圆柱型迷宫式流道滴灌灌水器平面模型试验研究

在流道内的流体流动研究中引入PIV等先进的图像全场测速技术,关键是解决塑料灌水器模型本身的圆柱型以及不透明问题。以AutoCAD技术和读数显微镜相结合的方法测量灌水器迷宫式流道几何参数,探索性地借助不锈钢电火花线切割技术构建了圆柱型灌水器的平面模型,结果表明:平面模型与塑料原型的流态指数非常接近,利用电火花线切割技术可行;流量系数差异较大,应该选择粗糙度合适的平面模型上下表面材料;灌水器流道内部流动可以忽略材料极性引力的影响,流道深度对灌水器出流的影响主要是流量系数,而对于流态指数影响极小。

Plane Model of Labyrinth Path Drip Irrigation Column Emitter

The advanced whole-field velocity measurement,as particle image velocimetry(PIV),will be introduced to study the fluid mechanism in labyrinth path of drip irrigation emitters,and plastic emitter model is the key problem. The method of combining high-precision microscope and Auto-CAD technology was explored to measure the geometric parameters of the fluid paths,and the plane model was constructed via the technology of line incision with electric spark. The result indicated that the emitter exponents of plane model was very closed to prototype of emitters,and via the technology of line incision with electric spark was feasible. The polarity gravitations of materials could be ignored in research on the flow in labyrinth path. The emitter coefficients were different prodigiously, and the roughness level of the materials in the top and below surfaces must be chosen suitably. The effects of depth of flow path on the flux rate of emitter became true via emitter coefficients, and nothing on the emitter exponents.