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首页> 外文会议>Selected Papers from the 9th International Symposium on Laser Techniques Applied to Fluid Mechanics Lisbon, Portugal, July 13-16, 1998 >II.3. PIV measurements of turbulence statistics in the three-dimensional flow over a surface-mounted obsatacle
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II.3. PIV measurements of turbulence statistics in the three-dimensional flow over a surface-mounted obsatacle

机译：II.3。在表面安装的障碍物上的三维流动中湍流统计的PIV测量

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The primary objective of this work is to show that Particle Image Velocimetry (PIV) can be used to provide reliable turbulence measurements in flows where homogeneous directions do not exist. As in any other measuring system based on sampling, the key to the usccess of such procedure lies in the acquisition of a statistically large number of samples. The use of compression of digital PIV images strongly facilitates this taks. In the present work, the flow over a surface-mounted cube is studied employing digital PIV. Turbulence data is computed by ensemble averaging, based on 2000 PIV images acquired at a frequency of 25-Hertz; Instantaneous views of the flow field provide additional information regarding large-scale dynamics of turbulent structures.
机译：这项工作的主要目的是证明可以使用粒子图像测速（PIV）在不存在均匀方向的流动中提供可靠的湍流测量。像在任何其他基于采样的测量系统中一样，成功实现此过程的关键在于统计上大量采样的获取。数字PIV图像压缩的使用极大地促进了这种工作。在当前工作中，使用数字PIV研究了表面安装的立方体上的流动。湍流数据是通过基于25赫兹频率采集的2000个PIV图像，通过集合平均计算得出的；流场的瞬时视图提供了有关湍流结构大规模动力学的其他信息。

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