The aluminum agglomerate size distribution plays an important role in influencing the particle distributed combustion in motor, which subsequently affects the performance of solid rocket motor significantly. In this work, a three-phase model to describe distributed combustion of aluminum agglomerates is established based on the Eulerian-Lagrangian method. Then, the agglomerate size, including mono size and distributed size, is studied to reveal its effect on aluminum combustion and motor flow field. The simulated results indicate that the increasing agglomerate mono size observes the obvious decrease of the average temperature inside the motor combustion chamber, implying the low combustion efficiency of large agglomerate size. When considering the agglomerate size distribution, the size distribution mode and the mean size D43 determine the combustion efficiency together. In particular, even the mean size is similar, with different distribution mode, like skewed distribution, bimodal or trimodal distribution, the combustion efficiency and flow field parameters are nonnegligible different. However, when the size distribution mode is the same and the peak range is similar, the mean size D43 becomes the only and predominant factor as the mono size.

中文翻译：

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固体火箭发动机中具有团聚体尺寸分布的铝燃烧的数值研究


铝团聚体尺寸分布在影响发动机内颗粒分布燃烧中起着重要作用，进而显著影响固体火箭发动机的性能。在这项工作中，基于欧拉-拉格朗日方法建立了描述铝团聚体分布燃烧的三相模型。然后，研究了团聚体尺寸，包括单晶尺寸和分布尺寸，以揭示其对铝燃烧和电机流场的影响。模拟结果表明，团聚体单体尺寸的增加观察到电机燃烧室内平均温度的明显降低，这意味着大团聚体尺寸的燃烧效率较低。当考虑团聚体尺寸分布时，尺寸分布模式和平均尺寸 D43 共同决定了燃烧效率。特别是，即使平均大小相似，但分布模式不同，如偏态分布、双峰或三峰分布，燃烧效率和流场参数差异不可忽视。然而，当尺寸分布模式相同且峰值范围相似时，平均尺寸 D43 成为单色尺寸的唯一和主要因素。