摘要
数值模拟是研究汽车扬尘时空分布的重要方法,地面扬尘浓度条件则是数值模拟求解的关键。不同于已有的整体均匀入射或局部单一强度入射条件,由风沙理论推导了更合理的一般浓度边界条件,在此基础上研究了颗粒重力及车轮旋转对扬尘的影响,并得出车速与扬尘量之间近似为指数的关系。这一方法对进一步研究汽车造成的污染问题具有积极的作用。
Numerical simulation is an important method to study the spatial and temporal distribution of automotive dusting.The inflow concentration of dusting from the ground is one of the key boundary conditions for numerical solving. Unlike those existing concentration conditions with the overall uniform inflow intensity or the predefined local inflow intensity, the concentration expression of bed load according to the local flow field conditions was deduced. Based on this method,the effects of gravity and wheel rotation on dusting were investigated. The approximate exponential relationship between the automotive speed and the dusting amount was noticed. The present method will provide the positive effect for the further study of pollution caused by vehicles.
出处
《环境工程》
CAS
CSCD
北大核心
2015年第1期85-89,共5页
Environmental Engineering
基金
陕西省教育厅自然科学科研专项(2010JK658
11JK0530)
关键词
汽车扬尘PM10
数值模拟
浓度边界条件
automotive dusting PM10
numerical simulation
concentration boundary condition
