RP-3航空煤油及其替代物液滴低压着火特性  

Droplet Ignition Characteristics of RP-3 Aviation Kerosene and Its Surrogate Under Sub-Atmospheric Pressure

作　　者：章洪涛[1] 何勇[1] 张金成 王智化[1] 岑可法[1] Zhang Hongtao;He Yong;Zhang Jincheng;Wang Zhihua;Cen Kefa(State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学能源清洁利用国家重点实验室,杭州310027

出　　处：《燃烧科学与技术》2022年第3期297-303,共7页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(51621005).

摘　　要：使用飞滴法对低压环境下RP-3航空煤油以及其二元替代物(体积分数80%的正癸烷和20%的1,2,4-三甲基苯)液滴的着火特性进行研究.液滴通过储油罐以及高温控压炉内的气压差推进并由平口针头产生,液滴在炉内自发着火并由高速相机记录其着火过程.实验结果表明,随着环境压力的降低,液滴的着火延迟时间呈指数型增加,而环境温度的增加会拓展RP-3煤油液滴的可燃压力极限,并缩短液滴的着火延迟时间,本文通过拟合获得液滴的着火延迟时间与压力及温度的关系式.液滴着火后,火焰增长率随着环境压力的降低而降低,火焰形态由半包火焰向尾部火焰转变.通过对比1100K环境下RP-3及二组分替代物液滴的着火过程,可发现两者的着火延迟时间随压力发展的趋势接近,但替代物由于缺乏大分子组分而更易着火,所以此二元替代物无法准确地预测RP-3航空煤油的着火过程.The free-falling droplet method was used to study the ignition characteristics of RP-3 aviation kerosene and its binary surrogate(80%n-decane and 20%1,2,4-trimethylbenzene)droplets under sub-atmospheric pres-sure environment.The droplets were propelled by the pressure difference in the liquid storage tank and the high-temperature pressure-controlled furnace and generated by the flat-necked needle.The droplets ignited spontane-ously in the furnace and the ignition process was recorded by a high-speed camera.The experimental results show that as the environmental pressure decreases,the ignition delay time of the droplets increases exponentially.The increase of ambient temperature will extend the combustible pressure limit of RP-3 kerosene droplets and shorten the ignition delay time.The fitting equation between the ignition delay time of the droplets and the pressure and temperature is calculated.After the ignition,the flame growth rate decreases as the ambient pressure decreases,and the flame shape changes from the half-envelope flame to the tail flame.By comparing the ignition process of RP-3 and the binary surrogate droplets under 1100K,it can be found that the binary surrogate and RP-3 kerosene droplets show similar development trends in ignition delay time,but the surrogate droplets are more prone to ignite because of the lack of macromolecular components.Therefore,the binary surrogate cannot accurately predict the ignition process of RP-3 aviation kerosene.

关 键 词：低压 着火特性 RP-3航空煤油 液滴燃烧 替代物 

分 类 号：TK401[动力工程及工程热物理—动力机械及工程]