反吹式吸嘴流场数值分析及吸尘效率研究

为提高扫路车的吸尘效率,采用计算流体动力学(computational fluid dynamics,CFD)技术对反吹式吸嘴流场进行计算,分析结构参数对吸尘效果的影响规律,并结合气固两相流动模型对优化后模型的吸尘效率进行计算.研究表明:吸尘口的直径不大于反吹式吸嘴宽度的 0.47 倍、倾角不大于105时,分别增大吸尘口直径和倾斜角度,均可提高吸尘效率;反吹式吸嘴近地面气流速度大且方向紧贴地面,不存在气流外泄造成的二次污染;车速由 5 km/h 提高到15 km/h 时,总除尘效率下降了27%,其中 45 m 粒径颗粒的分级除尘效率下降了 9%,152 m 粒径颗粒的分级除尘效率下降了 33%. 

Research on Numerical Analysis and Dust Collection Efficiency of Reverse Blowing Pickup Mouth

In order to improve dust collection efficiency, the computational fluid dynamics (CFD) technology was used to calculate the flow field of reverse blowing pickup mouth, analyze the structural parameters influence on the dust collection efficiency, and calculate the dust collection efficiency combined with the gas-solid flow model. The results show that when the ratio between outlet diameter and width is less than 0.47 and the dip angle is less than 105,the dust collection efficiency can improved by increasing the outlet diameter and dip angle.Airflow velocity is high and the direction is close to the ground when reverse blowing pickup mouth is near the ground. There is no leakage to bring about secondary pollution. The overall removal efficiency declines by 27%when traveling speed increases from 5 km/h to 15 km/h, in which the grade efficiency of 45 and 152 m particle diameter respectively decrease by 9%and 33%.