Large Eddy Simulation of the flame stabilization process in a scramjet combustor with rearwall-expansion cavity
Large Eddy Simulation of the flame stabilization process in a scramjet combustor with rearwall-expansion cavity
复制标题
后壁膨胀腔超燃冲压发动机燃烧室火焰稳定过程的大涡模拟
DOI：
10.1016/j.ijhydene.2016.09.012
复制
发表时间：
2016-11
影响因子：
7.2
通讯作者：
Zhang Yanxiang
中科院分区：
文献类型：
--
作者：
Wang Zhenguo;Cai Zun;Sun Mingbo;Wang Hongbo;Zhang Yanxiang
采用大涡模拟（LES）方法研究了带后壁膨胀凹腔的氢燃料超燃冲压发动机燃烧室火焰稳定过程。数值求解器首先验证了反应流，超燃冲压发动机燃烧室与后壁膨胀凹腔的情况下，数值结果与现有的实验数据吻合良好。研究了不同凹腔结构和当量比对火焰稳定过程的影响。结果表明，在燃烧过程中，放热最集中的区域均位于凹腔后壁附近。此外，大部分的热释放区域存在于超声速区，并与声速线相连。燃烧室内的火焰分布对当量比敏感，进一步减小当量比会形成细火焰。在相同当量比下，后壁较低的凹腔将延缓化学反应的发生，并在凹腔下游形成更集中、更强烈的放热区，加速化学反应的同时也实现了燃烧室内的充分燃烧。对于后壁膨胀凹腔，应结合凹腔结构和当量比来优化燃烧室的火焰稳定过程。
Large Eddy Simulation (LES) was employed to study the flame stabilization process in a hydrogen fueled scramjet combustor with a rearwall-expansion cavity. The numerical solver was first validated for a reactive flow, the scramjet combustor with rearwall-expansion cavity case, and the numerical results were shown in good agreement with the available experimental data. Effects of different cavity configurations and equivalence ratios on the flame stabilization process were then studied. It was found that during the combustion process, the most concentrated heat release regions are all located near the cavity rear wall. Besides, the majority of heat release regions are existed in the supersonic zones and attached to the sonic lines. The flame distribution in the combustor is sensitive to the equivalence ratio, and a thin flame would be formed when further decreasing the equivalence ratio. At the same equivalence ratio, the cavity with lower rear wall will delay the occurrence of chemical reaction and form a more concentrated and intense heat release region downstream the cavity, which will accelerate the chemical reaction and also achieve a sufficient combustion in the combustor. For the rearwall-expansion cavity, both the cavity configuration and equivalence ratio should be combined to optimize the flame stabilization process in the combustor.
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DOI：
10.2514/6.2012-947
发表时间：
2012-01
期刊：
--
影响因子：
--
作者：
Ryan T. Milligan;Jiwen Liu;Chung-Jen Tam;D. Eklund;M. Hagenmaier;D. Davis;D. Risha;M. Gruber;T. Mathur
通讯作者：
Ryan T. Milligan;Jiwen Liu;Chung-Jen Tam;D. Eklund;M. Hagenmaier;D. Davis;D. Risha;M. Gruber;T. Mathur
影响因子：
7.2
作者：
Wei Huang;Li Yan
通讯作者：
Wei Huang;Li Yan
影响因子：
3.4
作者：
Fureby, C.;Nordin-Bates, K.;Sabelnikov, V.
通讯作者：
Sabelnikov, V.
影响因子：
1.8
作者：
Greenshields, Christopher J.;Weller, Henry G.;Reese, Jason M.
通讯作者：
Reese, Jason M.
后壁膨胀腔超燃冲压发动机燃烧室燃料输送和混合过程的大涡模拟
影响因子：
3.5
作者：
Zun Cai;Xiao Liu;Cheng Gong;Mingbo Sun;Zhenguo Wang;Xue-Song Bai
通讯作者：
Xue-Song Bai