The application of a 3D PTV algorithm to a mixed convection flow
The application of a 3D PTV algorithm to a mixed convection flow
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DOI：
10.1007/s00348-002-0513-9
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发表时间：
2002-10
影响因子：
2.4
通讯作者：
R. Kieft;K. Schreel;van der Gaj Gert Plas;C. Rindt
中科院分区：
文献类型：
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作者：
R. Kieft;K. Schreel;van der Gaj Gert Plas;C. Rindt
本文应用三维粒子跟踪测速（PTV）算法对加热圆柱尾流进行了研究。该方法在其准确度和性能方面进行了预先测试。在精度测试中，测试了其在3D空间中定位粒子的能力。看来，该算法可以确定颗粒的位置，精度小于0.5相机像素，相当于0.3毫米，在目前的测试情况。性能测试表明，对于二维平面内的粒子，该算法能够以100%的矢量产率跟踪粒子，几乎可以为所有检测到的粒子确定速度矢量。在这种情况下计算的速度矢量的标准偏差小于1%。还测试了在加热圆柱体后面的混合对流流动的性能，其中2D流动转变为3D流动。由于没有精确的解决方案，这样的流动，3D PTV结果与可视化结果进行了比较。结果表明，三维PTV方法能较好地捕捉到二维涡街三维转捩的主要特征。
A 3D particle-tracking velocimetry (PTV) algorithm is applied to the wake flow behind a heated cylinder. The method is tested in advance with respect to its accuracy and performance. In the accuracy tests, its capability to locate particles in 3D space is tested. It appears that the algorithm can determine the particle position with an accuracy of less than 0.5 camera pixels, equivalent to 0.3 mm in the present test situation. The performance tests show that for particles located in a 2D plane, the algorithm can track the particles with a vector yield reaching 100%, which means that a velocity vector can be determined for almost all particles detected. The calculated velocity vectors for this situation have a standard deviation of less than 1%. The performance is also tested on a mixed convection flow behind a heated cylinder in which the 2D flow transits into a 3D flow. As there is no exact solution of such a flow available, the 3D PTV results are compared with visualisation results. The results show that the 3D PTV method can capture the main features of the 3D transition of the 2D vortex street.