摘要
风的湍流特性实测研究中常用两种分析方法:矢量法是水平风速风向由二维风速矢量表示,即自然风为纵向分量和横向分量的矢量和;标量法是水平风速用绝对风速和风向两个标量表示.由于对水平分量的定义差别,两种方法对应的湍流脉动特性分析结果(如平均风速、阵风因子、湍流度、功率谱密度和湍流积分长度等)不一致,将两种方法用于分析广东、上海、福建和江苏等地实测的四组脉动风速数据,结果证明不同的分析方法给统计结果带来差异,差异的大小随着风的脉动强度增大而增大.
Two methods are employed frequently to analyze the turbulence characteristics of wind. Vector method：horizontal wind velocity can be decomposed into two components as vector sum of longitudinal and lateral velocities. Scalar method： wind speed and direction can be considered as two variants of horizontal wind velocity. Due to the difference between the definitions of horizontal wind composites, results from the analysis of the turbulence characteristics （e. g. , mean wind speed, gust factor, turbulence intensity, power spectral density and integral length of turbulence） with these two different methods correspondingly fall into disagreement. Four groups of strong wind records field-measured in Guangdong, Shanghai, Fujian and Jiangsu are analyzed with the above two methods. The results demonstrate that different method leads to different statistical results. Such difference in turbulence characteristics will increase with turbulence intensity.
出处
《同济大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2006年第1期27-32,共6页
Journal of Tongji University:Natural Science
基金
国家自然科学基金资助项目(50178051)
关键词
脉动风速
湍流脉动特性
矢量法
标量法
fluctuating wind velocities
turbulence characteristics
vector method
scalar method
