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Dynamics of cavitation bubbles in compressible two-phase fluid flow

可压缩两相流体中空化气泡的动力学

基本信息

批准号：
171102419
负责人：
Dr. Thomas Kurz
金额：
--
依托单位：
III. Physikalisches Institut - Biophysik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2010
资助国家：
德国
起止时间：
2009-12-31 至 2015-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/171102419?language=en
关键词：
Dynamics cavitation bubbles compressible two

项目摘要

The primary objective of the project is to provide a better understanding of the damaging mechanism caused by the collapse of a single cavitation bubble near to a compliant wall. For this purpose, the equations for compressible two-phase flows (35) will be coupled with a system of partial differential equations modeling elastic-plastic behavior of the solid. In order to model phase transition effects and to take into account tiny bubbles forming during the bubble collapse that can not be resolved, the existing flow solver will be extended by a homogeneous description for two-phase mixtures. The experience of the French partners concerning homogenized models such as (40) will be used for the selection as well as for the implementation of such an ansatz.In the experimental part two problems will be considered; (i) pressure effects on bubble dynamics, and (ii) fluid-structure interaction. In part (i), bubbles in a heated liquid and bubbles driven by a sound field will be investigated by established methods. Also, laserinduced fluorescence shall be employed to visualize temperature variations in the liquid. In part (ii) a novel method to measure the time-dependent pressure load on the wall based on interferometry with short laser pulses shall be developed and furthermore extended to visualize stress states in a transparent solid as the boundary. It will be combined with the established experimental methods to obtain comprehensive experimental data on the bubble collapse near a wall.The experimental results will be used as a data base for comparison with numerical calculations.

该项目的主要目标是更好地了解在弯曲壁附近单个空化泡崩溃所造成的破坏机制。为此，可压缩两相流的方程（35）将与模拟固体弹塑性行为的偏微分方程系统相结合。为了模拟相变效应，并考虑在气泡崩溃过程中形成的无法解决的微小气泡，现有的流动求解器将被扩展为两相混合物的均匀描述。法国合作伙伴在（40）等同质化模式方面的经验将用于选择和实施这种分析。在实验部分将考虑两个问题；(i)压力对气泡动力学的影响，以及（ii）流固耦合作用。在第一部分中，加热液体中的气泡和声场驱动的气泡将通过既定的方法进行研究。此外，应采用激光诱导荧光来可视化液体中的温度变化。在第（ii）部分中，将开发一种基于短激光脉冲干涉测量法测量壁面上随时间变化的压力载荷的新方法，并进一步扩展到可视化透明固体作为边界的应力状态。将其与已建立的实验方法相结合，获得近壁气泡崩塌的综合实验数据。实验结果将作为与数值计算比较的数据基础。