月壤蓄热块增材制造中的热流固数值模拟

Thermal-fluid-solid Numerical Simulation of In-situ Additive Manufacture of Lunar Soil Thermal Storage Modules

中文关键词: 格子Boltzmann模型  固体颗粒  液滴碰撞  三相接触线

英文关键词: lattice Boltzmann model  solid particles  droplet impact  triple-phase contact lines

中文摘要:

      未来月球探索中，月壤原位3D打印的致密蓄热块是实现原位能源利用的重要途径。月壤中难熔固体颗粒会影响月壤的烧蚀融合，造成空隙缺陷，降低蓄热块的蓄热性能。本文采用三组分（固-液-气）固液相变的格子Boltzmann模型，研究了熔滴在固体颗粒上的沉积与凝固行为。模拟结果表明：颗粒在与熔滴接触后随即附着在熔滴表面，液滴周围的颗粒阻碍了液滴底部空气的排出，造成了不规则的三相接触线和不均匀的温度分布与热流密度分布，最终导致空隙的产生。为了实现致密蓄热块的原位3D打印，需要对月壤进行筛选与提纯的预处理，避免月壤中因固体颗粒造成的空隙缺陷。

英文摘要:

      In-sity 3D printing thermal storage modules of lunar soils is a significant method for energy utilization in future lunar exploration. Unmelted solid particles in lunar soils would affect the fusion of molten lunar soil, resulting in void defects and reducing the performance of thermal storage modules. In this paper, a molten droplet impact and solidification on solid particles are simulated using a triple-component (solid-liquid-air) solid-liquid phase change lattice Boltzmann model. Numerical results show that solid particles would adhere to the droplet surface after impacting. Particles around the spreading droplet hinder the air escaping from the droplet’s bottom surface, causing irregular triple-phase contact lines and non-uniform temperature distributions and heat flux distributions. For in-situ 3D printing dense thermal storage modules, it is necessary to do the pretreatment of lunar soils for screening and purification avoiding void defects caused by solid particles in lunar soil.