凹腔结构对氢气超声速燃烧影响数值模拟  

Numerical simulation of the effect of concave cavity structure on supersonic hydrogen combustion

作　　者：李素芬[1] 林姿含 东明[1] LI Sufen;LIN Zihan;DONG Ming(School of Energy and Power,Dalian University of Science and Technology,Dalian 116024,China)

机构地区：[1]大连理工大学能源与动力学院,辽宁大连116024

出　　处：《热科学与技术》2021年第4期395-402,共8页Journal of Thermal Science and Technology

基　　金：国家自然科学基金资助项目(51576027)。

摘　　要：基于开源计算软件OpenFOAM建立求解器,采用RANS方法,针对凹腔不同深度、长度、后壁面倾角对氢气在燃烧室中超声速燃烧进行数值模拟研究。分析比较了在燃料当量比为0.28时不同凹腔结构的速度场、温度场、燃烧效率和总压损失。结果表明:凹腔是燃烧室中主要蓄热和燃烧部分且不同凹腔结构的燃烧室流场边界层形状相似;凹腔长度影响燃烧室的总压损失,但是凹腔深度和后壁面倾角对其影响不大;凹腔的面积和长深比均可以影响燃烧室的燃烧效率,凹腔面积越大,燃烧效率越高,长深比为4.5左右时凹腔附近燃烧效率增幅最快。A solver was established based on OpenFOAM(Open Field Operation and Manipulation). RANS method was adopted to simulate the supersonic combustion of hydrogen in the combustion chamber with different depth, length and rear wall inclination of the concave cavity. The velocity field, temperature field, combustion efficiency and total pressure loss of different concave cavity structures were analyzed and compared when the fuel equivalent ratio was 0.28. The results show that the convace cavity is the main heat storage and combustion part in the combustion chamber, and the boundary layer shape is similar for the different cavity structure. The length of the cavity has large effect on the total pressure loss, while the depth of the cavity and the inclination of the rear wall have little effect on it. The area and length-depth ratio of the cavity can affect the combustion efficiency of the combustion chamber. The larger the area of the cavity, the higher the combustion efficiency. When the length-depth ratio is about 4.5, the combustion efficiency near the cavity increases the fastest.

关 键 词：OPENFOAM 超声速燃烧 凹腔 

分 类 号：V231.2[航空宇航科学与技术—航空宇航推进理论与工程]