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一维平面火焰OH基绝对浓度值的测量与分析

ISSN号：1006-8740
期刊名称：《燃烧科学与技术》
时间：0
分类：TK16[动力工程及工程热物理—热能工程]
作者机构：[1]哈尔滨工业大学能源科学与工程学院,哈尔滨150001, [2]哈尔滨工业大学航天学院,哈尔滨150001, [3]机械工业第九设计研究院有限公司,长春130000
相关基金：国家重大仪器开发专项资助项目(2012YQ04016411);国家自然科学基金资助项目(51121004).

作者：张蕾[1], 孙锐[1], 杨振[2], 彭江波[2], 回胜[3], 邹高鹏[1]

关键词： OH基, 绝对浓度, LIF, 双向光路法, 平面火焰, OH radical, absolute concentration, laser induced fluorescence(LIF), bidirectional optical path measurement, flat flame

中文摘要：

针对甲烷/空气预混气体层流平面火焰，利用LIF技术，采用双向光路法对燃烧过程中所产生的OH基进行了测量，得到其一维绝对浓度值及其空间分布，并分析其产生的动力学因素．结果表明，当量比为0.8～1.0范围内，OH基绝对浓度差别不大；当量比在1.1～1.3的范围内，OH基的绝对浓度呈下降趋势，一方面由于OH基消耗反应OH＋CH4→CH3＋H2O，随着CH4量的增大，OH基的消耗速度增加，另一方面OH基生成反应CH3＋O2→OH＋CH2O，虽然CH3不断生成，但由于O2的流量逐渐减小，所以OH基的生成率逐渐下降，二者共同作用导致OH基绝对浓度随着当量比的增大而减小．实验所测OH基绝对浓度值与Versluis等测得的OH基绝对浓度的数量级相差不大．

英文摘要：

Aiming at the structure of CH4/Air premixed laminar flat flame(LIF)and bidirectional optical pathwere used to measure the OH radicals formed during the combustion process,the absolute concentration and distributionregions of OH radicals were obtained,and the kinetics of the reaction were analyzed.The result showsthat when the equivalence ratio ranges from0.8to1.0,the concentration of OH is almost the same;when theequivalence ratio ranges from1.1to1.3,the concentration shows a decreasing trend.One reason is the OH consumptionreaction OH+CH4→CH3+H2O.With the increase of CH4concentration,the OH consumption velocityincreased.The other reason is the OH formation reaction CH3+O2→OH+CH2O.Although CH3was generatedcontinuously,the OH formation rate decreased gradually due to gradual decrease of O2mass flow.For both reasons,the OH centration decreased with the increase of equivalence ratio.The difference between the OH absoluteconcentration obtained in our experiments and that by Versluis was only an order of magnitude.