RP-3航空煤油油气燃烧特性试验研究  

Experimental study on the combustion characteristics of oil and gas in a 20 L closed spherical tank

作　　者：王成[1] 李晓丽 宋诗祥 谷恭天 WANG Cheng;LI Xiaoli;SONG Shixiang;GU Gongtian(State Key Laboratory of Explosion Science and Safety Protection,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学爆炸科学与安全防护全国重点实验室,北京100081

出　　处：《安全与环境学报》2024年第9期3351-3359,共9页Journal of Safety and Environment

基　　金：国家自然科学基金创新研究群体项目(12221002)。

摘　　要：在20 L球形密闭罐内开展RP-3航空煤油油气燃烧试验,测定初始温度400 K、初始压力40~140 kPa、当量比0.7~1.5下RP-3航空煤油油气的火焰传播特性,分析了初始压力及当量比对火焰传播的影响,同时以点火位置为变量研究了火焰发展形态特征。结果表明:RP-3航空煤油的无拉伸层流火焰传播速度、拉伸层流火焰传播速度及层流燃烧速度随当量比增加呈先上升后降低趋势,在当量比为1.1时均达到最大值;随着初始压力的增大,三个速度相关的特征参数呈负相关变化;热扩散不稳定性及浮力不稳定性加剧了火焰面受到的流体动力学不稳定性影响,导致火焰不稳定性增强,在偏离中心点火位置时火焰面上产生了典型的细胞形状结构。The combustion test of RP-3 aviation kerosene vapor was conducted in a 20 L closed spherical tank.The flame propagation characteristics of RP-3 aviation kerosene vapor were investigated under initial temperatures of 400 K,initial pressures ranging from 40 kPa to 140 kPa,and equivalence ratios ranging from 0.7 to 1.5.The spherical flame method was used to calculate the propagation speed of unstretched laminar flames,the propagation speed of stretched laminar flames,and the laminar burning velocity under different operating conditions.The influence of initial pressure and equivalence ratio on flame propagation was analyzed,and the morphological characteristics of flame development were studied with ignition position as a variable.The results show that flames within the sphere progressively spread,with the radius of the flames continually expanding.The flame surface adjacent to the inner wall of the explosion sphere displays characteristic wrinkling.The unstretched laminar flame propagation speed,stretched laminar flame propagation speed,and laminar burning velocity of RP-3 aviation kerosene first increase and then decrease with the increase of equivalence ratio,reaching their maximum values at an equivalence ratio of 1.1.As the aviation kerosene combustion progresses from lean to rich fuel conditions,the flame development does not assume a perfectly symmetrical"n"shape,peaking at the 1.1 conditions,but displays greater speed and flame radius on the"left"side.As initial pressure increases,the unstretched laminar flame propagation speed,stretched laminar flame propagation speed,and laminar burning velocity of RP-3 aviation kerosene exhibit a negative trend.The flame color deepens with increasing density.Flame development at different ignition points displays similar patterns.The flame front divides the flow field into burned and unburned areas.As the flame front expands,thermal diffusion instability and buoyancy instability exacerbate the hydrodynamic instability affecting the flame surface,leading to enhanced flame

关 键 词：安全工程 RP-3 20 L密闭球罐 层流燃烧速度 影响因素 火焰不稳定性 

分 类 号：X934[环境科学与工程—安全科学]