基于CAD的滴灌系统水力自动计算模型

Hydraulic Analysis Model in a CAD System for the Design of Drip Irrigation

针对滴灌CAD系统中水力计算与管网布置的耦合问题,研究了管网图形识别及有效性判定,并基于AutoCAD二次开发思想,应用步进法水力学解析原理,建立了滴灌系统计算机辅助设计水力计算模型,有效地将管网图形与水力计算耦合,使水力计算结果及时反馈到管网图形中,为实际工程管网水力性能的优化提供了技术手段。通过算例对该模型进行了验证,结果表明,应用该模型计算出的流量和水头偏差率均在允许范围内,管网识别及水力计算过程可在10 min内完成。

Based on the extended application of AutoCAD software, a new computer model was developed for analyzing the pipe network hydraulic characteristics in drip irrigation system. Through analyzing the pipe network validity and hydraulics analytical theory of forward step method, the network graphics were effective coupled with the hydraulic calculation. Using this model, the hydraulic calculation results could feedback to the network graphics in real-time, and achieve a reasonable optimization design of pipe network. A typical application example of the model for drip irrigation was presented; the results showed that the calculated deviation of head and flow rate were reasonable; the identification of the pipe network validity and hydraulic calculation process could be completed within 10 min.