椭圆形高耸结构的风压分布特性

Characteristics of Wind Pressure Distributions on Oval-Shaped High-Rise Structures

基于一标准椭圆形高耸结构模型的风洞试验结果,研究了风向角、测点位置及测点高度对模型表面的风压系数、风压系数功率谱及相干性的影响,得到了模型在长轴迎风时的漩涡脱落频率,并定义了模型在长轴迎风时迎风面、过渡区和背风面的分界点。利用经验公式拟合了典型测点的相干函数,计算结果表明椭圆形高耸结构在过渡区水平相干性最好,在曲率较大处竖向相干性最好,但水平和竖向相干性都比矩形结构差。

Based on the simultaneous pressure measurements of the rigid model of a standard oval-shaped high-rise structure model in a wind tunnel test, this thesis investigates the effects of wind direction and tests points’ position and height on the wind pressure coefficients, coherence functions and the power spectra of wind pressure. The author has obtained the fre-quency of vortex shedding at long axis wind direction, and defined the boundary points of windward facades, transition facades and leeward facades. The coherence functions of typical test points are fitted using the empirical formulas. The fitting results indicate that oval-shaped high-rise structures have good horizontal coherence at transition facades, and have good vertical coherence at big curvature areas, but have worse coherence than rectangular structures.