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利用激光粒度仪、法拉第筒和粒子图像测速系统(PIV)研究喷头喷嘴直径、喷雾压力、充电电压参数对于静电喷头雾滴粒径、荷质比、荷电雾滴雾化流场的影响。结果显示:喷嘴直径、喷雾压力和充电电压对喷头雾滴粒径大小均有影响,3个参数对雾滴粒径分布的影响程度排序为喷雾压力>喷嘴直径>充电电压;荷质比随电压的增加而增加,最大可达到2.09 m C/kg,并在电压为8 k V以后趋于饱和,荷质比随雾滴粒径的变大呈下降趋势,但是变化不快;由荷电雾滴的运动轨迹可知,喷嘴直径为0.9 mm的喷头在充电电压为8 k V时具有较好的荷电效果,与不带电情况下喷雾对比发现,荷电雾滴使喷雾扩散明显加大,且雾滴速度均匀。
The effects of nozzle diameter, spray pressure and charging voltage parameters on the droplet size, charge-mass ratio, and atomized droplet atomization flow field of an electrostatic nozzle were studied by laser particle sizer, Faraday cage and particle image velocimetry system (PIV). The results show that nozzle diameter, spray pressure and charging voltage have an impact on the particle size of spray head. The order of influence of the three parameters on spray particle size distribution is spray pressure> nozzle diameter> charging voltage. The maximum can reach 2.09 m C / kg and tends to be saturated after the voltage is 8 kV. The mass-to-charge ratio tends to decrease with the increase of droplet size, but the change is unpleasant. The results show that the spray nozzle with nozzle diameter of 0.9 mm has a good charge effect when the charging voltage is 8 kV. Compared with the spray without electricity, the spray droplets with the diameter of 0.9 mm have obvious charge diffusion and the fog Drop speed uniform.