摘要： 借助 CFD 软件对车间内纳米颗粒物的扩散问题进行了数值研 究，采用 RNG κ-ε 两方程模型计算车间内湍流，计算得到不同风速风 向条件下人体呼吸高度上风场和颗粒物的浓度分布。结果表明，在不采 取通风措施的条件下， 车间内纳米颗粒物容易堆积，30 min 内最大浓 度可达 1430.71 μg/m3，通风使车间内空气条件得到明显改善，在排放 源的下风向仍有纳米颗粒物堆积的现象，随着风速的加大，纳米颗粒物 堆积的范围和浓度都明显减少。
关键词：纳米粉尘；风速；数值模拟；浓度
Abstract：The nanometer particles’ diffusion question was investigated by using the computational fluid dynamics（CFD） software and the RNG κ-ε two equation turbulence models，and the wind field and the distribution of particulate concentration at the human respiratory height under different ventilation conditions were studied. The results indicated that the nanome ter particles would pile up easily without any ventilation measures，which maximum concentration could reach 1 430.71 μg/m3 in 30 min in the work shop. The ambient air in the workshop were markedly improved under the conditions of ventilation，but there was still large area of high concentration zones at the downstream wind direction of the leaking point when the wind speed was small. As the wind speed increased，the accumulation scope and concentration of the nano-particles decreased significantly.
Keywords：nano-sized particle；numerical simulation；concentration
