Effect of geometric parameters on the drag of the cavity flameholder based on the variance analysis method
Effect of geometric parameters on the drag of the cavity flameholder based on the variance analysis method
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DOI：
10.1016/j.ast.2011.04.009
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发表时间：
2012-09
影响因子：
5.6
通讯作者：
Huang Wei;M. Pourkashanian;Lin Ma;D. Ingham;Shi-bin Luo;Zhenguo Wang
中科院分区：
文献类型：
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作者：
Huang Wei;M. Pourkashanian;Lin Ma;D. Ingham;Shi-bin Luo;Zhenguo Wang
壁腔已广泛用作超燃冲压发动机中的火焰稳定器，以延长燃料和空气在超音速流中的停留时间。这些装置提高了超燃冲压发动机燃烧室的燃烧效率，同时也对发动机施加了额外的阻力。本文应用二维耦合隐式NS方程、标准k-ε湍流模型和有限速率/涡耗散反应模型对带有空腔火焰稳定器的氢燃料超燃冲压发动机燃烧室的燃烧流场进行数值模拟。采用方差分析方法研究了上游深度、上游长度与上游深度之比、下游与上游深度之比以及扫掠角等几何参数对热流腔体火焰稳定器阻力的影响。结果表明，方差分析方法可以准确分析几何参数对腔体火焰稳定器性能的影响。长度与上游深度的比率以及下游与上游深度的比率对腔体火焰稳定器的曳力的影响是显着的，并且在考虑腔体火焰稳定器的设计时必须将它们放在首位。同时，当下游深度等于上游深度时，空腔火焰稳定器的阻力最大，并且随着长度与上游深度的比值增大，空腔火焰稳定器的阻力由负值变为正值。长径比较大的空腔火焰稳定器会给燃烧流场带来较大的阻力。
Wall cavities have been widely used as flameholders in scramjet engines to prolong the residence time of the fuel and the air in supersonic flow. These devices improve the combustion efficiency of the scramjet combustor, and also impose additional drag on the engine. In this paper, the two-dimensional coupled implicit NS equations, the standard k–ε turbulence model and the finite-rate/eddy-dissipation reaction model have been applied to simulate numerically the combustion flow field of a hydrogen-fueled scramjet combustor with a cavity flameholder. The effects of the geometric parameters, i.e. the upstream depth, the ratio of the length to the upstream depth, the ratio of the downstream to the upstream depth and the swept angle, on the drag force of the cavity flameholder for a heated flow are investigated using the variance analysis method. The obtained results show that the variance analysis method can be used to accurately analyze the effects of the geometric parameters on the performance of the cavity flameholder. The effects of the ratios of the length to the upstream depth and of the downstream to the upstream depth on the drag force of the cavity flameholder are substantial, and they must be foremost when considering the design of the cavity flameholder. At the same time, when the downstream depth is equal to the upstream depth, the drag force of the cavity flameholder is the largest, and on increasing the ratio of the length to the upstream depth, the drag force on the cavity flameholder varies from negative to positive. A cavity flameholder with a large ratio of the length to the upstream depth brings large drag force in the combustion flow field.