动态作用下空化流动特性及流固耦合振动机理分析

项目名称： 动态作用下空化流动特性及流固耦合振动机理分析

项目编号： No.51306020

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 能源与动力工程

项目作者： 黄彪

作者单位： 北京理工大学

项目金额： 26万元

中文摘要： 流固耦合作用所引起的湍流及两相（空化）诱发振动机理逐渐成为空化研究最重要的科学问题之一。为满足水力机械学科发展和水力发电、机电排灌、航空航天以及水下兵器等工程领域的需求，申请者提出进行动态作用下空化流动特性及流固耦合振动机理分析。研究发展动态振荡作用下，非定常空化流场及振动多场实验技术，实现空穴形态、速度场、动态振荡信号的同步数据采集与处理分析；研究动态作用下，湍流的输运过程、空化的发展规律以及流动结构的时空分布之间的相互作用与影响；研究空化流动的涡动力学特征量与结构所受宏观动力的内在关系，以及由于流固耦合效应所导致的动力振动形式；重点研究空化状态下的流体与结构耦合的动力学建模问题；分析水动弹性耦合影响下的空化流动机理及流固耦合力学特性。

中文关键词： 非定常空化流动；流激振动；流固耦合；水弹性响应；振荡水翼

英文摘要： The mechanics of the turbulence instabilities due to vibration of the fluid-structure interaction and two-phase (cavitation) is one of the most important scientific problems of cavitation research. In order to address the key technologies related to the development of hydraulic machinery and pumping drainage and irrigation, hydrodynamics of submarine-based missile, the physics of fluid strcture interaction in unsteady cavitating flows with pitching motion is investigated via combined physical and numerical analysis. In experiments, a synchronous multi-physical field measurement with post-processing and analysis system of the experimental data is proposed to obtain the cavity shapes, velocity vector field and the dynamic vibrations. In order to better predict unsteady behaviors of cavitating flow with transient pitching motion, the focus will be on the dynamic fluid-structure interaction modeling. Combined experimental and computational modeling are applied to investigate the interplay between unsteady cavitation, turbulent transport, vortex dynamics, pitching motion and hydrodynamics, as well as the hydroelastic vibration due to the fluid and structure interaction.

英文关键词： Unsteady cavitating flow；Flow-induced vibration；Fluid Structure Interaction；Hydroelasticity；pitching hydrofoil