管道输水灌溉系统运行状况数值模拟及应用

Numerical Simulation and Application of the Operating Conditions of the Irrigation Networks with Pipe Conveyance

为了模拟不同工况条件下管道输水灌溉系统的运行状况,根据恒定流质量守恒定律与能量守恒及转化定律,构建了管道输水灌溉系统的数值模拟模型。该模型对管道输水灌溉系统建立水力状态方程组,并以二分法进行求解,模拟结果包括各级管道主要节点的流量、工作压力,各放水口的流量以及水泵的流量、扬程、轴功率、效率等状态参数。案例分析表明,该模型用于模拟各轮灌组工作状态时,均可快速收敛,模拟结果为系统用水管理与工程设计方案的优化提供了重要依据,体现出较好的实际应用价值。

In order to simulate the operating status of the irrigation networks with pipe conveyance under different working conditions,this pa⁃per presents a numerical simulation model based on the mass conservation law and energy conservation law of constant flow.In this model,the equations of hydraulic state are established respectively to indicate the irrigation networks with pipe conveyance by using the bisection method to solve the equations respectively,the simulation results include the actual working points of the main nodes of the pipelines and the outlets,and the actual flow rate,head,power and efficiency of pumps.The case analysis shows that the model converges rapidly under the condition of each rotational irrigation schemes,the simulation results provide an important basis for water management of the system and the optimization of the engineering designs,which reflects a good practical application value.