极地环境下圆管液滴撞击特性分析  

Analysis of droplet collision with circular tubes in polar environment

作　　者：于东玮 吴刚[3] 刘志兵[3] 纪杨 刘晨阳 韩雪阳 张大勇 YU Dong-wei;WU Gang;LIU Zhi-bing;JI Yang;LIU Chen-yang;HAN Xue-yang;ZHANG Da-yong(School of Ocean Science and Technology,Dalian University of Technology,Panjin 124221,China;Faculty of Vehicle Engineering and Mechanics,Dalian University of Technology,Dalian 116023,China;Marine Design&Research Institute of China,Shanghai 200021,China;South China Sea Scientific Experiment Center,Sansha 573199,China)

机构地区：[1]大连理工大学海洋科学与技术学院,辽宁盘锦124221 [2]大连理工大学运载工程与力学学部,辽宁大连116023 [3]中国船舶及海洋工程设计研究院,上海200021 [4]三沙市南海科学试验中心,海南三沙573199

出　　处：《船舶力学》2024年第8期1209-1220,共12页Journal of Ship Mechanics

基　　金：高技术船舶科研项目(CBG2N21-2-2);国家自然科学基金资助项目(52071055);中央高校基本科研业务费资助项目(DUT22QN237)。

摘　　要：覆冰是威胁极地环境下海洋工程装备上部设施安全运行的潜在危险,而液滴收集系数反映了结冰对象捕获过冷却液滴的有效程度,因而是覆冰生长预测的关键参数。本文采用欧拉法对颗粒两相圆柱绕流进行数值仿真,通过研究液滴的斯托克斯数(St)和液滴雷诺数(Rew)两个关键因素,对液滴运动轨迹的影响规律进行分析。研究发现,斯托克斯数对液滴运动轨迹影响明显,在St较大(St>1)时,收集系数完全取决于St,而Rew的影响较弱,随着Rew的增加,整体收集系数和局部收集系数缓慢减小;在St较小(0.26<St<1)时,随着Rew的增加,局部和整体收集系数显著减小;由于流体在圆柱下游形成漩涡,在St<0.26时具有更大的随流性,驱使液滴卷吸入圆柱尾部近壁区,甚至与圆柱后壁发生碰撞,使得局部和整体收集系数随Rew增加而变大。The icing problem seriously threatens the safety of ship navigation in the polar environment.The droplet collection coefficient is to determine how effectively a body collects water droplets and is the key pa⁃rameter for prediction of ice accretion.In this paper,the Euler method was used to numerically simulate the two-phase flow around a circular cylinder.Analysis of the influence on the trajectory of the droplet by study⁃ing the droplet Stokes number(St)and droplet Reynolds number(Rew).Research shows that St has a signifi⁃cant effect on the trajectory of droplets.When St is large(St>1),the collection coefficient depends entirely on the St,Rew influence is weaker,the total collection coefficient and local collection coefficient slowly decrease with the increase of Rew.When St is small(0.26<St<1),as Rew increases,the local and total collection coeffi⁃cients significantly decrease.Because the fluid forms a vortex downstream of the cylinder,it has a greater flow-following feature at St<0.26,driving droplet coiling to be sucked into the near-wall area at the end of the cylinder,even colliding with the back wall of the cylinder,such that the local and total collection coeffi⁃cients become larger with the increase of Re_(w).

关 键 词：极地 欧拉法 收集系数 数值模拟 圆柱绕流 

分 类 号：TK1[动力工程及工程热物理—热能工程] U6[交通运输工程—船舶与海洋工程]