液滴初始温度对RP-3航空煤油超临界蒸发特性的影响  

Influence of Initial Temperature of Droplet on Supercritical Evaporation Characteristics of RP-3 Aviation Kerosene

作　　者：靳乐[1] 范玮[1] 周舟[1] 张晋[1] 申帅[1] 

机构地区：[1]西北工业大学动力与能源学院,西安710072

出　　处：《燃烧科学与技术》2016年第3期269-275,共7页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(91441201;51376151);教育部博士点基金资助项目(20126102110029)

摘　　要：以超临界环境中RP-3航空煤油的悬停液滴为研究对象,实验研究了其在超临界温度下的蒸发特性受液滴初始温度的影响.通过分析不同初始温度下液滴的无量纲直径的平方、瞬态蒸发常数、液滴寿命和热膨胀率等参数的变化规律后发现,较高初始温度的液滴主要通过缩短初始加热时间来提高蒸发效率,当液滴初始温度从293.8,K升高至373.1,K时,3种不同环境压力下的液滴蒸发时间分别降低了31.55%,、32.25%,和34.73%,.此外,还发现液滴的初始温度越高,其出现超临界散射光斑时的液滴直径越大,出现时间越早.The influence of initial temperature of droplet on the evaporation characteristics of the RP-3 aviation kero-sene was experimentally studied.The variation of squared non-dimensional diameter,transient evaporation con-stant,droplet life,and thermal expansion ratio was explored in detail under different conditions.It is observed that evaporation efficiency is mainly improved by cutting down the heating time at the beginning for droplets of higher temperature.When the initial temperature of droplets is increased from 293.8 K to 373.1 K,the droplet evaporation time will be reduced by 31.55%,,32.25%,,and 34.73%, for three different ambient pressures,respectively.In addi-tion,it is also found that for droplets of higher initial temperature,the supercritical light-spot appears earlier on the droplets with a larger diameter.

关 键 词：RP-3航空煤油 超临界 蒸发 初始温度 

分 类 号：V312.1[航空宇航科学与技术—航空宇航推进理论与工程]