研究动态自然风风向情况下的自然通风效果,对自然风基础数据进行长期实测,并分析自然风风向动态变化的特征.设计风向动态变化的风洞试验及CFD数值模拟分析,对非稳态自然风条件下的自然通风进行定量化研究,并定性解释不同建筑条件下的非稳态自然通风机理.结果表明:自然风风向在主导风向两侧±45°范围内随机振动,客观动态变化的自然风相对于假定的稳态自然风而言,打破了通风短路的情况,根据建筑条件不同,通风效果提高10％～ 50％.%Natural ventilation was studied considering fluctuating wind direction. A long-term field measurement offered rich fundamental data of wind and then the characteristics of wind direction were analyzed. Wind tunnel experiment in which the wind direction was fluctuating was carried out and unsteady CFD simulations were done as well. Both qualitative ventilation mechanism and quantitative ventilation performance were explained. It can be concluded that the wind direction fluctuates 5 degrees around the prevailing wind direction. Compared to the steady wind direction, the fluctuating wind can reduce the short circuit effect of ventilation and improve the ventilation efficiency by 10% to 50%.
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