某体育场悬挑屋盖表面脉动风压空间相关特性

通过对某体育场刚性模型进行同步风洞试验,得到了环状悬挑屋盖上、下表面的风压时程。考虑了涡旋脱落和再附着的影响,对悬挑屋盖各区域的典型测点进行时域下的相关系数和频域下的相干函数分析,总结了该体育场悬挑屋盖表面的平行来流方向、垂直来流方向排列的测点之间的相关系数及相干函数的规律。对相干函数曲线进行了拟合,得到了该体育场屋盖各区域相干函数公式及参数,与Davenport的经典相干函数相比,建立的相干函数与之形式一致、对悬挑屋盖的拟合精度更高。

Fluctuating Pressure Correlativity of Cantilevered Roof of a Stadium

The wind pressure time history records of the annular cantilever roof were obtained by the synchronous wind tunnel test on a rigid model of a stadium. Considering the influence of the vortex shedding, the correlation coefficient and coherence function of along wind and cross wind points were analyzed to get the characteristics of the external fluctuating pressure correlation of the stadium''s cantilever roof. The coherence function curves were fitted and the related coherence function was presented. Compared with the classical coherence function models, the present coherence function has the same form and a higher fitting accuracy for the cantilever roof.