微灌灌水小区水力算法改进及算例分析

Analysis of Hydraulic Calculation Method and Calculating Cases for Microirrigation Plot

改进一种对由支、毛管均为顺逆坡铺设时所构成的灌水小区的水力计算详算法。该法将用于一条毛管水力计算的详算法扩至整个灌水小区,将一条毛管在支管上双向布置位置选择扩至小区内均为顺、逆坡布置的支管和所有毛管,通过计算机快速求出各管段、各孔口的压力、流量值。通过实例计算表明,灌水小区内灌水器流量的平均值等于灌水器设计流量,满足规范规定的设计要求。同时,该计算方法可为微灌灌水小区压力、流量的确定和设置压力(流量)控制(调节)设备提供理论设计参数依据。

This study was carried out to improve the stepwise calculation method of hydraulic calculation for designing micro-irrigation plot,whose branch pipes and laterals were laid under positive and reverse slope condition.Typical case showed that emitters＇ average flow of irrigation plot was equal to emitters＇ design flow,flow deviation rate was less than that of permission,the results satisfied the requirements of design regulation.At the same time,the stepwise calculation could provide the theoretical basis for controlling the pressure in microirrigation plot,determining the flow and design pressure.