This study aimed at enhancing the performance of an emitter by optimizing the flow channel and reducing the flow index, which improves the energy dissipation coefficient and anti‐clogging ability of a pit drip irrigation emitter (PDIE). Methodologies of a flow numerical simulation and a model experiment were used to evaluate the influence of four types of optimized structure schemes of PDIE. The results show that the low‐velocity vortex zone in the flow channel increased the energy dissipation coefficient, and decreased the flow index, in which anti‐clogging ability was decreasing. The optimal design schemes 3 and 4 had a good working performance by reducing the flow area at the upper and lower ends of the PDIE and adding the resistance of the torus edge; the former added two triangles and the latter an arc and a triangle. The flow index was between 0.482 and 0.486, and the energy dissipation coefficient was 843–912. The optimizations improved the anti‐clogging ability by increasing the flow resistance and reducing the low‐velocity vortex zone. The experimental error compared with the numerical simulation for the flow index and the energy dissipation coefficient was less than 3%. This indicated that the analytical method used in this study was reliable. © 2020 John Wiley & Sons, Ltd.

中文翻译：

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结构设计和优化对井喷灌溉喷头性能的影响和分析*

这项研究旨在通过优化流道并降低流量指数来提高发射器的性能，从而提高井喷灌溉发射器（PDIE）的能量耗散系数和抗堵塞能力。采用流动数值模拟和模型实验的方法来评估PDIE的四种优化结构方案的影响。结果表明，流道内低速涡流区增加了能量耗散系数，降低了流动指数，使防堵塞能力下降。最佳设计方案3和4通过减小PDIE上下两端的流通面积并增加圆环边缘的阻力而具有良好的工作性能。前者增加了两个三角形，后者增加了弧形和三角形。流动指数在0.482至0.486之间，能量耗散系数为843–912。这些优化通过增加流阻和减小低速涡流区来提高了防堵塞能力。与流动系数和能量耗散系数的数值模拟相比，实验误差小于3％。这表明本研究中使用的分析方法是可靠的。分级为4 +©2020 John Wiley＆Sons，Ltd. 这表明本研究中使用的分析方法是可靠的。分级为4 +©2020 John Wiley＆Sons，Ltd. 这表明本研究中使用的分析方法是可靠的。分级为4 +©2020 John Wiley＆Sons，Ltd.