煤烧圆家重点实验宝 b- half of jet width In beginning region, the velocity distribution in boundary layer is similar at different sections f(c=f (3-2) Where:Ayo=y-y 0.lv-0.9 National Lab, of Coal Combustion. HUST Wuhan 430074 P R CHINA E-mail:pcbnlcc@hust.edu.cnNL CC National Lab. of Coal Combustion, HUST Wuhan 430074, P. R. CHINA E-mail: pcbnlcc@hust.edu.cn ( ) ( ) b y f y y f v v m c x = = (3-1) b - half of jet width In beginning region, the velocity distribution in boundary layer is similar at different sections ( ) ( ) 0 b y f y y f v v b x c =   = Where: 0 9 0 0.1 0. 0 b v v c y y y y y  = −  = − (3-2)