Effect of reactive gas mixture distributions on the flame evolution in shock accelerated flow
Effect of reactive gas mixture distributions on the flame evolution in shock accelerated flow
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反应气体混合物分布对冲击加速流火焰演化的影响
DOI：
10.1016/j.actaastro.2020.11.026
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发表时间：
2021-02
影响因子：
3.5
通讯作者：
Gao Longkun
中科院分区：
文献类型：
--
作者：
Zhu Yuejin;Gao Longkun
基于单步化学Navier-Stokes方程，对c2h4 / 3o2 / 4n2混合气体激波加速流动中的火焰演化进行了数值研究，并通过新鲜反应气体质量分数的变化模拟了四种不同的反应气体混合分布。反应气体混合物的量从情形1到情形4依次增加，燃烧强度也依次增加。研究发现，不同的反应气体混合分布对激波加速流动中的火焰演化有显著影响。在病例1和2中出现了明显的冲击分岔。在情况1中，顶部和底部的激波分岔结构基本对称，约为0.038 m，但在情况2中，由于顶部激波分岔区的火焰更接近分岔激波，因此分岔结构之间的对称性被破坏。对于情形3和情形4，出现了一个起爆过程，起爆的地点和时间在每种情况下都是不同的。情形3和情形4的爆震波传播过程和最终形态也不同。从定量分析来看，从情形1到情形4，火焰面积和总放热率都有所增加，特别是在反射激波后的时间段内。此外，在反射激波与变形火焰相互作用之前，混合速率从情形1到情形4有所增加。在情形3和情形4中，由于出现爆轰，混合速率急剧下降。
Flame evolution in shock accelerated flow is studied numerically for an C2H4/3O2/4N2gas mixture based on the Navier-Stokes equations with a single-step chemistry, and four different distributions of the reactive gas mixture are modelled by the variation of the mass fraction of the fresh reactive gas. The amount of reactive gas mixture increases from case 1 to case 4, and the combustion intensities also increase sequentially. It can be found that the different reactive gas mixture distributions significantly affect the flame evolution in shock accelerated flow. A distinct shock bifurcation emerges in cases 1 and 2. The top and bottom shock bifurcation structures are basically symmetrical abouty= 0.038 m in case 1, but the symmetry between the bifurcation structures is destroyed in case 2 because the flame in the top shock bifurcation zone is closer to the bifurcated shock wave. For cases 3 and 4, a detonation process emerges, and the location and time at which the detonation is initiated vary in each case. The propagation process and final morphology of the detonation wave are also different in cases 3 and 4. From the view of quantitative analyses, the flame area and total heat release rate increase from case 1 to case 4, especially for the time period behind the reflected shock wave. Additionally, the mixing rate increases from case 1 to case 4 before the reflected shock wave interacts with the distorted flame. The mixing rate then decreases sharply in cases 3 and 4 due to the emerging detonation.
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