CAJ | 학술논문

液滴撞击是一个复杂的过程，溅射堆积与被抛射体的速度密切相关。在撞击过程中，除了可以观察到常见的一般溅射外，还经常可以观察到在撞击中心区域的强烈抛射现象，这些被强烈抛射的物体是如何产生并获得较大的抛射速度一直未能被清晰揭示。利用牛顿碰撞定律，研究了被抛射体获得较大抛射速度的一种途径，即撞击的对冲聚合效应。不考虑液滴撞击液面过程中的复杂动力学及热力学过程，将撞击对冲聚合过程简化为两次非弹性碰撞过程，建立了撞击对冲聚合模型。该模型非常简洁地得出了碰撞过程中的被抛射体的速度以及撞击过程中的总动能转化为热能的比率。由于天体撞击过程与液滴撞击过程具有一定的可比性，研究结果对于理解天体撞击抛射和撞击熔融现象非常有意义。
액적당격시일개복잡적과정，천사퇴적여피포사체적속도밀절상관。재당격과정중，제료가이관찰도상견적일반천사외，환경상가이관찰도재당격중심구역적강렬포사현상，저사피강렬포사적물체시여하산생병획득교대적포사속도일직미능피청석게시。이용우돈팽당정률，연구료피포사체획득교대포사속도적일충도경，즉당격적대충취합효응。불고필액적당격액면과정중적복잡동역학급열역학과정，장당격대충취합과정간화위량차비탄성팽당과정，건립료당격대충취합모형。해모형비상간길지득출료팽당과정중적피포사체적속도이급당격과정중적총동능전화위열능적비솔。유우천체당격과정여액적당격과정구유일정적가비성，연구결과대우리해천체당격포사화당격용융현상비상유의의。
Liquid droplet impact was complicated for its impact dynamics and thermodynamics. The shape of impact craters related to the velocity of impactors and the distribution of impact depositions dominated by the velocity of ejecta. However, the mechanism of ejecta getting velocity was still fuzzy. We deal with the collision and coalescence phenomenon to introduce a way to get ultra-high projection speed in impact event. By ignoring the complex physical process, we simplify the collision and coalescence as two inelastic collisions and make a model of collision and coalescence. Results show that we can get a rather high projection velocity even undergoing a large kinetic energy loss. Due to the similarity between cosmic impacts and droplet impacts, our model is benefit to understanding the phenomena of cosmic impact projections and fusions.