低温地板辐射采暖室内颗粒物分布模拟研究

Simulation of Indoor Particulate Matter Distribution in Low Temperature Floor Radiant Heating

采用计算流体力学方法,针对低温地板辐射采暖房间存在室内颗粒污染源时,对室内颗粒物随时间、空间变化的运动特性进行了数值模拟研究。研究结果表明,室内污染源(Z=1.5 m的发烟器平面)存在时,在t=60 s时,2.5μm的颗粒物已经扩散到整个房间内。小粒径(dp<5μm)的颗粒物受到浮升力的作用随气流的跟随性很强,而大粒径(dp>10μm)的颗粒物受重力作用大部分聚集在地面附近。

Using CFD method, the temperature field, particle concentration with time and space was simulated in a low temperature floor radiant heating room. The results show that 2.5 μm particles have diffused into the whole room at t=60 s when the indoor pollution source located at Z=1.5 m of the smoke plane. The particles with small particle size（dp〈5μm） is dominated by buoyancy force. The gravitational sedimentation is the primary reason for the particles with large particle size（dp〉10μm）.