水下航行体热尾流的扩散规律研究

Research on Evolution Mechanism of ThermalWake of Submerged Body

摘要:

基于mixture两相流模型,考虑热排气、冷却水与海水间的流动传热耦合机制,针对假定水下航行体模型和真实海况参数,对热排气热尾流、冷却水热尾流的浮升扩散特性以及海面的热特征进行了数值分析。结果表明:在航行体航线的垂向剖面上,热排气热尾流呈马蹄形扩散,冷却水热尾流呈水滴状扩散,该规律与文献理论和实验结果一致,很好地模拟了热排气、冷却水的海面热尾迹的形成过程。

Abstract:

On the basis of the mixture two-phase flow model, considering the couplingmechanism of heat transfer between hot exhaust gas, cooling water and seawater, thebuoyancy and diffusion law of the hot exhaust gas wake and cooling water wake as well asthe thermal signature on sea surface were numerically analyzed in the case of a real sea stateand a suppositional submerged body. The results show that the hot exhaust gas wakediffuses in a horseshoe shape and the cooling water wake diffuses in a droplet shape in thevertical profile of the navigation path. These characteristics are in accordance with thetheoretical and experimental results of the literature, proving that the formation process ofthe thermal wake on sea surface of the hot exhaust gas and cooling water are simulatedsplendidly.