The analysis presented in Part I of this study on the binary collision of equal molten calcium–magnesium– alumino–silicate (CMAS) droplets is extended to investigate the flow and interfacial dynamics of unequal CMAS droplet collision. Numerical investigations of head-on, off-center, and grazing collisions of two CMAS droplets of size 1 and 2 mm are conducted at pressure and temperature of 20 atm and 1548 K, respectively, that are representative of a gas-turbine combustor. At these conditions, the physical properties of CMAS are density, ρCMAS = 2690 kg/m , surface tension between CMAS/air, σCMAS = 0.40 N/m, and viscosity, μCMAS = 11.0 N-s/m . The primary difference between the CMAS and a fictitious fluid with viscosity 1/10 of CMAS was higher deformation for the lower viscosity case, leading to stretching and subsequent breakup of the liquid structure. These mechanisms are supported by the time evolution of surface, kinetic, and viscous dissipation energies.

中文翻译：

---

CMAS 液滴的二元碰撞——第一部分：等尺寸液滴

本研究第一部分对等量熔融钙镁铝硅酸盐 (CMAS) 液滴的二元碰撞分析扩展到研究不等量 CMAS 液滴碰撞的流动和界面动力学。分别在代表燃气轮机燃烧器的 20 个大气压和 1548 K 的压力和温度下，对两个尺寸为 1 和 2 mm 的 CMAS 液滴的正面、偏心和擦边碰撞进行了数值研究。在这些条件下，CMAS 的物理特性是密度，ρCMAS = 2690 kg/m，CMAS/空气之间的表面张力，σCMAS = 0.40 N/m，和粘度，μCMAS = 11.0 Ns/m。CMAS 与粘度为 CMAS 1/10 的虚拟流体之间的主要区别在于较低粘度情况下的变形更大，导致拉伸和随后的液体结构破裂。这些机制得到表面、动能和粘性耗散能的时间演变的支持。