Authors

Abstract

In order to reduce the drift loss of small droplets sprayed at low altitudes and low volume, a two-channel two-phase electric centrifugal nozzle was designed. The three-dimensional full-size numerical simulation of the flow field in the nozzle was carried out using Fluent software, and the radial distribution characteristics and axial variation of the flow field were studied. The relationships between the motor voltage and the atomizing disc's speed, between the nozzle's inlet pressure and its flow rate were determined. The variations of the droplet size and the droplet spectrum width with the atomizing disc and flow rate were revealed. The results showed that the rotation speed and flow rate were the important factors affecting the droplet's middle diameter and spectrum width. When the rotation speed of atomizing disc was 4000 r/min, the droplet spectrum width exhibited the narrowest, and the middle diameter of the droplet volume was 231.9 μm. The droplet coverage density was higher, meeting the requirements of low-volume aviation spraying control. This study provides a theoretical basis for optimizing nozzle configuration and developing variable spray devices.

Abstract in Chinese

为了减少低空低量喷洒中小雾滴的飘移损失，本文设计了一种双流道两相电动离心喷嘴。通过 Fluent 软件对喷嘴内流场进行三维全尺寸数值模拟，研究了喷嘴稳定喷雾时内流场径向分布特性及轴向变化规律。通过试验明确了电机电压与雾化盘转速、喷嘴入水口压力与其流量间的关系，揭示了雾滴粒径和雾滴谱宽度随喷嘴流量、雾化盘转速的变化规律。结果表明，该电动离心喷嘴可有效改善雾化盘底部液膜分布及喷雾均匀性，提高药液雾化效果。转速和流量是影响雾滴体积中径和雾滴谱宽度的重要因素。当雾化盘转速为4000r/min时，雾滴谱宽度最窄，此时雾滴体积中径为231.9μm，雾滴覆盖密度较高，可满足航空低量喷洒的防治要求。该研究为优化喷嘴构型，研发变量喷雾装置提供了理论基础。