Airborne Hot‐Wire Measurements of the Small‐Scale Structure of Atmospheric Turbulence
Airborne Hot‐Wire Measurements of the Small‐Scale Structure of Atmospheric Turbulence
复制标题
大气湍流小尺度结构的机载热线测量
DOI：
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发表时间：
1971
期刊：
影响因子：
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通讯作者：
J. Lumley
中科院分区：
文献类型：
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作者：
C. M. Sheih;H. Tennekes;J. Lumley
本文介绍了小尺度大气湍流的实验研究。空中测量是在布鲁克海文国家实验室的气象塔附近进行的。热丝探针安装在切诺基飞机的右翼尖端。风速表信号经分化滤波后记录在飞机上的模拟磁带记录仪上；它们在实验室里用高速模拟-数字转换器进行数字化，并记录在磁带上。所有数据均用IBM‐360处理。利用快速傅立叶变换程序计算了光谱。由小尺度光谱计算得到的平均Kolmogoroff常数为α = 2.0。小尺度湍流的共谱和正交谱几乎为零。∂ui/∂x（速度矢量相对于飞机航向方向坐标的导数）的偏度和峰度分别从‐0.03到‐0.50和4.5到14，雷诺数（Rλ）从2280…
An experimental investigation of small‐scale atmospheric turbulence is presented. Airborne measurements were made in the vicinity of the meterological tower of Brookhaven National Laboratory. Hot‐wire probes mounted on the right wing tip of a Cherokee aircraft were used. The anemometer signals were recorded on an analog tape recorder in the aircraft after differentiation and filtering; they were digitized in the laboratory with a high‐speed analog‐to‐digital converter, and recorded on magnetic tape. All data were processed with an IBM‐360. A fast Fourier transform program was used to compute the spectra. The average Kolmogoroff constant computed from the small‐scale spectra was α = 2.0. The cospectra and quadrature spectra of the small‐scale turbulence were virtually zero. The skewness and kurtosis of ∂ui/∂x (the derivative of a velocity vector with respect to the coordinate in the direction of aircraft heading) ranged from ‐0.03 to ‐0.50 and from 4.5 to 14, respectively, at Reynolds number (Rλ) from 2280...