Realization of a large-scale turbulence field in a small wind tunnel
Realization of a large-scale turbulence field in a small wind tunnel
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DOI：
10.1016/0169-5983(91)90030-m
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发表时间：
1991-10
影响因子：
1.5
通讯作者：
Makita Hideharu
中科院分区：
文献类型：
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作者：
Makita Hideharu
为了在小型风洞中产生大雷诺数R1和R λ的大尺度湍流，研制了一种主动式湍流发生器。在所得的均匀和准各向同性湍流中测量统计量。湍流强度高，积分尺度大，能谱具有约两个数量级的宽惯性子区。惯性子区的宽度接近网格雷诺数RM = 2.4× 106的网格湍流的宽度。在速度导数的波形中观察到细尺度湍流涡旋的间歇性。
An active turbulence generator was developed to generate a large-scale turbulence having large turbulence Reynolds numbers, R l and R λ, in a small wind tunnel. The statistical quantities were measured in the resultant homogeneous and quasi-isotropic turbulence. High turbulence intensities and large integral scales were attained in it. The energy spectrum had a wide inertial subrange of about two orders of magnitude in wavenumber. The width of the inertial subrange approached to that obtained for the grid turbulence having a far larger mesh Reynolds number of R M= 2.4× 10 6. Intermittency of fine-scale turbulent eddies was observed in the waveform of the velocity derivative.