基于间断迦辽金法的近场水下爆炸载荷特性研究

项目名称： 基于间断迦辽金法的近场水下爆炸载荷特性研究

项目编号： No.51479041

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 其他

项目作者： 姚熊亮

作者单位： 哈尔滨工程大学

项目金额： 84万元

中文摘要： 随着水下兵器精准度及威力的提升，舰船结构遭受近场水下爆炸毁伤的概率增加。近场水下爆炸中存在冲击波、气泡与边界的强烈耦合。冲击波使结构瞬间拥有极大速度并反射稀疏波形成空穴，改变结构附近的介质特征阻抗比，影响载荷特性；而气泡在受损结构构成的不连续边界附近会发生破碎及不规则射流。由此形成气液固三相耦合的复杂系统，存在强间断、大变形等强非线性问题，传统有限元法、边界元法在求解该问题时均面临巨大挑战。为此，本项目基于流固耦合基本理论建立近场水下爆炸动力学模型，联合间断迦辽金法和有限元法进行求解，研究气泡非线性大变形及空穴对载荷特性的影响，探索冲击波、空穴、气泡与边界的相互作用机理。主要研究内容包括：1)基于间断迦辽金法的三维近场水下爆炸模型；2)不连续边界附近气泡动态特性研究；3)计入空穴物态特性影响的近场水下爆炸载荷规律研究；4)空穴效应及不连续边界附近气泡动态特性实验研究。

中文关键词： 近场水下爆炸；载荷；气泡；空穴；间断迦辽金法

英文摘要： With the accuracy and power rising of underwater weapons, warship structures have large probability to be damaged by near-field underwater explosion. In the near-field underwater explosion, there is the strongly coupling between shock wave,bubble and boundary. Structure will have large velocity in moment impacted by the shock wave and reflect the rarefaction wave to form cavitation.The existence of cavitation will change the characteristic impedance of medium near the structure and affect the load characteristics.And the bubble near discontinuous boundary formed by damaged structure will be broken and generate irregular jet.Thus the complex system with the coupling between gas,water and solid is formed bringing a serious of nonlinear problem including strong discontinuity,large deformation and so on. To solve these problem, the tranditional finite element method and boundary element method will meet great challenge.Therefore, based on the fluid-strcuture theory, the dynamics model of near-field underwater explosion is established and solved with discontinuous galerkin method combined with finite element method.With the model,nonlinear large deformation of bubble and influence of cavitation on the load characteristics is researched. And the interaction mechanism between shock wave, cavitation, bubble and various boundaries is explored.The main research contents of the project include: 1) three-dimensional near-field underwater explosion model based on discontinuous galerkin method; 2) the study on dynamics characteristics of bubble near discontinuous boundary; 3) the study on load law of near-field underwater explosion considering cavitation state characteristics; 4) experiment for influence of cavitation effect and bubble dynamics near discontinuous boundary.

英文关键词： near-field underwater explosion;load;bubble;cavitation;discontinous galerkin method