建筑结构学报2025，Vol.46Issue(6)：188-195,8.DOI:10.14006/j.jzjgxb.2024.0430
考虑突风效应的下击暴流风场特性试验研究
Experimental study on characteristics of downburst wind fields considering gust effects
摘要
Abstract
Downburst is a hazardous strong wind frequently occurring during thunderstorms,characterized by abrupt evolution and short duration.To investigate the influence of gust effect on downburst wind fields,this study employed an impinging jet test device with controllable outflow patterns to comparatively analyze the characteristics of steady-state and gust wind fields in downbursts.The results demonstrate that,in the high-velocity zone of near-ground downburst wind fields(z≤0.05Djet and 1.0Djet ≤ r≤1.5Djet,where r represents the radial distance from the jet center,z denotes the vertical height above ground,and Djet is the jet nozzle diameter),the influence of gust effects on maximum horizontal wind speed remains relatively small.Beyond this range,the maximum horizontal wind speed generally increases with gust frequency.When the gust frequency is low,the turbulence intensity distribution characteristics are close to the steady-state wind fields.However,as the gust frequency increases,the turbulence intensity gradually increases,with an increase of more than 0.2.Compared with the steady-state wind fields,the gust wind fields exhibit relatively small turbulence intensities at z＞0.15Djet.In high-frequency regions of gust wind speeds,the power spectral density follows Kolmogorov's'-5/3'law,with spectral characteristics showing insignificant variations across different gust frequencies and spatial positions.关键词
下击暴流/冲击射流/突风效应/风剖面/湍流特征Key words
downburst/impinging jet/gust effect/wind profile/turbulence characteristic分类
建筑与水利引用本文复制引用
方智远,杨泷筌,汪之松,黄汉杰..考虑突风效应的下击暴流风场特性试验研究[J].建筑结构学报,2025,46(6):188-195,8.基金项目
国家自然科学基金项目(52178455),河南省自然科学基金项目(232300420307),河南省高等学校重点科研项目(23A560003). （52178455）
