空气节流对乙烯燃料超燃冲压发动机流场结构影响研究  

Study on Flow Structure of an Ethylene-Fueled Scramjet Combustor with Air Throttling

作　　者：田野[1] 乐嘉陵[1] 杨顺华[1] 邓维鑫[1] 张弯洲[1] 

机构地区：[1]中国空气动力研究与发展中心吸气式高超声速技术研究中心,四川绵阳621000

出　　处：《推进技术》2015年第4期481-487,共7页Journal of Propulsion Technology

基　　金：国家自然科学基金(51376194;51376193)

摘　　要：空气节流可以有效地实现超燃冲压发动机燃烧室燃料的稳定燃烧,采用非定常数值模拟和地面试验研究了空气节流作用下乙烯燃料超燃冲压发动机的流场特性。结果表明:在燃烧室入口马赫数2、静温530K,静压0.1MPa,845mm处节流条件下,冷流流场达到稳定所需时间较短,约为2ms;在空气节流开始后的6ms注入燃料实现发动机的起动点火是合适的;28ms后燃烧流场稳定,流场呈现短周期的小幅振荡,周期约为0.86ms,振荡对流场的影响很小;壁面压力数据的数值模拟结果与试验结果匹配良好,数值模拟更加全面地给出了流场结构信息。Air throttling is an effective method to facilitate flame stabilization. Flow structure in an ethylene-fueled scramjet combustor is studied by solving unsteady N-S equations and experiment. Results show that under the inflow air condition Mach number 2.0,static temperature 530K,static pressure 0.1MPa,location of air throt？tling being 845mm from the entrance of the combustor,the cold flow field achieves stability. It is suitable for fuel injected into the scramjet at 6ms and the hot flow is steady at 28ms after air throttling starts. The flow field pres？ents small cyclical oscillation,which has a small effect on the flow field with the cycle time 0.86ms. The calculat？ing data of wall pressure match the experiment data well,and the flow structure is illustrated comprehensively with numerical methods.

关 键 词：超燃冲压发动机 空气节流 流场结构 振荡 

分 类 号：V235.213[航空宇航科学与技术—航空宇航推进理论与工程]