摘要:
采用尖劈、格栅和粗糙元组合的被动湍流发生装置在TJ-2风洞中模拟了大气边界层流场,测量了模拟流场的平均风速剖面,湍流度剖面,湍流积分尺度和脉动风速功率谱等风场特性参数,重点分析了风速的竖向空间相干曲线.针对风速竖向空间相干曲线存在低频"掉头"的现象,给出了修正的指数衰减函数来进行拟合,完善了用传统的简化指数衰减函数来进行拟合时在低频处的不足,结果表明:笔者给出的风速竖向空间相干函数拟合效果更好.
Abstract:
Atmospheric boundary layer flow field was simulated in TJ-2 wind tunnel by using the passive turbulence devices composed of spires,grid and roughness components.The wind filed parameters,including mean wind velocities profile,turbulence intensity profiles,turbulence integral scale,wind spectrum and so on,were measured.The vertical spatial correlation curves of wind velocities were analyzed on focus.Aiming at the phenomenon of low frequency "turns around"in the vertical spatial correlation curves of wind velocities ,the revised exponential decay functions were put forward to fit it,which improves the shortage of traditional simplified decay exponential function in low frequency.The result shows the revised vertical spatial correlation functions of wind velocities proposed by the author are more precise.
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