条缝型空气幕对抽油烟机污染控制的辅助作用

Auxiliary effect of slot air curtain on pollution control performance of kitchen range hood

运用数值模拟和实验测试方法,研究了住宅厨房在油烟机和送风气幕作用下的气流流动、温度分布和污染物扩散机理,并通过CFD数值计算对比分析了射速在0~5m/s范围的空气幕对厨房污染物扩散的影响.结果表明,单独使用抽油烟机作为厨房排风系统无法有效地将烹饪产生的油烟快速排向室外.空气幕作为补风装置应用在厨房通风系统不仅可以降低厨房空气温度,提高人体热舒适,而且能合理组织气流流动,降低厨房污染物浓度.然而,当油烟机排风量一定时,空气幕射速并非与油烟机捕集效率成正比,而是存在着最佳设计风速,排风速率为5m/s的最佳空气幕射速为0.6m/s.当通过增加油烟机排风量来提高捕集效率时,应根据不同的排风量确认对应的空气幕射速.

By using numerical simulation and field test method, air movement, temperature distribution and pollutant dispersion were investigated, when air was supplied through slot air curtain into the residential kitchen. The influence of jet velocity from air curtain on pollutant dispersion inside the kitchen was analyzed, where the range of jet velocity was from 0to 5m/s. Results show that oil fume generated by cooking cannot be effectively exhausted out of the kitchen by using the range hood alone. With the application of air curtain, the air temperature can be reduced to improve human thermal comfort, and the pollutant concentration can be decreased with the improved air distribution. However, with the given exhaust air volume, there was an optimal designed air supply velocity for the air curtain, since the capture efficiency of the range hood was not proportional to the air supply velocity. The optimal air velocity of the air curtain was 0.6m/s when the exhaust rate was 5m/s. Air velocity from air curtain should be correspondingly adjusted with the exhaust air rate, so that the capture efficiency of the range hood can be improved accordingly.