Atmospheric wind field conditions generated by active grids
Atmospheric wind field conditions generated by active grids
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主动电网产生的大气风场条件
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
J. Peinke
中科院分区：
文献类型：
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作者：
P. Knebel;A. Kittel;J. Peinke
提出了一种用于产生多个旋转轴的主动网格，这些轴上的叶片可以通过步进电机或伺服电机驱动。研究了不同励磁方案对电网的影响。使用这种已经具有湍流间歇结构的协议，可以实现更高的间歇流动。这一概念也可以用来产生高湍流强度(>；25%)的湍流，其整体长度尺度超过风洞试验段的典型尺寸。对于高雷诺数流动，即大气边界层中的流动，可以再现由速度增量的间歇统计测量的类似的两点相关性。
An active grid for turbulence generation of several rotatable axes with surmounted vanes that can be driven via stepper or servo motors is presented. We investigate the impact of different excitation protocols for the grid. Using such protocols that already have the intermittent structure of turbulence, higher intermittent flows can be achieved. This concept can also be used to generate turbulent flows of high turbulence intensities (>25%) exhibiting integral length scales beyond the typical size of the test section of the wind tunnel. Similar two-point correlations measured by the intermittent statistics of velocity increments that are characteristic for flows of high Reynolds number, i.e. in the atmospheric boundary layer, can be reproduced.