摘要
对北京气象塔47 m高度处超声风速仪测得的强风样本进行了分析.结果表明:近地强风的湍流度和阵风因子较大,顺风向湍流度实测值大都在0.3以上,3个方向的湍流度有随着风速增大而减小的趋势.实测湍流积分尺度之比与Solari和Piccardo总结的经验公式有一定差别,顺风向湍流积分尺度与日本结构工程规范给定的结果相符.实测得到湍流功率谱密度与冯.卡门经验谱基本吻合,说明冯.卡门谱能够较好地描述北京城市地区近地强风的脉动风速谱特性.
This paper presented the analysis results of wind velocity data measured from an ultrasonic anemometer installed at the 47 m high location on the Beijing Meteorological Tower. The results have revealed that the turbulence intensity and gust factor of strong wind near ground are greater than normal. Most of the measured longitudinal turbulence intensities are greater than 0.3. The turbulence intensities at three directions are found to decrease with the increase of mean wind speed. There is a little difference between the ratio of turbulence integral length scale from field measurements and the value summarized by Solari and Piccardo, where the average longitudinal turbulence integral length scales accord with the Code of AIJ. The turbulence power spectra can fit Von Karman spectrum very well, thus illustrating that Von Karman spectrum is able to describe the energy distribution fairly well for the wind speed above the central district of Beijing.
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第2期8-12,共5页
Journal of Hunan University:Natural Sciences
基金
国家“985”工程资助项目
关键词
强风
湍流度
阵风因子
湍流积分尺度
功率谱
strong wind
turbulence intensity
gust factor
turbulence integral length scale
power spectra
