摘要
为了探究燃油喷雾空间分布对点火特性的影响,采用大涡模拟方法结合离散相模型、动态增厚火焰模型对轴径向旋流器燃烧室中的流动、燃烧过程进行模拟。结果表明:点火区域局部液滴质量浓度及高质量浓度分布范围决定了初始火核的生成、火焰的传播过程。尤其在火焰发展前期,空心锥形燃油喷雾火焰以周向和轴向传播为主,实心锥形燃油喷雾火焰则是周向、轴向和径向传播同时进行,并且不同喷射方式的燃油喷雾空间分布与稳定后的火焰形态相对应。用大涡模拟的方法再现了其他学者实验中观察到的燃油喷雾分布决定火焰分布的现象,同时也证明了仅靠索太尔平均直径(SMD)无法代表所有雾化特性对燃油喷雾燃烧过程影响的结论。
In order to investigate the effect of fuel spray spatial distribution on ignition characteristics,large eddy simulation method combined with discrete phase model and dynamic thickening flame model was used to simulate the flow and combustion process in the axial-radial swirler combustion chamber.The results showed that the local droplet concentration and distribution range of the high concentration in the ignition area determined the formation of the initial flame kernel and the propagation process of the flame.Especially in the early stage of flame development,the hollow conical fuel spray flame mainly propagated in circumferential and axial directions,while the solid conical fuel spray flame propagated in circumferential,axial and radial directions at the same time,and the fuel spray spatial distribution of different injection modes corresponded to the flame morphology after stability.The large eddy simulation method was used for the first time in reproducing the phenomenon that the fuel spray distribution determined the flame distribution observed in other scholars’experiments,proving that Sauter mean diameter(SMD)alone cannot represent all the effects of atomization characteristics on the fuel spray combustion process.
作者
李晶茹
黄勇
LI Jingru;HUANG Yong(School of Energy and Power Engineering,Beihang University,Beijing 100191,China;National Key Laboratory of Science and Technology on Aero-Engine Thermodynamics,Beihang University,Beijing 100191,China;Collaborative Innovation Center for Advanced Aero-Engine,Beijing 100191,China)
出处
《航空动力学报》
北大核心
2025年第6期209-217,共9页
Journal of Aerospace Power
基金
国家科技重大专项(2017-Ⅲ-0007-0032)。
关键词
大涡模拟
燃油喷雾空间分布
燃烧室
传播路径
雾化特性
large eddy simulation
fuel spray spatial distribution
combustion chamber
propagation path
atomization characteristic
