送风量影响外源颗粒物室内扩散试验研究

摘要

为了研究送风量对外源颗粒物室内扩散的影响规律，在7.6 m×5.6 m×4.6 m（长×宽×高)的试验空间内，使用旋流施放装置向送风管道内施放示踪剂、控制送风量和采用立体多时段采样化学分析法，对不同送风条件下外源颗粒物室内扩散进行了试验研究。结果表明，外源有害颗粒物通过通风管路进入室内，送风量对外源颗粒物室内扩散有明显的影响，随送风量增大，室内悬浮颗粒物浓度相对均方差减小，平均浓度、危害面积以及危害体积呈现先增大后趋于稳定的趋势；颗粒物污染事故发生后，为减轻受影响建筑室内的危害程度，及时关闭送风是有效处置措施之一。%In order to study the influence of air supply volume on the indoor diffusion of particles of outdoor ori-gin , the experimental study on the indoor diffusion of particles of outdoor origin with different air supply was carried out in one larger test room of 7. 6 m × 5. 6 m × 4. 6 m ( length, width and height) by using the cyclone dispensing device to send tracer in the duct, controlling the air flow rate, using three-dimensional and multi-period sampling method and chemical analysis method. Experimental results show that in the case of particles entering the room through the air supply pipe, air supply volume has great influence on the indoor diffusion of particles of outdoor ori-gin, with the increase of air supply volume, concentration relative mean square deviation of indoor suspended parti-cles decreases, average concentration, toxic area and volume increases first and then inclines to stable value. In or-der to reduce the harm degree of indoor in the accident after the particles pollution accident, timely closure of the air supply is one of the effective disposal measures.