High Speed System for 3 dimensional measurement of velocity fields and particle or bubble trajectories

用于速度场和颗粒或气泡轨迹 3 维测量的高速系统

• 批准号: 444994527
• 金额: --
• 依托单位: Otto-von-Guericke-Universität Magdeburg
• 依托单位国家: 德国
• 项目类别: Major Research Instrumentation
• 财政年份: 2020
• 资助国家: 德国
• 起止时间: 2019-12-31 至 无数据
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/444994527?language=en
• 关键词: Speed; System; dimensional; measurement; velocity

The time-resolved determination of velocity fields is one of the most important research areas in the field of experimental fluid mechanics. Only recently the third dimension of the velocity vector has become accessible, since time resolved methods where point or 2D methods. Especially in turbulent flows, which represent most of the applications, a correct analysis of all three velocity components simultaneously and time-resolved, that means with high data rate, is crucial. Also in two-phase flows, the 3d knowledge of movement, trajectories and form of bubbles and particles is of great importance for the optimization of relevant applications as e.g. bubble columns. The requested system shall be used for this kind of problems. For this, several high-speed cameras are used from different angles to do tomographic particle image velocimetry or tomographic imaging of bubbles, particles and concentration fields, that are then reconstructed in the 3D volume. With this system, a multitude of different flow fields (mixing processes, separation processes, wind channel, water channel, bubble columns, pulsating flows, …) can be examined quantitatively in detail and in three dimensions with high acquisition frequencies.

速度场的时间分辨测定是实验流体力学领域最重要的研究领域之一。直到最近，速度矢量的第三维才变得可访问，因为时间分辨方法中的点方法或二维方法。特别是在湍流中，对所有三个速度分量的正确分析是至关重要的，这意味着要有高的数据率。此外，在两相流中，气泡和颗粒的运动、轨迹和形状的三维知识对于相关应用的优化非常重要，例如鼓泡塔。对于这类问题，应使用所请求的系统。为此，从不同的角度使用几个高速摄像机对气泡、颗粒和浓度场进行层析粒子图像测速或层析成像，然后在3D体积中重建。使用该系统，可以模拟多种不同的流场(混合过程、分离过程、风道、水道、鼓泡塔、脉动流、…)可以在高采集频率的情况下进行详细的三维定量检查。