泄爆外流场的可视化

通过实验和数值方法，对泄爆外流场进行了可视化研究。实验中采用YA-16高速阴影系统，拍摄了泄爆外流场的时序阴影照片。基于K-湍流模型和漩涡破碎（eddy dissipation）燃烧模型，利用同位网格SIMPLE算法，对泄爆过程进行了数值模拟。根据计算结果，由计算光学获得泄爆外流场的时序计算阴影图。实验阴影图与计算阴影图较一致，都形象地揭示了泄爆后湍流火焰的发展及二次爆炸的产生和变化过程。

Visualization of the external flow field in vented explosion

The vented external flow field was visualized using the experimental and numerical methods. The YA-16 high speed shadowgraph system was adopted in test to obtain the consequential clear shadowgraphs of the external flow field. And the explosion venting was simulated by the colocated grid SIMPLE scheme, based on the K-ε turbulence model and eddy dissipation combustion model. Based on the numerical results, the computational shadowgraphs were obtained through computational flow imagines (CFI). Comparisons of the computational shadowgraphs to the experimental shadowgraphs showed good agreement in trend. Both the experimental and the computational shadowgraphs visually demonstrated the development of the turbulent flame and the formation and development of the secondary explosion during venting.