基于CFD模拟的街区布鲁氏菌泄漏扩散特性研究
Study on leakage and diffusion characteristics of Brucella in block based on CFD simulation
摘要：
在建立兰州生物药厂附近街区建筑群模型的基础上，利用离散相模型对布鲁氏菌颗粒物的扩散情况进行了模拟，分析了不同风向下短时间的扩散特征，确定了短时间内的扩散距离及最大影响高度。研究发现：布鲁氏菌颗粒物扩散速度较快，风速3.3 m/s情况下，300 s时颗粒物已扩散到距散发源500 m处，1 h时颗粒物已扩散到距散发源2 000 m处；布鲁氏菌颗粒物扩散高度随扩散距离的增大而增大。建议在排气口、邻近小区50 m高度处、散发源建筑与西北侧建筑的街谷1.5 m高度处设置实时微生物监控装置。
Abstract：
On the basis of establishing the building group model in the block near Lanzhou Biopharmaceutical Factory, the diffusion of Brucella particles is simulated by using the discrete phase model, and the short-term diffusion characteristics in different wind directions are analysed. The diffusion distance and the maximum height of influence in a short time are determined. It is found that the diffusion rate of Brucella particles is relatively fast, and when the wind speed is 3.3 m/s, the Brucella particles can diffuse to 500 m from the emission source at 300 s and 2 000 m at 1 h. The diffusion height increases with the increase of diffusion distance. It is suggested that the real-time microbial monitoring devices should be installed at the exhaust outlet, at the 50 m height of adjacent community, and at the 1.5 m height of the street valley between the emission source building and the northwest building.
Keywords:Brucella;bioaerosol;leakage;diffusioncharacteristic;winddirection;numericalsimulation;blockscale;environmentalmonitoringpoint