室外风场对庭院建筑热压通风的影响

Influences of Outdoor Wind field on the Thermal Natural Ventilation in Courtyard Buildings

针对具有一定内热源的庭院建筑,采用计算流体力学(CFD)方法,分析了热压自然通风量与庭院内热源和室外风向、风速的关系.结果表明房间的通风量随室外风速、风向的变化而变化,且热压对通风的相对影响作用随室外风速的增大而减弱.在对庭院式建筑进行自然通风系统设计时,这一结论可作为理论设计依据之一.

The computational fluid dynamic （CFD） method is employed for simulating the flow field of .a courtyard building with inside heating sources, and the relationships between the flow rate, which coursed by thermal pressure, and the outside air speed and wind direction are discussed and analyzed. The result shows that both speed and direction of the wind affect the ventilation rate, and the effect of the thermal natural ventilation become weaken with the increase of the outside wind speed. This feature should be taken into consideration in the design of the natural ventilation system in courtyard buildings.