微灌毛管水力计算曲线图及其应用(均匀管坡)——微灌水力设计计算方法探讨之四

Diagram of Hydraulic Calculation in Micro—Irrigation Lateral and Its Application (Uniformity gradient of pipe)

毛管水力设计,需要计算最小压力孔号,判断最大压力孔位置以及毛管最大压力偏差和极限长度,虽然已提出解析公式,但有相当大的工作量。为了减轻技术人员的设计计算工作量,特将(塑料管)最小压力孔号、压力不小于末孔的最小孔号、毛管最大水头偏差、毛管极限孔数等计算并绘成曲线图,供设计者查用。

Hydraulic design of micro—irrigation lateral requires the calculation of the minimum pressure hole to decide the place of the maximum pressure hole, maximum deviation in micro-irrigation laterals and limit length. There is a large amount of work load in designing and calculation though an analytic formulation has been proposed. In order to reduce the workload of technicians, and raise their working efficiency, this paper calculates the place of the minimum pressure hole, of which the pressure should be no less than minimum pressure of the hole at the end, maximum deviation in micro-irrigation laterals and limit length are all drawn up into a diagram, it is convenient for designers.