毕业论文移动版

摘要潜艇在水下航行过程中，会在其尾部留下较为明显的热尾流痕迹，而热尾流温度场的特征会受到海水温度、密度、盐度、潜艇航速、螺旋桨转速、排水温度、排水量以及常规动力潜艇的排气温度和排气量等因素的影响。此外，热尾流还可能会在海面上形成较为明显的冷斑，其所造成的海面红外辐射特性非常特别。本文建立了海面背景下潜艇热尾流温度场计算模型，主要从潜艇航速、螺旋桨转速、排水温度、排水量、排气温度及排气量几方面来数值模拟潜艇热尾流的流动。发现，潜艇航速、螺旋桨转速、排水量以及排气量对热尾流温度场影响较大，而排水温度和排气温度则并非主要因素。在距排水口较近的区域内，由于热水对海水放热，致使海水温度升高；后经螺旋桨扰动，对流换热迅速完成，尾部温度场主要呈现出螺旋桨的搅动作用；航速增加时，热尾流变得较为平缓，且浮升效应减弱；而排水量及排气量的增加，则会明显扰动热尾流温度场。84136

毕业论文关键词： 潜艇，热尾流，温度场，红外辐射，数值模拟

毕业设计说明书外文摘要

Title     The Simulation and Calculation of the Thermal  Wake Temperature Field of Submarine       

Abstract When the submarine sails underwater, it will leave an obvious trace of the thermal wake behind。 And the characteristics of the thermal wake will be influenced by the water’s temperature, density and salinity, speed of the submarine, the rotational speed of the propeller, the drainage temperature and displacement, the exhaust temperature and displacement of the conventional power submarine and so on。 Besides, the thermal wake may also form a relatively obvious cold spot on the sea surface, which results in a very special infrared radiation characteristics of the sea。 In this paper, the temperature field calculation model of submarine’s thermal wake in the sea surface background is established, and the flow of the thermal wake of submarine is simulated in several aspects, including the speed of the submarine, the rotational speed of the propeller, the drainage temperature and displacement, and the exhaust temperature and displacement, which shows that the speed of the submarine, the rotational speed of the propeller, the drainage displacement and exhaust displacement have a great influence on the thermal wake temperature field, while the drainage temperature and exhaust temperature have not。 In the area near the drain, the water is heated by hot water, which makes the sea water temperature rising。 After the propeller disturbance, the heat convection is completed rapidly, and the temperature field behind is mainly caused by the agitation of the propeller。 When the speed of the submarine increased, the thermal wake gets gentler, and the floating effect is weakened too。 With the increase of the drainage displacement and exhaust displacement, the thermal wake temperature field is obviously disturbed。

Keywords: submarine; thermal wake; temperature field; infrared radiation; numerical simulation

目   次

1  引言 1

1。1  研究背景 1

1。2  国内外研究人员主要研究方向与手段 1

1。3  研究内容 2

2  物理模型、网格划分、数值方法与边界条件 3

2。1  物理模型 3

2。2  网格划分 4

2。3  数值方法 5

2。4  边界条件 7

2。5  本章小结 8

3  无气泡热尾流模拟计算结果与分析 9

3。1  算例S-1的模拟计算结果与分析 9

3。2  算例S-2的模拟计算结果与分析 13

3。3  算例S-3的模拟计算结果与分析 17