结合风洞实验与热线测量，描述了阵风条件下的大尺度湍流结构

Li Weijun, Zhang Yang, Yang Bin, et al. large-scale turbulence structures in a laboratory-scale boundary layer under steady and gusty wind inflows. Scientific Reports, 2019, 9: 9373.

Experiments on turbulence structures and features of a wind field under steady inflow and gusty wind

inflows were implemented in a straight-through wind tunnel. Streamwise and wall-normal velocity

components were measured using a streamline constant temperature anemometer (streamline

CTA). Power spectra analyses revealed the existence of very large-scale motions (VLSMs) under both

steady and gusty wind inflows; but new gusty scale motions (GSMs) were revealed under only gusty

wind inflows. The GSMs might originate from an ordered external driving force that forces hairpin

packets to align coherently in groups with a length scale related to the gust inflow condition. The

streamwise wavelength of VLSMs is independent of inflow conditions, while the turbulent energy of

VLSMs is associated with the wall-normal height and local mean streamwise velocity. In particular,

the streamwise wavelength of GSMs increases linearly with the average value and period of sinusoidal

gusty wind inflows, and the turbulent energy of GSMs is sensitive to the wall-normal height and

all characteristic parameters of gusty wind inflows, including the average value, amplitude and

period. Considerable wall-normal airflows induced by gusty wind inflows were detected and these

are negatively correlated with the variation in gusty streamwise velocity, and root mean square

(RMS) values of the gusty wall-normal velocity tended to increase linearly with the average value and

amplitude of gusty wind inflows.

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