新型低风速排风柜动态控污响应分析
Response analysis on dynamic pollution control with a new type of low-speed fume hood
摘要：
为全面掌握新型低风速排风柜的动态控污性能,提出了基于CFD仿真的动、静相结合的模拟方法。研究了静态恒定低风速的流场分布及在不同柜门移动速度和不同风阀响应时间下排风柜的动态控污性能,通过面风速均匀性和排风口静压差2个指标来评估排风柜的静态、动态控污性能,并确认其工作状态是否正常、安全。结果表明:柜门移动速度或风阀响应时间对面风速影响较大,而对静压差影响较小,且柜门关闭后最终静压差逐渐趋于0.1 Pa;从气体流动角度看,整个动态过程虽然导致排风柜内涡流产生并消失的剧烈变化,但无直接泄漏现象发生。
Abstract：
In order to comprehensively grasp the dynamic pollution control performance of the new type of low-speed fume hood, a simulation method combining static and dynamic based on CFD simulation is proposed. By studying the flow field distribution of static constant low speed and the dynamic pollution control performance of the fume hood under different door moving speeds and valve response time, the static and dynamic pollution control performance of the fume hood are evaluated and whether its working status is normal and safe is confirmed by two indicators: inlet wind speed uniformity and static pressure difference at the outlet. The results show that different door moving speed or different valve response time has a higher impact on the inlet wind speed, but a less impact on the static pressure difference. The final static pressure difference gradually tends to 0.1 Pa after the door is closed. From the perspective of air flow, although the entire dynamic process leads to drastic changes in the fume hood, with the generation and disappearance of vortice, there is no direct pollution leakage.
Keywords:low-speed fume hood; CFD simulation; door moving speed; valve response; dynamic pollution control; bioaerosols