实验流体力学2024，Vol.38Issue(2)：31-39,9.DOI:10.11729/syltlx20230137
密度分层介质中水下航行体绕流涡演化特性
Vortex evolution of the flow around an underwater vehicle in density-stratified flow
摘要
Abstract
Density stratification is a natural existing phenomenon observed in marine environ-ments.When underwater vehicles navigate near density stratification interface,the wake flow disrupts the initial stratification interface,resulting in a stratified wake.As one of the non-acoustic target features,stratified wake becomes a typical signal for underwater vehicle detection.To establish theoretic basis for wake flow detection in stratified environments,it is imperative to understand the characteristics of vortex generation and evolution around underwater vehicles in the density-stratified flows.This work focuses on the fine flow field around a SUBOFF scale model with full-appendage,by experiment and Large Eddy Simulation(LES)method,to figure out the characteristics of vortex evolution around the SUBOFF scale model in density-stratified flow.It is found that the mixing of saline water and fresh water in the wake displays multi-scale features,due to the strong unsteadiness of the separated vortices in the wake flow.The isolated and intensified vortex tends to evolve into a relatively regular configuration in the process of stratified fluid mixing,and causes this part of the fluid to detach from the primary interface,leading to a stratified interface with discrete characteristics in a given lateral range in the wake flow.Therefore,wake detection based on density gradients of the wake flow of an underwater target might be feasible.关键词
水下航行体/密度分层/尾流/大涡模拟/粒子图像测速/涡/SUBOFF模型Key words
underwater vehicle/density-stratified/wake flow/Large Eddy Simulation(LES)/Particle Image Velocimetry(PIV)/vortex/SUBOFF model分类
建筑与水利引用本文复制引用
张彬,周根水,高德宝,杜欣明,樊晓冰,刘建华..密度分层介质中水下航行体绕流涡演化特性[J].实验流体力学,2024,38(2):31-39,9.基金项目
国家自然科学基金项目(91952301,91852101) （91952301,91852101）
