| 摘要: |
| 对新型三维导流型凹槽的流动、燃料喷注、雾化、惨混及燃烧特征进行了初步研究, 并与传统二维结构凹槽的流动进行了对比。结果表明: (1) 与传统二维结构的凹槽相比, 导流型凹槽能够诱导较强的横向漩涡和湍流, 促进凹槽内部及凹槽与主流的动量、能量和质量交换, 从而增强超燃掺混和火焰稳定。但其效果随具体结构和流动条件存在差别。(2) 导流型凹槽在增强火焰稳定的同时加剧了凹槽内部的流动不平衡。这种不平衡对凹槽内部的燃油喷射及雾化有重要影响。应该在不同的凹槽结构和流动条件下合理设计并优化喷注方案。 (3) 计算中观察到由于凹槽附近剧烈的燃烧导致了局部回流。 |
| 关键词: 冲压喷气发动机 超音速燃烧 导流型凹槽+ 火焰稳定性 |
| DOI： |
| 分类号:V235.211 |
| 基金项目:国家自然科学基金 (90205004);国家“八六三”项目资助 (2002AA723061)。 |
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| Numerical investigation on combustion flow of a kerosene-fueled scramjet with 3D cavity (Ⅱ) Preliminary investigation on fuel/air mixing and flame stabilization enhanced by 3D cavity |
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HUANG Sheng-hong,XU Sheng-li,LIU Xiao-yong
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1.Dept.of Modern Mechanics, China Univ. of Science and Technology,Hefei 230026,China;2.The 31st Research Inst.,Beijing 100074, China
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| Abstract: |
| The flow,fuel injection,acomization,mixing and combustion characteristics of 3D cavity and a comparison with traditional 2D cavity were presented.The conclusions are as following: (1)Compared with traditional 2D configuration,3D cavity can promote its mass,moments and energy exchanges between cavity and primary flow by its intensified transverse vortex and turbulence,which contribute to a more enhanced fuel/air mixing and flame stabilizing,but the degree and mechanism of enhancement is different with structure and flow conditions.(2)3D cavity induces a higher degree of flow imbalance and unsteadiness in cavity,which has an important influence on fuel mixing and atomization.For better atomization and mixing,the injection should be optimized with the cavity structure and flow condition.(3)Local back flow of cavity’s hot gas in the upstream is observed in present reacting flow cases,which results from the increase of pressure,temperature in combustion state. |
| Key words: Ramjet engine Supersonic combustion 3D cavity Flame stability |
