qn/p(0800+6400)/3600×710) 2 0.86m/s 丌×012/4 qn2/_6400/(3600×710) =0.65m/s ×0.07 1-1面至4-4面间列机械能衡算方程: ④50xn&,D+6P2142+吃 d,2 50m 24 ④p:=7.0×10Pa 6×3mm l2:=40 φ76×3mm 设 W=279.1J/kg 备抑7m④p=0×10Pa 设 30n 备 40° Haight 5 l12=8m φ108×4m 飞收p3 =5.0104 Pa 3 p4 =7.0104 Pa 设 4 备 37m p1 =5.0104 Pa 设 一 1 1 30m 备 2 二 5m 40C =710kg/m3 l 12=8m 1084mm l 23=50m 763mm l 24=40m 763mm 1-1面至4-4面间列机械能衡算方程: ( ) ( ) m s d q u m 0.86 / 0.1 4 10800 6400 3600 710 4 2 2 1 2 1 2 = + = = ( ) m s d q u m 0.65 / 0.07 4 6400 3600 710 4 2 2 24 24 24 = = = 2 2 ' 2 2 4 2 4 2 4 2 1 2 1 2 4 1 2 4 1 1 u d u l d p l W gz p gz s + + = + + + Ws 279.1J / kg ' =