and Technology of China,Hefei 230027,China;Chizhou WENERGY Power Company Limited,Chizhou 247100,China)

机构地区：[1]中国科学院广州能源研究所,广东广州510640 [2]中国科学技术大学热科学和能源工程系,安徽合肥230027 [3]池州皖能环保电力有限公司,安徽池州247100

出　　处：《内燃机学报》2021年第5期424-430,共7页Transactions of Csice

基　　金：国家重点基础研究发展计划资助项目(2014CB239600);国家重点研发计划政府间国际科技创新合作重点专项资助项目(2016YFE 0127500)。

摘　　要：利用微小定容腔着火及燃烧试验平台,开展了喷射进气时正丁烷/空气的热着火与燃烧特性研究.结果表明:火焰在热丝表面形成后向外传播,传播过程中火焰呈现强烈褶皱状,后期表现为多点着火;高热丝温度下,当量比为0.9~1.5时出现"着火—熄火—再着火"的现象.着火时间随热丝温度增加而缩短,缩短程度和当量比有关;低热丝温度下,着火时间随当量比增大而延长,高热丝温度下,着火时间随当量比增大先缩短后延长,这是预混气加热和化学反应影响程度不同所致.在接近贫/富燃极限工况时,热丝温度对燃烧中最大压力差Δp_(max)的影响不明显,其他条件下,随温度和当量比增大,Δp_(max)均先增大后减小.A miniature constant-volume chamber setup was utilized to carry out experimental study of ignition and combustion characteristics of injected n-butane/air mixtures.Results indicate that the flame of the injected nbutane/air mixture forms at the hot wire surface and then spreads outwards.In the following stage,the injected nbutane/air mixtures are ignited at several dispersed points and the flames are wrinkled during flame propagation.The injected mixtures with equivalence ratios of 0.9—1.5 undergo the processes of ignition-quenching-reignition at the relatively high hot wire temperature.The ignition time decreases as the hot wire temperature increases,and the decreasing degree is related to the equivalence ratio.The ignition time increases as the equivalence ratio increases at the low hot wire temperature,while it decreases first and then increases as the equivalence ratio increases at high temperature.This is caused by the different influencing degree of the mixture heating and chemical reaction at dif-ferent temperatures.Under extremely lean/rich fuel conditions,the hot wire temperature does not influence the maximum pressure differenceΔp_(max) during combustion process obviously.Under other equivalence ratio conditions,Δp_(max) both increases first and then decreases as the hot wire temperature increases or the equivalence ratio increases.

关 键 词：微小定容燃烧腔 正丁烷 热着火 燃烧特性 

分 类 号：TK431[动力工程及工程热物理—动力机械及工程]