§2-3液流的连续性方程 ( the continuity of equation of liquid 、液流的连续性微分方程 (differential equation of continuity of liquid 如+p(m+2+m)=0 Ox / 不可压缩液体的连续性微分方程( differential equation of continuity of incompressible fluid + O O
§2-3 液流的连续性方程 (the continuity of equation of liquid) 一、液流的连续性微分方程 (differential equation of continuity of liquid) 不可压缩液体的连续性微分方程(differential equation of continuity of incompressible fluid) + ( + + ) = 0 z u y u x u d t d x y z d dt = 0 + + = 0 z u y u x ux y z u x x u x x + ( ) x u x z y
二、元流和总流的连续性方程( continuity equation of filament and total fiow)(量守恒定律 law of energy conservation) P,u,dA=p2u2dA, P,u, 恒定总流连续性方程( continuity equation of steady total flow) 41=5=9苦
二、元流和总流的连续性方程(continuity equation of filament and total flow)(质量守恒定律law of energy conservation) 恒定总流连续性方程(continuity equation of steady total flow): A1 1 = A2 2 = Q 1 u1 dA1 = 2 u2 dA2 1u1 2u2
§2-4理想液体总流的能量方程 (energy equation of ideal liquid) 、理想液体的运动微分方程回 pardo 无法显 +要 (differential equation of motion for real liquid I op du ax dt at +.2+1,-+l +l-+1,-+l 1 十.=+.=+1 az di z
§2-4 理想液体总流的能量方程 (energy equation of ideal liquid) 一、理想液体的运动微分方程 (differential equation of motion for real liquid) − = = + + + − = = + + + − = = + + + z u y z u x y u t x u d t d u z p z z u y z u x y u t x u d t d u y p y z u y z u x y u t x u d t d u x p x z z z z z y y y y y x x x x x f u u u f u u u f u u u 1 1 1 ( p ) y z x x p 2 − f x y z x (p ) y z x x p 2 + x z y
二、理想液体的伯努里积分和伯努里方程 (Bernouli's integration and Bernouli's equation of real liquid A积分条件: 1恒定流 2液体为不可压缩均质液体 3质量力有势 4沿流线积分 B方程 U 常数 当质量力只有重力→z+2+2=常数
二、理想液体的伯努里积分和伯努里方程 (Bernouli’s integration and Bernouli’s equation of real liquid) A 积分条件: 1 恒定流 2 液体为不可压缩均质液体 3 质量力有势 4 沿流线积分 B 方程: 当质量力只有重力 常数 常数 + + = − − = g p u p U z U 2 2 2 2