静电雾化喷头喷针布局方式的分析与优化

静电雾化喷头中喷针排布方式的设计与优化对提高农药雾化效率有着至关重要的作用,以此为目标文中对特定参数的静电雾化喷头提出了3种喷针布局方式,建立多针喷嘴为平板电极电场求解模型,以Ansoft Maxwell电磁场分析软件为工具,获得了3种静电雾化喷头周围平面电场强度分布云图以及特殊路径电场的分布曲线,针对电场分布更优的排布方式进一步对喷针的排布密度进行了仿真,并对6种喷针布局的喷头进行了水溶性溶液的静电喷雾试验.结果表明:在其他条件不变的情况下,与正方形阵列、六边形阵列相比,选择圆周阵列且采用更小的分布半径能够产生更好的液滴粒径分布,考虑到实际应用,过于紧密的排布会产生的过小针距,这将容易使针尖周围的空气击穿从而影响雾化过程,故采用半径为6 mm的圆周阵列方式最为合适,该试验结果与模拟计算结果基本一致.

Analysis and optimization of needle layout for electrostatic atomizing nozzle

The design and optimization of spray needle arrangement in electrostatic atomization nozzle plays a very important role in improving the efficiency of pesticide atomization. To solve this problem, three kinds of spray needles layout methods are proposed for the electrostatic spray nozzle with specific parameters, and the electric field solution model of multi needle nozzle plate electrode is established. Using Ansoft Maxwell electromagnetic field analysis software as the tool, the plane electric field intensity distribution contour plot and the special path electric field distribution curve around the three kinds of electrostatic spray nozzle are obtained. The distribution density of the injection needle was further simulated for the better distribution of electric field, and the electrostatic spray experiment of the water soluble solution is carried out on six injector nozzles. The results show that: under the same conditions, compared with rectangular array and hexagon array, choosing circular array with smaller distribution radius can produce better droplet size distribution. Considering the practical application, too close distribution will result in too small needle spacing, which will easily cause the air breakdown around the needle tip and affect the atomization process. Therefore, the circular array with a radius of 6 mm is adopted, the circumferential array is the most suitable method, and the experimental results are basically consistent with the simulation results.