摘要
目的研究上吸罩物理参数(罩子高度、挡板宽度、排风量)与捕集效率之间的关系。方法采用计算流体力学软件 FLUENT 建立模型,获得罩子内部气流流场速度矢量图;采用气流数值模拟和物理模型复测相结合的方法,以最大限度符合生产实际的操作条件,研究上吸罩高度、挡板宽度、排风量与捕集效率之间的关系。结果在上吸罩无挡板条件下,系统风量应选择1 320m^3/h;在上吸罩有挡板条件下,系统风量应选择1 078m^3/h,可实现有害气体的快速有效排除。系统在一定风量下,降低罩子安装高度可提高呼吸带平均风速;罩子安装高度和系统风量一定时。加挡板可以提高捕集效率;系统风量一定,无挡板时,捕集效率与控制距离(无因次)呈三次多项式显示的数量关系。结论上吸罩物理参数的改变对选定的呼吸带测点捕集效率产生影响。
Objective To study the relationship of the collection efficiency and physical parameters, such as the height of exhaust hood, baffle, ventilation conditions of these parameters on the effect of control. Methods The computational fluid dynamics software FLUENT was used to form the model, and to maximize production in line with the actual operating conditions for physics experiments, to take air numerical simulation and physical model of re-testing the method of combining. Results Without the lagging conditions, the air flow system should be chosen 1 320 m^3/h, with the lagging conditions, the air flow system should be chosen 1 078 m^3/h. The system in a certain air volume, lower installation height could increase the average wind speed of breathing zone. At a certain suction cover installation height and air flow, the baffle could improve the collection efficiency. Without the baffle, the collection efficiency and control distance （dimensionless） showed a relation of cubic polynomial. Conclusion The physical parameters of suction on the hood may impact the collection efficiency at breathing zone measuring point.
出处
《环境与健康杂志》
CAS
CSCD
北大核心
2008年第9期786-788,F0003,共4页
Journal of Environment and Health
基金
国家科技支撑计划项目(2006BAK05801-04-01)
关键词
上吸罩
数值模拟
捕集效率
Up-suction hood
Numerical simulation
Collection efficiency
