| 超声速气流中稳焰凹腔吹熄极限分析与建模 |
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| 引用本文： | 王振国,杨揖心,梁剑寒,孙明波,汪洪波,张泰昌.超声速气流中稳焰凹腔吹熄极限分析与建模[J].中国科学(E辑),2014(9):961-972. |
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| 作者姓名： | 王振国 杨揖心 梁剑寒 孙明波 汪洪波 张泰昌 |
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| 作者单位： | 国防科技大学航天科学与工程学院;高超声速冲压发动机技术重点实验室;中国科学院力学研究所;高温气体动力学国家重点实验室; |
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| 基金项目： | 霍英东教育基金会高等院校青年教师基金(批准号:131055)资助项目 |
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| 摘 要： | 吹熄极限的研究对于超燃冲压发动机燃烧室中稳焰凹腔和燃料喷注方案的设计具有重要学术意义和工程应用价值．针对凹腔上游喷注燃料的火焰稳定过程进行了研究，从理论上分析了超声速气流中凹腔稳定燃烧的贫燃与富燃吹熄机制，基于剪切层稳燃模式，进一步考虑流场的三维结构，并结合横向射流穿透与混合模型，在有效当量比的计算、凹腔的卷吸过程以及燃料射流与凹腔剪切层／回流区的质量交换等方面改进了已有模型，重新定义了与吹熄过程密切相关的Damokhler数和有效当量比，并以两者关系为准则建立了描述富燃和贫燃吹熄极限的数学模型，进而通过实验数据验证了模型的有效性．
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| 关 键 词： | 吹熄极限 凹腔 超声速气流 剪切层 横向射流 |
Analysis and modeling of blowout limits of cavity flame in supersonic flows |
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| Institution: | WANG ZhenGuo, YANG YiXin, LIANG JianHan, SUN MingBo, WANG HongBo ＆ ZHANG TaiChang (1.Science and Technology on Scramjet Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology Changsha 410073, China; 2.High Temperature Gas Dynamics Laboratory, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China) |
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| Abstract: | A comprehensive understanding of blowout limits of flames in Scramjet has great significance for design of the cavity configuration and injection scheme on academic and engineering fields. In this paper, the process of flame stabilization in the combustor with fuel injection upstream of a cavity was investigated. The physics mechanisms of lean and rich blowout were analyzed theoretically. Based on the shearlayer stabilization mode and three-dimensional flowfield structure, this paper combined the penetration and mixing model of transverse jet and other improved sub-models： the calculation of effective equivalence ratio, the entrainment process and the mass exchange between jet and shearlayer/recirculation zone, and then redefined Damokhler number and the effective equivalence ratio. With these two characteristic parameters, the criteria for blowout limits was mathematically modeled and verified by experimental data. |
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| Keywords: | blowout limits cavity supersonic flows shearlayer transverse jet |
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