Untersuchung großskaliger Strömungsstrukturen in erzwungener und gemischter Konvektion mit der tomografischen Particle Image Velocimetry

Untersuchung großskaliger Strömungsstrukturen in erzwungener und gemischter Konvektion mit der tomografischen Particle Image Velocimetry
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粒子图像测速

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发表时间：
2011
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通讯作者：
M. Kühn
M. Kühn
中科院分区：
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文献类型：
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作者：
M. Kühn

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这篇实验性的论文涉及的发展和 应用层析成像粒子图像测速（层析成像PIV或 Tomo-PIV）系统，用于测量一立方米量级的体积 使用充氦肥皂泡作为示踪粒子。该系统允许 空气中大尺度流动结构的研究。相比于现有 层析PIV系统，适用于相当小的测量 体积，例如1 µm大油滴作为示踪颗粒， 所开发的系统具有几个具体特点。它们是由 肥皂泡的光学性质和 在摄像机观察方向的放大系数。在本文中， 表明，肥皂泡，尽管他们的光学特性， 在层析PIV中用作示踪粒子。为了实现这一目标， 开发了一套完整的层析PIV评价软件， 优化为快速和节省内存的评估大量的单一的 样品该算法的发展是详细讨论了在 论文此外，该系统的应用，在一个热流动 对流圈及实测流场的统计分析 显示了该系统测量三维的适用性 强迫对流和混合对流中的大尺度流动结构。比较 测量数据与平面PIV数据的比较表明， 特性对测量的准确性没有显著影响。 提供了断层PIV测量结果。
This experimental oriented thesis deals with the development and application of a tomographic particle image velocimetry (tomographic PIV or Tomo-PIV) system for measurement volumes of the order of one cubic metre employing Helium-filled soap bubbles as tracer particles. The system allows investigations of large-scale flow structures in air. Compared to existing tomographic PIV-systems, which are applied to rather small measurement volumes with e.g. 1 µm large oil droplets as tracer particles, the developed system has several specific characteristics. They are caused by the optical properties of the soap bubbles and the considerable change of magnification factor in cameras viewing direction. In the thesis, it is demonstrated that soap bubbles despite their optical characteristics can be used as tracer particles in tomographic PIV. In order to accomplish this a complete tomographic PIV evaluation software is developed, which is optimised for fast and memory-saving evaluation of a large amount of single samples. The development of the algorithm is discussed in detail in the thesis. Furthermore, the application of the system to the flow in a thermal convection cell and the statistical analysis of the measured flow fields shows the applicability of the system to measure three-dimensional large-scale flow structures in forced and mixed convection. The comparison of the measurement data to planar PIV data reveals that the identified characteristics have no significant influence on the accuracy of the presented tomographic PIV-measurements.