For incompressible fluid 0 df dc f' C C (2). Energy Equation(能量方程) 0 0 0 8gdh+ dc2+g.dit Ws =-dh 2 c2=2(h1-h2) c2=V2(hn-h2)+c2For incompressible fluid , (2). Energy Equation (能量方程) = 0 v dv c dc f df = − f c f , c q dh dc g dz +ws = + +  2 2 1 0 0 0 dh dc = − 2 2 2( ) 1 2 2 1 2 c2 − c = h − h 2 2 1 2 1 c = 2(h − h ) + c