室内3种送风方式下人体气溶胶颗粒数值模拟

The Numerical Simulation of Human Aerosol Particles under Three Air Supply Methods in Room

目的探讨空调房间不同气流组织形式下,人体持续说话散发气溶胶颗粒污染物的运动分布规律,探求空调房间合理的气流组织形式.方法运用CFD—fluent6.2模拟软件对空调房间上送下回、顶送下回及下送顶回3种送风方式进行模拟研究.分析不同送风方式下人体散发气溶胶颗粒的质量浓度分布及传播距离,房间换气次数对气溶胶污染物的质量浓度影响.结果顶送下回送风方式5次/h换气时气溶胶颗粒运动距离为1.5 m,而10次/h换气时气溶胶颗粒运动距离为1.0 m.结论相同换气次数下,顶送下回送风方式室内空气质量较佳.随着换气次数的增加,室内同一位置污染质量浓度降低,颗粒物传播范围减小.对于顶送下回送风方式增大换气次数不能降低人体感染风险.

Explore different airflow organization form in air conditioning room, the human body speaking spray aerosol particles, the movement of aerosol particles contaminant distribution, search for reasonable air organization form. Using CFD-fluent 6. 2 simulation software to simulate air flow in a conditioning room under three ventilation methods：up supply and down return, top supply and down return and down supply and top return. Analysis of the concentration and distribution around human body aerosol particles under dif- ferent air supplied way, and the room air change rate according to aerosol pollutants concentration effects. When air chang rate is 5/h,the aerosol particles movement distance is 1.5 m;and air change rate 10/h,the aerosol particles movement distance 1.0m. At the same air chang rate, top supply and down return, the way of ventilation, gives indoor air quality better. Along with the increase of air change rate, the same position in- door air pollution concentration and the particle transmission range reduced. Increasing air change rate in the top supply and down return way can not reduce the human body infection risk.