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基于可移动双坡屋面实验房及测风塔获取的“苏迪罗”、“彩虹”、“凯萨娜”和“芭玛”等台风登陆期间的三维脉动风速数据,对近地边界层平均风特性和湍流特性进行分析。分析结果表明:近地100m范围内平均风速剖面符合对数律和指数律分布,平均湍流度剖面符合指数律分布;与良态季风条件下相比,摩擦速度、地面粗糙度长度、平均风速剖面指数α值相对变大,平均湍流度相对增大20%以上;湍流度与阵风因子相关性与Ishizaki实测结果一致;纵向、横向和竖向三湍流分量的竖向相干函数衰减指数为16.82、7.23、3.69;离地3.2m高度处各向湍流分量的功率谱值大于10m高度功率谱值2倍以上,在低频范围各向湍流分量含能量相对要大,湍流功率谱高频段下降相对较快,在惯性子区各湍流分量的功率谱的分布显著偏离“Kolmogrove-5/3”律。
The three-dimensional fluctuating wind speed during typhoon landed, such as “Sudiro”, “Rainbow”, “Cassana” and “Parma”, obtained by the mobile double-slope roof laboratory and the tower Data, the average wind and turbulence characteristics of the near-Earth boundary layer are analyzed. The results show that the average wind speed profile in 100m range complies with logarithm law and exponential law distribution, and the mean turbulence profile accords with the exponential law distribution. Compared with the good monsoon condition, the friction velocity, ground roughness length, average wind speed profile The index α is relatively larger and the average turbulence is increased by more than 20%. The correlation between turbulence and gust factor is consistent with that of Ishizaki. The vertical coherence function attenuation index of vertical, horizontal and vertical turbulence components is 16.82 and 7.23 , 3.69; the power spectral value of the turbulent component of each direction at the height of 3.2m from the ground is more than 2 times the power spectrum value of the height of 10m, the energy content of the turbulent component in each direction is relatively large in the low frequency range, The distribution of the power spectrum of each turbulence component in the inertial zone deviates significantly from the “Kolmogrove-5/3 ” law.