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对于地板送风系统,空气从架空地板下直接送入人员呼吸区,送风气流卷吸地板附近颗粒物对室内颗粒污染物浓度有重要影响。为了研究气流速度对颗粒浓度的影响特性,建立了模拟空气流动和颗粒运动轨迹的模型,并且在4种不同气流速度下在一间全尺寸小室内进行试验,测试了不同粒径颗粒浓度的衰减。试验结果表明,随送风气流速度增大,室内较大颗粒浓度衰减比较小颗粒更快;另一方面,计算结果也表明,气流速度对不同尺寸颗粒的分布影响不同,特别是大于3μm的颗粒随着气流速度增加,其悬浮寿命衰减比1 μm以下的颗粒显著得多。计算与试验结果的趋势非常一致。结果对室内颗粒污染物的治理研究有一定意义。
For the floor air supply system, the air directly from the overhead floor into the personal respiratory area, air entrainment entrainment particles near the floor of the indoor particle concentration of pollutants have a significant impact. In order to study the influence of airflow velocity on particle concentration, a model of air flow and particle trajectory was established and tested in a full-size chamber at four different airflow velocities. The attenuation of particle size at different particle sizes . The experimental results show that as the velocity of the air flow increases, the larger particles in the chamber attenuate faster than the smaller particles. On the other hand, the calculated results also show that the airflow velocity has different effects on the particle size distribution, especially the particles larger than 3μm As the air velocity increases, the suspension lifetime decreases significantly more than particles below 1 μm. The calculations are in good agreement with the trend of the test results. The results of indoor particle pollutants governance research has some significance.