自然通风变动风速时间尺度模型

NATURAL VENTILATION CHANGED WIND SPEED TIME SCALE MODEL

根据自然通风理论模型,结合自然风的Weibull分布特性,对适宜的室外变动风速条件时间间隔进行建模,定义为自然通风变动风速时间尺度模型。基于自然风的Weibull统计特性对自然通风的逐秒变动风速条件进行重构,并应用该风速序列近似代替实际自然风速条件;通过风洞实验结合数值模拟分析对该模型的有效性进行验证,并对该模型的实际应用进行分析。结果表明,自然通风变动风风速时间间隔宜随建筑进深的增加而增加,随开口面积比、逐时平均风速、进排风口风压系数差的增加而减小。

The time scale model of the natural wind speed was modeling according to the natural ventilation theory and the Weibull distribution characteristics of the natural wind. The wind boundary condition per second was reconstructed based on the Weibull distribution characteristics of natural wind speed. The model was verified by numerical simulation with wind tunnel experiment and the model practical application was analyzed. The result showed the time scale of natural wind speed should increase with increasing the depth of the building and decrease with increasing the open ratio, hourly-average wind speed and the difference of the wind pressure coefficient between inlet and outlet.