在喷、滴灌设计中,常需计算多孔管的沿程水头损失,原始的计算方法,是将相邻孔口之间的管段作为一个计算段,逐段计算沿程损失,然后相加。四十年代克里斯琴森提出:以与多孔管长度、直径、进口流量、流态相同而只有末端出流的无旁孔管(称相关管)的沿程损失,乘以多孔系数的方法,简化了计算,为人们所乐用。 In the spray and drip irrigation design, it is often necessary to calculate the head loss along the length of a perforated pipe. The original calculation method is to calculate the pipe length between adjacent orifices as a calculation section, calculate the loss along the section and add them together. In the 1940s, Christianson proposed a method of multiplying the loss along the length of a perforated pipe, the diameter, the inlet flow, the flow path of a sideless pipe with the same outflow only (referred to as an associated pipe), multiplied by a porous coefficient, Simplify the calculation, for people to use.