冰脊对极地冰下航道流场特性影响研究

Influence of ice ridges on the flow field characteristics of the polar subglacial channel

冰脊是极地冰层下表面典型结构特征之一,掌握冰脊与冰下流场的相互作用规律,对于理解极地冰下航道适航特性及近冰面潜水器操纵运动具有重要的指导意义。为了探究冰脊对近冰面流场的影响及作用范围,本文基于极地实测数据建立五组典型分布间距冰脊流场,利用Fluent软件平台,通过稳态求解Reynolds应力方程模型(RSM)进行数值研究,重点分析冰脊间距对冰下流场特性的影响规律。同时,探究冰脊对冰下流场干扰的辐射深度。研究表明:连续冰脊对冰脊间尾涡具有拉伸效应;根据冰脊对冰下流场的干扰程度,辐射深度可分为强辐射区、稳定辐射区和无影响区三个区间。

Ice ridges are one of the typical features of polar ice underlying surface.Understanding the interac⁃tion between ice ridge and fluid flow is important for the navigation of submersibles.Five groups of typically spaced ice ridges were established based on the polar field data to investigate the influence of ice ridges on the fluid flow beneath the ice surface and its influence range.By solving the steady-state Reynolds stress equation model(RSM)through Fluent software,the effect of ice ridge spacing on fluid flow beneath the ice was studied.The relationship between spacing and wake vortex oscillation was explored.The radiation depth of ice ridge interference with the ice flow field was also studied.The numerical result shows that the continu⁃ous ice ridges have a tensile effect on the tail vortex.Depending on the level of interference,radiation depth can be divided into three ranges:strong radiation area,stable radiation area and no influence area.