基于射流脉冲三通的滴灌带试验研究

An Experimental Study of the Jet Pulse Tee Based on Drip Irrigation Pipes

基于射流脉冲原理，设计并加工了一种结构简单的射流脉冲三通，能够利用射流反馈振荡技术在滴灌带内形成脉冲水流，有益于提高滴灌系统的灌水均匀度，降低流量偏差率。在分析射流脉冲三通工作原理的基础上，通过水力性能试验，分析射流脉冲三通进口压力与振幅及出口流量的关系，研究滴灌带对射流脉冲三通振荡水流的响应特性，并对滴灌带脉冲频率、振幅与灌水均匀度及流量偏差率进行了试验研究，与相同条件下的普通三通作了试验对比。结果表明，射流脉冲三通2个出口能够产生强烈的振荡水流，并可在滴灌带内形成具有一定脉冲频率与振幅的脉冲水流，在20-80 kPa工作压力下，与普通三通相比，灌水均匀度提高0．75％-1．99％，流量偏差率降低3．73％-10．76％。

Based on the principle of the pulse jet ,a simple structure of the jet pulse tee is designed and fabricated .Technology is used to form a feedback oscillation pulse jet of water in drip irrigation pipe ,which is conducive to improving the irrigation uniformity of drip irrigation systems ,reducing the flow deviation rate .By analyzing the working principle of the jet pulse tee and the hydraulic per‐formance tests ,research is done on the relationship between the inlet pressure and amplitude and outlet discharge ,and research is al‐so done on the characteristics of drip irrigation pipe response to the oscillatory flow from jet pulse tee .In addition ,the pulse frequen‐cy of the drip irrigation pipe ,amplitude and irrigation uniformity and flow deviation rate are probed into .Ordinary tee pipe are com‐pared under the same experimental conditions .The results show that the ,jet pulse tee can generate a strong oscillatory flow having a certain frequency and amplitude in the drip irrigation pipe .In 20-80 kPa working pressure ,compared with ordinary tee ,irrigation uniformity increases by 0 .75% -1 .99% ,f low deviation rate decrease by 3 .73% -10 .76% .