复杂条件下潜艇推进器流噪声高效数值预报研究

项目名称： 复杂条件下潜艇推进器流噪声高效数值预报研究

项目编号： No.51479029

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： 鲁建华

作者单位： 大连理工大学

项目金额： 80万元

中文摘要： 潜艇推进器流噪声数值预报是开发安静型潜艇的关键技术之一。目前关于潜艇推进器流噪声数值预报的研究多是假定推进器叶片为刚体、潜艇均速机动和空间声速为常数的条件，很少涉及叶片结构形变、潜艇变速机动及声速空间变化等更接近真实的复杂条件。鉴于此，本项目拟采用基于格子Boltzmann（LB）方法的数值模拟手段，对此类条件下潜艇推进器流噪声的产生传播机理进行研究。主要包括：构建能准确刻画此类条件影响的LB模型及边界处理格式，开发能实现上述LB模型的GPU-CPU异构计算机系统条件下的流噪声高效数值预报平台，并借此平台探究叶片结构形变、潜艇变速机动及声速空间变化对潜艇推进器流噪声远场声源强度分布、辐射方向、频率特性等的影响规律，分析这种条件下不同噪声源(单极子、偶极子和四极子等)对总体噪声的贡献。本项目研究可望为认识此类条件下水下流噪声产生传播机理提供合理高效的方法，为相应消声降噪技术提供理论支持。

中文关键词： 流固耦合；数值模拟；水下航行器；流噪声；格子Boltzmann方法

英文摘要： Numerical prediction on the flow noise from submarine propeller is one of the key techniques in developing quiet submarine. Most of the previous study on the issue is carried out by assuming the following conditions: the blade of the propeller is rigid, the submarine is maneuvered with constant velocity and the sound speed in the ocean is also constant. The following complex conditions are rarely involved, although they are closer to the real circumstance. They are: the blade of the propeller is flexible, the submarine is maneuvered with acceleration and the sound speed in the ocean is at least spatial variable. In this project, the numerical simulation method based on the lattice Boltzmann (LB) method is used to investigate the generation and propagation of flow noise from submarine propeller under such circumstance. The following issues are mainly included: propose proper numerical models and tools for implementation of the boundaries conditions based on LB method which can accurately describe the influence of the complex conditions on the flow noise; develop an efficient numerical platform of the flow noise prediction on the GPU-CPU heterogeneous computer systems; Investigate the influence of the complex conditions on the far field intensity distribution, the directivity, frequency pattern of the flow noise using this platform and analyze the contributions of different noise sources (monopole ,dipole and quadrupole) on the total noise. With this project, we hope we can provide an efficient reasonable method for numerical prediction of underwater flow noise under such complex conditions, and then a theoretical guidance for corresponding noise reduction methods.

英文关键词： Fluid-Structure Interaction;Numerical simulation;Underwater vechicle;Flow noise;Lattice Boltzmann method