亚/超临界环境下航天煤油液滴燃烧理论研究  

Study on Combustion Theory of Kerosene Droplets in Sub/supercritical Environments

作　　者：吴海龙 李飞晟 庞建国[1] 董夏斌 WU Haiong;LI Feisheng;PANG Jianguo;DONG Xiabin(Taiyuan Satellite Launch Center,Taiyuan 030001,Shanxi,China)

机构地区：[1]太原卫星发射中心,山西太原030001

出　　处：《上海航天（中英文）》2024年第2期145-153,共9页Aerospace Shanghai（Chinese&English）

摘　　要：目前大推力液氧煤油火箭发动机稳定工作时燃烧室达到超临界环境,而现有的液滴蒸发燃烧模型仅适用于亚临界环境,无法用于超临界环境。建立了亚/超临界环境下煤油液滴燃烧仿真计算模型,开展了亚/超临界环境下环境参数对煤油液滴燃烧特性的影响研究。结果表明:随着环境温度的升高,火焰温度大幅增加,着火时间、迁移时间和液滴寿命均缩短。随着环境压力的增大,煤油液滴燃烧的无量纲火焰半径减小,火焰温度小幅度增大,着火时间、迁移时间和液滴寿命均缩短。压力振荡环境下,煤油液滴燃烧的液滴蒸发速率、无量纲火焰半径和火焰温度随时间变化曲线的振荡频率与环境压力振荡的频率一致,火焰温度对环境压力振荡尤为敏感。When a high thrust liquid oxygen kerosene rocket engine operates stably,the combustion chamber reaches a supercritical environment.However,the existing droplet evaporation combustion model at present is only applicable to subcritical environments,and cannot be used in supercritical environments.In view of this,in this paper,a simulation calculation model is established for kerosene droplet combustion in sub/supercritical environments,and the effects of the ambient parameters on the combustion characteristics of kerosene droplets in sub/supercritical environments are studied.The results show that as the ambient temperature increases,the flame temperature increases significantly,and the ignition time,migration time,and droplet life all decrease.Besides,when the ambient pressure increases,the dimensionless flame radius of kerosene droplet combustion decreases,the flame temperature slightly increases,and the ignition time,migration time,and droplet life all decrease.In a pressure oscillation environment,the oscillation frequencies of the time dependent curves of the droplet evaporation rate,dimensionless flame radius,and flame temperature of kerosene droplet combustion are consistent with the oscillation frequencies of the ambient pressure,and the flame temperature is particularly sensitive to the ambient pressure oscillation.

关 键 词：亚/超临界环境 环境参数 液滴 燃烧 数值仿真 

分 类 号：TK49[动力工程及工程热物理—动力机械及工程]