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Volumetric particle streak-tracking velocimetry and its application in indoor airflow measurements.

机译：体积颗粒条纹跟踪测速技术及其在室内气流测量中的应用。

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摘要

Based on existing PIV techniques and imaging principles of ordinary commercial cameras, a unique measurement method, Volumetric Particle Streak-Tracking Velocimetry (VPSTV), was successfully developed to measure all three spatial components of flow velocities simultaneously and partial-intrusively in a whole large 3-dimensional flow volume using ordinary light illumination. The VPSTV algorithm only requires two cameras to view the illuminated flow field and capture particle displacement images with the parallax effect. The technique can acquire three velocity components and flow directions in a 3-D volume, rather than a thin layer of a plane. A measurement system with associated software for indoor airflow studies was established based on the developed algorithm in a full-scale experiment room.;The VPSTV system consists of two sets of projector lamps offering volume illumination, a bubble generator seeding helium-filled soap bubbles of neutral buoyancy into the test room, two digital cameras in an angular oriented configuration with a synchronizer to trigger the two cameras, and a microcomputer with picture taking, image processing and data analysis software. The facility and hardware settings and operations, image and data processing procedures were formulated in consideration of satisfying cost-effectiveness and measurement accuracy. Methods for calibrating and validating the VPSTV system were established to improve and evaluate measurement accuracy of the system and to optimize some operating parameters with the help of theoretical analysis. Together with commercial software ImagePro Plus and Tecplot, an image and data processing software package, namely VPSTV-BEE, was developed and found to be both accurate and efficient.;The developed VPSTV system was applied in the measurements of airflow patterns and air distributions at three different levels of ventilation rate for each of two room layouts of an indoor ventilation system. This can be considered as an overall test of the system and the operating method. The airflow fields of the test cases were also simulated numerically using commercial CFD (computational fluid dynamics) software. Through a preliminary comparison between the results from the simulations and the experimental measurements, the performances of the different CFD models were evaluated.
机译：根据现有的PIV技术和普通商用相机的成像原理，成功开发了一种独特的测量方法，即体积颗粒条纹跟踪测速（VPSTV），可以同时并部分侵入性地测量整个流动速度的所有三个空间分量3使用普通光照明的三维流量。 VPSTV算法仅需要两个摄像机即可查看照明的流场并捕获具有视差效果的粒子位移图像。该技术可以获取3-D体积中的三个速度分量和流向，而不是平面的薄层。基于开发的算法，在大型实验室中建立了带有用于室内气流研究的相关软件的测量系统。VPSTV系统由两组提供体积照明的投影灯组成，一个气泡发生器播种氦气填充的肥皂泡。中性浮力进入测试室，两个角度定向配置的数码相机带有一个触发两个相机的同步器，以及一台带有拍照，图像处理和数据分析软件的微型计算机。考虑到满足成本效益和测量精度，制定了设施和硬件设置和操作，图像和数据处理程序。建立了对VPSTV系统进行标定和验证的方法，以提高和评估系统的测量精度，并借助理论分析来优化一些工作参数。与商业软件ImagePro Plus和Tecplot一起，开发了图像和数据处理软件包VPSTV-BEE，发现它既准确又高效。;已开发的VPSTV系统用于测量空气流模式和空气分布室内通风系统的两个房间布局中的每一个都具有三个不同级别的通风率。这可以视为对系统和操作方法的整体测试。还使用商用CFD（计算流体动力学）软件对测试用例的气流场进行了数值模拟。通过对仿真结果和实验测量结果之间的初步比较，评估了不同CFD模型的性能。

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  • 作者

    Sun, Yigang.;

  • 作者单位

    University of Illinois at Urbana-Champaign.;

  • 授予单位 University of Illinois at Urbana-Champaign.;
  • 学科 Engineering Agricultural.;Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2007
  • 页码 159 p.
  • 总页数 159
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 11:39:44

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