In this paper,thetype of flow in perforated pipe was analysed,and the influence of which on calculating waterhead losses was simulated by computer programme.

• 大量计算表明，灌溉中使用的小流量多孔管的首端流态一般是紊流光滑区和紊流过渡区，而在末端或多或少出现一定长度的层流段。