Based on the data provided by 466 surface automatic weather stations over Guangdong province,Guangzhou conventional weather station,and PM10 daily average concentration data frong four cities of Pearl River Delta,the surface flow fields during the typical serious haze process and cleaning process had been analyzed by using EOF(empirical orthogonal function).

This paper describes the velocity profile, turbulence intensity and Reynolds stress in the boundary layer and near wake of an airfoil measured in the low turbulence wind tunnel of NPU using a DISA hot wire anemometer.

As particle movement depends to a great extent on airflow motion in pipeline, in order to supply foundation and basis for the research of particulate deposition regularity, the study of structural characteristics and influence factors of pipeline flow field especially near-wall flow field is quite necessary.