中文摘要：

根据成都市夏季室外颗粒物浓度的实测结果，利用数值流体力学方法对混合通风空调房间的粒子进行了模拟，分析了室内粒子的空间演化及其与室外粒子的浓度关系。结果表明，室内粒子浓度对室外粒子浓度具有直接的依赖性，其中进风携带的小粒子浓度在室内下降较为明显。因此，在研究室内空气品质的同时，应考虑室外背景粒子浓度变化的影响。

英文摘要：

Based on the time series of outdoor particle concentrations of Chengdu City in summer, the spatial variation of particle size distributions in a mixing ventilation room is simulated by using a Computational Fluid Dynamic （CFD） code and the relationship between indoor and outdoor particle concentration is estimated. The results show that the variation of indoor particle concentration is directly influenced by outdoor particle concentration, and fine particle concentration entering into the room with supply air decreased obviously indoor. Thus, the effect of outdoor particle concentration should be considered for indoor air quality controlling.