Isotropic turbulence apparatus with a large vertical extent
Isotropic turbulence apparatus with a large vertical extent
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大垂直范围的各向同性湍流装置
DOI：
10.1007/s00348-021-03311-7
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发表时间：
2021
影响因子：
2.4
通讯作者：
Eaton, John K.
中科院分区：
文献类型：
--
作者：
Hoffman, Davis W.;Eaton, John K.
摘要 开发了一种用于维持空气中近各向同性湍流柱的实验流动装置。四个合成射流致动器阵列沿着垂直塔的壁排列，产生在垂直方向上跨越 13 个完整长度尺度的均匀区域。使用光学测量技术量化各向同性、均匀性和各种湍流特性。在最高喷射功率设置下，均方根速度为 0.73 m/s，雷诺数为 240。尽管平均流量不可忽略，但考虑到测得的雷诺应力较小，它们对湍流动能产生的贡献微不足道。当比较纵向自相关函数时，流动表现出高度的各向同性，尽管根据均方根速度比在大尺度上观察到一些各向异性，在测量区域范围为 0.90 到 1.33。尽管与理想的各向同性湍流存在这些偏差，但实验设计非常适合重力沉降过程中惯性粒子团聚的研究。图形摘要
AbstractAn experimental flow facility for sustaining a column of nearly isotropic turbulence in air has been developed. Four arrays of synthetic jet actuators are arranged along the walls of a vertical tower, producing a homogeneous region spanning 13 integral length scales in the vertical direction. The isotropy, homogeneity, and various turbulence properties are quantified using optical measurement techniques. At the highest jet power setting, a root-mean-square velocity of 0.73 m/s and a Reynolds numberof 240 are attained. Although the mean flows are not negligible, their contribution to the turbulence kinetic energy production is insignificant, given the small magnitude of the measured Reynolds stress. The flow exhibits a high degree of isotropy when comparing the longitudinal autocorrelation functions, although some anisotropy is observed in the large scales according to the rms velocity ratio, which ranges from 0.90 to 1.33 over the measured regions. Despite these deviations from ideal isotropic turbulence, the experimental design is well-suited for the study of inertial particle agglomeration during gravitational settling.Graphical abstract
影响因子：
3.7
作者：
Good, G. H.;Ireland, P. J.;Warhaft, Z.
通讯作者：
Warhaft, Z.