潜艇水动力尾迹与热尾迹耦合作用的数值模拟

Numerical Simulation of the Coupling Effect of Submarine Hydrodynamic Wake and Thermal Trail

采用FLUENT中的VOF(Volume of Fluid Model)模型,对潜艇在海水有无温度梯度、有无螺旋桨转动和排放冷却水的情况下进行数值模拟,得到了潜艇在不同情况下冷却水的浮升规律,并分析了海面和其它截面的温度分布。计算结果表明:在温度均匀的海水中,潜艇静止悬浮比运动时热尾流浮升效果明显,且运动时螺旋桨的转动可加快热尾流的浮升;温度分层海水中,螺旋桨的转动作用可以把海水下层的冷水搅动翻滚至上层从而加剧了海面冷尾迹的形成。

Simulation of a submarine＇s temperature gradient under conditions of a rotating propeller and cooling-water discharge is reported through use of the VOF model in ANSYS FLUENT. The floating law of submarine cooling water under different operating conditions was verified, and the temperature distribution over the sea surface and other cross sections was analyzed. The results demon strate that thermal-wake fluctuation is obvious when static suspension of the submarine occurs under uniform temperature, and the rotation of the propeller was found to accelerate thermal-wake floating. When operating in temperature stratified seawater, the rotation of the propeller was found to stir cold water from the lower layers of the sea to upper layers, which in turn, was found to exacerbate the formation of the cold wake.