单体热射流水团浮升扩散规律研究

Study on the law of floating and diffusion of water mass of single thermal jet

水下航行体热射流排放可能会在水面上形成一定的红外特征,该红外特征会影响到其本身的隐身性能,因而研究热尾流的浮升扩散机理具有重要的意义。建立研究水下单体热射流水团浮升扩散规律的二维数学模型,利用Fluent软件对热射流浮升扩散规律进行二维数值模拟研究,利用SST k-omega湍流模型和有限体积法,得到单体热射流水团在水下浮升的浮升扩散规律及温度分布特性。利用该数学模型进一步研究对比初始速度的大小、方向及温差对单体热射流水团的浮升扩散的影响,分析得到单体热射流水团在几种因素影响下的温度分布规律及其运动轨迹。

The thermal jet emission of underwater vehicle may form certain infrared characteristics on the water surface,which will affect its stealth performance.Therefore,it is of great significance to study the buoyancy and diffusion mechanism of thermal wake.In this paper,a two-dimensional mathematical model is established to study the buoyancy and diffusion law of single thermal jet water mass.The two-dimensional numerical simulation of buoyancy and diffusion law of thermal jet water mass is carried out by using Fluent software.The buoyancy and diffusion law and temperature distribution characteristics of single thermal jet water mass are obtained by using SST k-omega turbulence model and finite volume method.By using this mathematical model,the influence of initial velocity,direction and temperature difference on the buoyancy and diffusion of single hot jet water mass is further studied and compared,and the temperature distribution and motion trajectory of single hot jet water under the influence of several factors are obtained.