自然风对正压送风系统屋顶进风效果的影响  

The Influence of the Natural Wind on the Efficiency of Roof Level Intakes for Pressurization Systems

作　　者：熊洪[1] Eric W.Marchant 

机构地区：[1]中国建筑科学研究院防火部 [2]英国爱丁堡大学防火工程系

出　　处：《建筑科学》1992年第2期37-41,共5页Building Science

摘　　要：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。The roof level intakes for pressurization systems are described as an alternative to the low level intakes in the design code. The wind induced pressures on a roof may reduce the efficiency Of a pressurization system. A simple model building was used to determine the pressure coefficients on the roof surface (at the location of an air intake) for several wind directions and with or without a partial parapet. The model was placed in an open jet wind tunnel for the measurement of pressures and the observation of flows. Pressure coefficient contours are presented and the results indicate the possibility of a complete failure for both positive and negative induced wind pressures. However, it is indicated also that the performance of a pressurization system is very tolerant to changes in the wind induced pressures.

关 键 词：屋顶 送风系统 自然风 高层 建筑物 

分 类 号：TU973.213[建筑科学—结构工程]