煤烧圆家重点实验宝 Chapter 3 Jet Flow Theory 8 1 Theory of Isothermal Free Jet Free jet: Jet without the limitation of solid boundary 1. General Properties National Lab, of Coal Combustion. HUST Wuhan 430074 P R CHINA E-mail:pcbnlcc@hust.edu.cn
NL CC National Lab. of Coal Combustion, HUST Wuhan 430074, P. R. CHINA E-mail: pcbnlcc@hust.edu.cn Chapter 3 Jet Flow Theory §1 Theory of Isothermal Free Jet Free jet: Jet without the limitation of solid boundary 1. General Properties
煤量甏圆家重点实验宝 Ce 开始区域 转捩载面 基本区域一 气流核心 内边界 S S S 外边界 National Lab, of Coal Combustion. HUST Wuhan 430074 P R CHINA E-mail:pcbnlcc@hust.edu.cn
NL CC National Lab. of Coal Combustion, HUST Wuhan 430074, P. R. CHINA E-mail: pcbnlcc@hust.edu.cn
煤量甏圆家重点实验宝 1)turning section O 2)beginning region and basic region 3)core with velocity of beginning one 4)turbulent boundary layer-the part between inner boundary (v=vo) and outer boundary (v=0) 5)polar point: cross point of outer boundary surface 6) Similarity National Lab, of Coal Combustion. HUST Wuhan 430074 P R CHINA E-mail:pcbnlcc@hust.edu.cn
NL CC National Lab. of Coal Combustion, HUST Wuhan 430074, P. R. CHINA E-mail: pcbnlcc@hust.edu.cn 1) turning section SH dO 2 1 4 2) beginning region and basic region 3) core with velocity of beginning one 4) turbulent boundary layer - the part between inner boundary (v=vo ) and outer boundary (v=0) 5) polar point: cross point of outer boundary surface 6) Similarity
煤量甏圆家重点实验宝 In basic region, the distribution of non-dimensional velocity is complete similar 1. e at corresponding points y Where vm-velocity at x axis yc -distance of points with velocity(1/2)vm with x axis National Lab, of Coal Combustion. HUST Wuhan 430074 P R CHINA E-mail:pcbnlcc@hust.edu.cn
NL CC National Lab. of Coal Combustion, HUST Wuhan 430074, P. R. CHINA E-mail: pcbnlcc@hust.edu.cn In basic region, the distribution of non-dimensional velocity is complete similar i. e. at corresponding points 1 2 1 2 = = m x m x c c v v v v y y y y Where vm - velocity at x axis yc - distance of points with velocity (1/2)vm with x axis
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.cn
NL 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)