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首页> 美国卫生研究院文献>Journal of Visualized Experiments : JoVE >Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow
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Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow

机译：湍流应用中的三维粒子跟踪测速技术：喷射流的情况

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3D-PTV is a quantitative flow measurement technique that aims to track the Lagrangian paths of a set of particles in three dimensions using stereoscopic recording of image sequences. The basic components, features, constraints and optimization tips of a 3D-PTV topology consisting of a high-speed camera with a four-view splitter are described and discussed in this article. The technique is applied to the intermediate flow field (5 <x/d <25) of a circular jet at Re ≈ 7,000. Lagrangian flow features and turbulence quantities in an Eulerian frame are estimated around ten diameters downstream of the jet origin and at various radial distances from the jet core. Lagrangian properties include trajectory, velocity and acceleration of selected particles as well as curvature of the flow path, which are obtained from the Frenet-Serret equation. Estimation of the 3D velocity and turbulence fields around the jet core axis at a cross-plane located at ten diameters downstream of the jet is compared with literature, and the power spectrum of the large-scale streamwise velocity motions is obtained at various radial distances from the jet core.
机译：3D-PTV是一种定量流量测量技术，旨在使用图像序列的立体记录在三个维度上跟踪一组粒子的拉格朗日路径。本文介绍并讨论了由具有四视图拆分器的高速摄像机组成的3D-PTV拓扑的基本组件，功能，约束和优化技巧。该技术已应用于Re≈7,000的圆形射流的中间流场（5

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