三角形灌水器形状参数对其水力性能的影响

The Effect of Drip Irrigation Emitter Channel Structural Parameters of the Triangular Type on Its Hydraulic Performances

摘要: 灌水器作为滴灌系统的核心部件，流道结构设计对其水力性能和抗堵性能具有较大影响。本文基于流体动力学(CFD)，采用ANSYS Fluent软件对三角形内镶式灌水器内部流场进行了模拟分析，并提取了其流道形状的几何参数，针对每个参数对灌水器水力性能的影响进行了分析。结果表明：灌水器的出口流量随着流道高度增加、齿尖圆角增大、齿尖角度减小和齿尖距离减小而增大，灌水器成型加工产生的脱模斜度对出口流量的影响较小。灌水器的流态指数随着齿尖圆角减小、脱模角度增大、齿尖角度增大和齿尖距离增大而减小，流态指数对流道高度的变化并不敏感。

Abstract: As the key part of the drip irrigation system, drip irrigation emitter channel structure is important to its hydraulic performances and anti-clogging performance. Computational fluid dynamics (CFD) was used to simulate the flow field distribution of the in-line drip irrigation emitter channel of the triangular type. The shape parameters of the channel were defined, and the influence of each parameter change on hydraulic performance of the drip irrigation emitter was analyzed. The study indicates that the flow rate increases with the increase of the channel height and the fillet radius of the tooth tip, also increasing with the decrease of the angle of the tooth tip and the distance of the opposite tooth tips, and the flow rate changes with the emitter draft angle are not obvious. The result shows that the flow index of the drip irrigation emitter decreases with the increase of the emitter draft angle, the angle of the tooth tip and the distance of the opposite tooth tips, also decreasing with the decrease of the fillet radius of the tooth tip, and the flow index is unrelated to the changes of the height of the channel.