Persistent and frequent space explorations are limited by real-time parts supply and it is significant to achieve space manufacture, such as the droplet-based printing. In order to study the microgravity environment effect on droplet-based printing, this paper proposed an effective method to research the effect of space station environmental -jitter (according to NASA experimental signal) on droplet ejection and flight process. The heat transfer, transient gravity acceleration and Marangoni effect are studied based on the improved model. The results show that the -jitter is in the order of 10 magnitude and the effect on aluminum droplet ejection could be ignored when nozzle diameter () is smaller than 0.1 mm and so do ground case. Combined with the ground microgravity simulation of SnPb alloy lateral ejection experiments, it can be obtained that the ejected single droplet is characterized by capillary number (≤0.002), the droplet flight trajectory is dependent on the Froude number () and the laminar-turbulence transition exists during the droplet flight process. The relationship formulation between the deviation along gravity direction and the deposition distance is introduced to control and adjust the droplet flight trajectory. Moreover, the temperature effect on material property, such as surface tension and so on, has effect on the droplet breakup length. The -jitter field enhances the Marangoni effect resulting in the deviation of droplet trajectory. In microgravity field, the computational droplet oscillation period is well coincidence with theoretical equation. Improved KIC-SST based model is available for simulating droplet-based printing in microgravity.

中文翻译：

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微重力下铝液滴喷射和飞行的计算

持续频繁的太空探索受到实时零件供应的限制，实现空间制造（例如基于液滴的打印）具有重要意义。为了研究微重力环境对液滴打印的影响，本文提出了一种有效的方法来研究空间站环境抖动（根据NASA实验信号）对液滴喷射和飞行过程的影响。基于改进模型，研究了传热、瞬态重力加速度和马兰戈尼效应。结果表明，当喷嘴直径()小于0.1 mm时，β抖动约为10量级，对铝滴喷射的影响可以忽略不计，接地情况也是如此。结合SnPb合金横向喷射实验的地面微重力模拟，可以得出喷射的单个液滴以毛细管数（≤0.002）为特征，液滴飞行轨迹取决于弗劳德数（）和层流-湍流转变。存在于液滴飞行过程中。引入沿重力方向的偏差与沉积距离之间的关系公式来控制和调整液滴飞行轨迹。此外，温度对材料性能的影响，如表面张力等，也会对液滴破碎长度产生影响。抖动场增强了马兰戈尼效应，导致液滴轨迹发生偏差。在微重力场中，计算的液滴振荡周期与理论方程吻合较好。改进的基于 KIC-SST 的模型可用于模拟微重力下基于液滴的打印。