基于Weibull统计特性的风速条件下的自然通风

NATURAL VENTILATION UNDER WIND SPEED CONDITION BASED ON WEIBULL STATISTIC CHARACTERISTICS

基于实际自然风风速的统计特性构造风速边界条件,并对该风速条件与建筑进深条件耦合作用下的自然通风效果进行研究。根据自然风的Weibull分布特征提出适用于建筑自然通风的小时时间尺度的风速序列构造方法,并结合实测自然风风速数据对该构造方法的有效性进行验证。根据全国多个城市典型气象年风速统计特征,构造3个小时时间尺度的变动风速条件。在PIV风洞实验验证基础上,以4栋不同进深的建筑为研究对象,应用LES模型对变动风速条件下的自然通风效果进行研究。结果表明:表征自然通风平均排热效果的时间加权平均温度T,与建筑进深呈对数趋势变化;空间平均温度与室外风速序列存在较强的负相关性,相关性随建筑进深的增加而加强。

Natural wind speed condition was constructed based on statistic characteristics and the natural ventilation effect under the changed wind condition and different depths of the buildings were studied. A method of changed wind speed series construction with hour time scale used in natural ventilation was proposed based on Weibull distribution feature of natural wind speed. The validity of the method was verified by comparing with real test data. Changed wind speed series with three hour time scale were constructed according to many city annual average wind speed distribution. The natural ventilation effect for four buildings with different depths under changed wind speed series with hour time scale was analyzed. The results show that the time-weighted average temperature is logarithmic to the depth of building. The time-weighted average temperature is negatively correlated with the outdoor wind speed and the relativity strengthens with the increase of the depth of the building.