乙烯燃料超燃燃烧室燃烧流动过程的数值模拟  

Numerical Simulation of the Flow Process of Ethylene Fuel of Scramjet

作　　者：梁仍康 张云 李朗[1] 慎志豪 陈敬楠 LIANG Rengkang;ZHANG Yun;LI Lang;SHEN Zhihao;CHEN Jingnan(School of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621010,Sichuan,China)

机构地区：[1]西南科技大学土木工程与建筑学院,四川绵阳621010

出　　处：《西南科技大学学报》2022年第4期49-55,共7页Journal of Southwest University of Science and Technology

基　　金：中国空气动力研究与发展中心项目(20zh0093)。

摘　　要：采用壁面燃料喷射并结合凹槽结构作为火焰稳定机制是超燃冲压发动机燃烧室设计的理想方案。利用非定常方法研究了带凹槽的超燃冲压发动机壁面横向喷射乙烯燃料的火焰稳定过程,分析了不同当量比下的火焰稳定机制。结果表明:在燃烧室入口马赫数2、总温950 K、总压0.82 MPa条件下,冷流流场达到稳定所需时间约为9 ms;当凹槽台阶下游喷注当量比为0.1时,火焰稳定模式为燃料尾迹与凹槽共同形成的回流区稳定模式;当凹槽台阶下游喷注当量比为0.3时,火焰稳定模式为完全处于凹槽回流区稳定模式;当凹槽上游壁面喷注当量比为0.1时,火焰稳定模式为凹槽回流区稳焰模式;当凹槽上游壁面喷注当量比为0.3时,火焰稳定模式为射流回流区和凹槽回流区稳焰模式。Wall injection combined with cavity as flame stabilization mechanism is an ideal technology for scramjet design.The flame stabilization process of cross wall injection of ethylene fuel with cavity was studied and the flame stabilization mechanism was analyzed under different equivalent ratios.The results show that the inflow condition with Mach number 2,total temperature 950 K and total pressure 0.82 MPa,the time required for the cold flow field to reach stability is about 9 ms.When the downstream injection equivalent ratio(ER)of the cavity is 0.1,the flame stability mode is the reflux zone stability mode formed by fuel wake and cavity.When the downstream injection ER of the cavity is 0.3,the flame stability mode is completely in the backflow zone of the cavity.When the injection ER on the upstream wall of the cavity is 0.1,the flame stability mode is the flame stability mode in the backflow zone of the cavity.When the ER on the upstream wall of the cavity is 0.3,the flame stability mode is jet backflow zone and cavity backflow zone flame stability mode.

关 键 词：超燃发动机 凹槽结构 火焰稳定模式 数值模拟 

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]