基于相场法的极地船舶结冰再辉过程模拟

Simulation of recalescence process of polar ship icing based on phase field method

极地船舶结冰是空气或海水中的过冷液滴落到船上后形成的。过冷液滴中的结晶核形成后,晶核进一步凝固放热使液滴温度重新回到凝固点并形成冰水混合物的过程被称为再辉,这是冻结阶段的开始。使用相场法,对不同过冷度下结冰再辉过程进行模拟,研究再辉后的结冰形貌和冰相比例。结果表明,过冷度对再辉结果有一定影响,再辉过程中的枝晶生长速度先快后慢,再辉结束后的冰相比例随过冷度增大而增大,过冷度从30K增至45K时,冰相比例从11.92%增至29.17%。

Polar ship icing is formed when supercooled droplets from the air or seawater fall onto ships.After the crystal nuclei in the supercooled droplet are formed,they solidify and release heat,so that the tempera⁃ture returns to the freezing point and forms an ice water mixture,which is called recalescence.This process is the beginning of the freezing stage.The phase field method was used to simulate the recalescence process of water under different undercooling conditions,and the icing morphology and ice-phase proportion after reca⁃lescence were studied.The results show that the undercooling has a certain effect on the results of recales⁃cence.The dendrite growth rate in the process of recalescence is fast at first and then becomes slow.The pro⁃portion of ice phase increases with the increase of undercooling.When the undercooling increases from 30K to 45k,the proportion of ice phase increases from 11.92%to 29.17%.