论文标题
通过通过冲击波加热的铝液滴汽化速率的模拟衍生的替代模型
A simulation-derived surrogate model for the vaporization rate of aluminum droplets heated by a passing shock wave
论文作者
论文摘要
冲击流中铝液滴的蒸发速率在确定铝制能量材料的燃烧过程中的能量释放速率中起着至关重要的作用。在本文中，在数值上研究了冲击流中铝液滴汽化的物理学。从基于仿真的数据开发出时间平均的舍伍德号和努塞尔的替代模型，作为冲击马赫数和雷诺数的函数。结果表明，与雷诺数的雪木数和液滴的努塞尔数单调增加。另一方面，舍伍德数和努塞尔特数字表现出非单调的行为，由于冲击后震后从亚音速速度到超音速速度的过渡，随着冲击马赫数从1.1增加到3.5，冲击马赫数增加。与文献中的可用模型相反，这些模型通常用于铝液滴蒸发的过程规模计算，当前的舍伍德数和努塞尔特数字的模型适用于雷诺数的广泛范围，并且将在雷诺数字和马赫数中有用，并且将在宏观尺度的多相模拟中有用。
The vaporization rate of aluminum droplets in shocked flows plays a crucial role in determining the energy release rate during the combustion of the aluminized energetic materials. In this paper, the physics of the vaporization of aluminum droplets in shocked flows is numerically investigated. Surrogate models for the temporally averaged Sherwood number and Nusselt number, cast as functions of shock Mach number and Reynolds number, are developed from the simulation-based data. The results show that the Sherwood number and the Nusselt number of the droplet increase monotonically with the Reynolds number. On the other hand, the Sherwood number and the Nusselt number exhibit non-monotonic behavior with increasing shock Mach number due to the transition of the post-shock flow from subsonic to the supersonic speeds as the shock Mach number is increased from 1.1 to 3.5. In contrast with available models in the literature that are commonly used in process scale computations of aluminum droplet vaporization, the current models for the Sherwood number and the Nusselt number are applicable over a wide range of the Reynolds number and the Mach number and will be useful in the macro-scale multi-phase simulations of the combustion of aluminumized energetic materials in high-speed flows.
