摘要
在加压灌溉系统中,压力和流量变化常常引发系统的低效,对农业喷洒和微灌系统产生负面影响。为了对这种非稳定流系统进行性能分析,开发了PNCS模型。它利用特性方程的简化解模拟管网中的流动,并在每个配水点基于一组给出数量序列启动的配水点对其相对压力损失的计算来进行管网的性能分析。也可以识别不满足额定压力和流量条件的配水点以及由于管径过小而导致压力损失偏大的区域。将此模型应用于加拿大多伦多地区的一处灌溉系统并进行测试,显示了良好的效果。
In pressurized irrigation systems,pressure and discharge variations cause low service performances and negative impact on farm sprinklers or micro-irrigation systems.To make a performance analysis of these systems,the PNCS model has been developed and applied.Using a simplified solution of the characteristic equations of flow,it simulates flow in the irrigation systems.The performance analysis conducted is based upon the computation of the relative pressure deficits at every hydrant within a given number of configurations of hydrants operating simultaneously.This approach allows identifying both the hydrants which do not satisfy the preset pressure and discharge conditions and the areas where pipe sizes may be undersized.The model is tested with data collected in an irrigation system in Toronto.Results demonstrate the ability of the model to make the conditions observed at selected hydrants reappear.
出处
《中国农村水利水电》
北大核心
2010年第9期105-107,110,共4页
China Rural Water and Hydropower
关键词
加压灌溉管网
水力模拟
非稳定流
性能分析
pressurized irrigation networks
fluid-flow simulation
unsteady flow
performance analysis
