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在高层建筑正压送风系统中,利用屋顶进新风来代替底部进风时,由于受到自然风的作用,屋顶表面处所产生的风压对正压送风系统会产生影响。本文利用风洞装置及简单的建筑模型,在不同的风入射方向及有(或无)女儿墙的条件下来确定屋顶表面的压力系数,同时利用发烟装置来观察气流的运动流型。根据实验结果给出了在各种条件下屋顶表面的压力系数(C_p)恒值线及气流流型,并指出了利用屋顶进风对正压送风系统运行可能产生失败的原因。
In a high-rise building’s positive pressure air supply system, when the roof enters the fresh air instead of the bottom air inlet, the wind pressure generated at the roof surface area will affect the positive pressure air supply system due to the natural wind. In this paper, using the wind tunnel device and a simple building model, the pressure coefficient of the roof surface is determined under different wind incident directions and with or without parapet walls. At the same time, the smoke flow device is used to observe the flow pattern of the air flow. According to the experimental results, the pressure coefficient (C_p) constant line and airflow pattern of the roof surface under various conditions are given, and the reason why the use of the roof inlet air to the positive pressure air supply system may fail to operate is given.