不同通风方式下室内甲醛净化效果的数值模拟

Numerical simulation of indoor formaldehyde purification under different ventilation modes

为了获得合理的室内甲醛排除方法,利用Flent 14.5软件,模拟密闭、自然通风、机械通风三种工况下室内甲醛浓度场和速度场分布。结果表明,同一种工况下的速度场和浓度场均有较好的耦合性;自然通风和机械进风均会在窗的两侧靠墙角区域产生明显的涡流现象,而机械排风则没有明显涡流现象。使用机械通风时,在通风量有限的情况下,机械排风要优于机械进风;在通风量足够大时,二者均可,机械排风需着重注意污染源附近净化,机械进风需注意涡流区域净化。该研究为室内甲醛治理提供了有益的参考。

This paper is focused on the efforts to obtain reasonable indoor formaldehyde removal methods by simulating the concentration and velocity field distribution of indoor formaldehyde under three conditions of airtight,natural ventilation and mechanical ventilation using Flent 14. 5 software. The result shows that there is a better coupling both in the velocity field and concentration field under the same working condition; natural ventilation or forced air intake produces an obvious vortex near the two sides of the window,but this is not the case with the forced exhaust; the use of mechanical ventilation gives forced ventilation an advantage over forced air supply,as in the case of limited ventilation; the sufficient ventilation volume ensures the adequate performance of both,with an emphasis on the purification near pollution sources in the case of the forced exhaust and more attentions on vortex in the case of the forced air intake. The study may provide a useful reference for indoor formaldehyde treatment.