密度分层对热射流流动的影响预测模型

Effect of density stratification on hot jet flow

为明确海水密度分层对水下航行体后方排出的热射流流动的影响,本文研究海水沿深度方向上温度和盐度对其密度的影响,进行了相关的数值模拟,并引入密度分层影响修正系数,对海水未密度分层时的数值模拟进行修正。研究结果表明,随着深度的增加,海水盐度上升,温度下降,密度变大。本研究拟合式的计算结果与数值仿真结果对比,误差在6%以内,且大部分数据点的误差都在1%以下,满足预测要求。

This study attempts to investigate the effect of seawater density stratification on the thermal jet flow behind the underwater vehicle.The effects of temperature and salinity on the density of seawater along the depth direction are studied,and the relevant numerical simulation is carried out,and the correction coefficient of density stratification effect is introduced to modify the numerical simulation of seawater without density stratification.Previous results showed that with the increase of depth,the salinity of seawater increases,the temperature decreases,and finally the density increases.Compared calculation results of fitting formula in this study to the numerical simulation results,the error of fitting formula is less than 6%,and the error of most data points is less than 1%,which meets the requirements of prediction.