一种变曲率式流道灌水器的数值模拟分析

Numerical Simulation of a Variable-Curvature Labyrinth Channel Emitter

针对一般灌水器流量对压力变化的敏感程度偏大,灌水器易堵塞的问题,提出了一种变曲率式流道灌水器。结合绕流原理和环流原理,参考主航道设计思想,采用曲面壁面设计。应用CFD软件对灌水器内部流动状态进行数值分析,得到灌水器的压力～流量曲线以及在一定压力下的水流迹线图和粒子轨迹图,并通过水力性能试验和短周期抗堵性能试验对其进行验证。揭示了灌水器内部流动特性及消能机理,为新型灌水器的设计与开发提供一定的理论基础。

In order to solve the problem of the high sensitivity of the flux to the pressure change and the unsatisfactory working performance under the low pressure condition,the paper presents a kind of variable curvature flow channel emitter. The emitter is combined with the principle of circumferential flow and circulation,with reference to the main channel design concept,the design of the curved wall is adopted.CFD software is applied to carry out the simulation about the internal flow state of the emitter,the pressure-flow curve,the water flow chart and the particle trajectory chart under certain inlet pressure are obtained,and designs the hydraulic performance test and anti-blocking performance test to verify it. The internal flow characteristics and dissipation mechanism of the emitter are revealed,which provides a theoretical basis for the development of new emitter.