【作者】 陈雄；

【导师】 韩玉阁；

【作者基本信息】 南京理工大学 ， 热能工程， 2018， 硕士

【摘要】 随着军用技术的发展,潜艇的非声探测原理及技术越来越受到重视,其中一种重要的探潜手段就是红外探潜。因此,潜艇海面尾迹的红外特征也随之成为越来越重要的研究方向之一。潜艇海面尾迹主要由潜艇航行时的水动力尾迹和热尾迹耦合作用而产生。本文针对潜艇的水动力尾迹和热尾迹耦合作用下海面红外特征进行数值分析。建立潜艇自航点分析模型,得到艇-桨复合潜艇基于自航点的水动力性能以及不同航速下推力阻力相等时的航行状态;研究不同航行状态对潜艇水动力尾迹和热尾迹发展的影响机理;并利用海浪谱生成随机海面,采用线性叠加原理获得潜艇随机海面背景下的尾迹特征,并研究其红外辐射特性,进行红外成像。具体内容主要如下:(1)基于船舶水动力学分析了潜艇主艇体的阻力值和螺旋桨的敞水性能,采用基于平板假设的经验公式验证了主艇体阻力预报的准确性,并给出了特定螺旋桨的推力转速方程。在考虑潜艇附加阻力以及推力减额的基础上,计算了不同进速系数下潜艇自航点,分析了不同潜深对自航点的影响。(2)在流动和传热耦合作用下,分别分析了潜艇位于温度均匀海水中和温度梯度海水中航行时的潜艇海面水动力尾迹和热尾迹。研究了水动力尾迹和热尾迹在不同潜深、航速、冷却水排放、螺旋桨转动等参数影响下的生成、发展和耦合机理,并对比分析了多种因素交叉影响下的海面尾迹特征。(3)在前人总结的海浪谱基础上,利用P-M(Pierson-Moskowitz)海浪谱获取了给定区域的随机海浪波高分布数据。利用线性叠加原理计算得到了随机海面背景下的潜艇海面尾迹。基于海面及目标红外计算理论分析了夜间潜艇近尾迹区域和中、远尾迹区域的红外特征,并进行红外成像。更多还原

【Abstract】 With the development of military technology,the principles and technology of non-acoustic detection of submarines are getting more and more attention.And the infrared detection is one of the most important means of submarine detection within them.Thus,the infrared characteristics of the submarine wake on the sea surface have become a more and more important research direction.The submarine wake is mainly caused by the coupling of the hydrodynamic wake and the thermal wake.In this paper,the numerical analysis of the infrared characteristics of the sea surface under the interaction of the hydrodynamic wake and the thermal wake coupling of a submarine is analyzed.The model analysis mainly includes three steps:a)Establishing the self-propelled point analysis model,getting the the composite submarine’s hydrodynamic performance and navigational states of equaling thrust and resistance in different speeds based on the self-propelled point;b)Studying on the mechanism of different navigation status effects on submarine hydrodynamic and thermal wake changes;c)Utilizing the spectrum of ocean waves to generate random sea surface and using the principle of linear superposition to obtain the wake characteristics of submarine random sea background,then studying on the infrared characteristic of the wake and generate the infrared image.The details are as follows:(1)The resistance value of submarine main body and the open water performance of propeller are analyzed based on ship hydrodynamics and the accuracy of the main body resistance prediction is verified by empirical formula based on flat plate hypothesis and then a thrust speed equation is given.Besides,the submarines’ self-propulsion points with different speed coefficients are calculated and the influence of different navigation depth on the self-propulsion points are analyzed on the basis of take the additional resistance of the submarine and the reduction of the thrust of the submarine into consideration.(2)The submarine’s hydrodynamic wake and thermal wake are analyzed under the coupling effect of flow and heat transfer when the submarine is sailing in uniform temperature and sea temperature.The generation,development and coupling mechanism of hydrodynamic wake and thermal wake under different parameters such as navigation depth,speed,cooling water discharge and propeller rotation are studied,and the wake characteristics of sea surface under the influence of various factors are compared and analyzed.(3)The data of the random wave height distribution of the given region are obtained by using the P-M wave spectrum on the basis of the wave spectrum summarized by the predecessors;then the wake of the submarine under the random sea surface background is obtained by using the linear superposition principle;finally,the infrared characteristics of the near,middle and the far wake region of the night submarine are analyzed based on the infrared calculation theory of sea surface and target,and the infrared imaging is carried out.更多还原