不同污染源位置对颗粒物浓度影响的数值模拟  

Numerical Simulation of the Concentration Variation Under Different Pollutant Sources in a Displacement Ventilating Room

作　　者：许婕[1] 亢燕铭[1] 钟珂[1] 

机构地区：[1]东华大学环境科学与工程学院

出　　处：《洁净与空调技术》2008年第1期12-16,共5页Contamination Control & Air-Conditioning Technology

基　　金：国家自然科学基金(No.50578034);上海市"曙光"计划(No.03SG30)资助项目

摘　　要：采用计算流体力学方法,针对室内人员日常活动及办公行为两种不同情况下产生的颗粒物在置换通风室内的分布进行模拟研究。分析了5种典型粒径的颗粒物在这两种不同污染源释放位置下的浓度分布。结果表明,若污染源高度靠近地面,则产生的颗粒物在人员呼吸区浓度较低,而人员活动时在较高位置产生的颗粒物因受到热浮力的作用,在呼吸面上的浓度较高;热浮升力对小粒子(dp<5.0μm)的输运起支配作用,而大粒子将受重力作用而沉降至地面。因此,不同污染源位置产生的不同粒径颗粒物对室内空气品质影响不同。Particle concentration distributions generated by two different cases （human normal activities and human working activities） are simulated in a displacement ventilated room by using a computational fluid dynamics （CFD） program, respectively, and five typical sizes of particle are considered for both of the cases. The results show that the source located near the floor has little influence on the concentration levels in the breathing zone, while the particle generated by human working which mainly influenced by buoyancy can result in a high concentration on the breathing zone; Transport of fine particle （dp〈 5.0 μm） indoor is dominated by buoyancy force, and gravitational sedimentation is the primary reason for larger particle＇s settling. Thus, different heights of particle sources have different effect on indoor air quality controlling.

关 键 词：置换通风 颗粒物浓度 沉积 浮升力 热浮升气流 

分 类 号：X512[环境科学与工程—环境工程]