摘要
利用计算流体动力学(CFD)技术对设计的一种新型微压滴灌带的水力特性进行了数值模拟,得到了灌水器内部的压力和流速分布,预测了压力流量关系。研究结果表明:该滴灌带灌水器的流量系数为0.4858,说明流道内为全紊流状态,有利于灌水器的消能,并可提高其抗堵塞性;灌水器进口及出口的压力变化很小,流道内沿水流前进方向压力均匀下降,流道单元相同时,压力变化幅度相同;流道内的流速可分为流道齿尖附近的主流区及齿脚附近的旋流区二个区,每二个单元之间的速度分布基本一致。采用CFD技术进行微压滴灌带结构设计是一种新方法,可快速准确地获得灌水器的水力特性,为其结构设计提供理论指导,同时大大缩短了研制周期,降低开发成本。
The computational fluid dynamics （CFD） approach was used to simulate the hydraulic characteristics for the new style irrigation belt with labyrinth channel. The velocity and pressure distributions in emitter flow field were obtained. The relation between head and flow rate was predicted. The result indicate that the flux coefficient of the irrigation belt is 0. 4858 that means the flow in the channel is turbulence, and can improve the anti-clogging of the emitter. The pressures of inlet and outlet of the emitter changed very little. The pressure dropped uniformity along the channel. The flow field can depart to two sections that were main stream near tooth tine and swirl near corner. The flow fields were same between two cells. It is a new method that using CFD technology to design drip irrigation belt. It can supply the hydraulic characteristics of emitter quickly and theory instruct for emitter＇s structure design.
出处
《灌溉排水学报》
CSCD
北大核心
2009年第4期25-27,31,共4页
Journal of Irrigation and Drainage
基金
863计划重点项目(2006AA100208)
西北农林科技大学科研启动项目
陕西省自然科学基金项目(SJ08E225)
关键词
滴灌带
水力特性
计算流体动力学
drip irrigation belt
hydraulic characteristics
CFD
