基于CFD离散型静电喷药沉积特性数值仿真研究  

Numerical simulation research on electrostatic spray deposition characteristics based on discrete phase of CFD

作　　者：伍志军 廖红 邓家波 莫愁 吕小荣 陈霖 WU Zhijun;LIAO Hong;DENG Jiabo;MO Chou;LÜ Xiaorong;CHEN Lin(College of Mechanical and Electrical Engineering,Sichuan Agricultural University,Ya’an 625014,China)

机构地区：[1]四川农业大学机电学院,四川雅安625014

出　　处：《河南农业大学学报》2022年第5期849-857,共9页Journal of Henan Agricultural University

基　　金：国家现代农业产业技术体系四川创新团队建设专项资金(sccxtd-2021-20)。

摘　　要：【目的】研究静电喷药和常规喷药在植保作业时的药液沉积特性,解决植保作业中雾滴数据难采集和环境参数不可控等问题,提高植保作业质量。【方法】基于计算流体动力学(computational fluid dynamics,CFD)离散相模型的粒子追踪技术和电磁流体力学(magnetohydrodynamics,MHD)对静电喷药和常规喷药分别在环境风速范围为0~3 m·s^(-1)、喷药高度为30~200 cm范围内的药液沉积特性进行对比模拟分析。【结果】常规喷药的药液粒径均大于静电喷药。喷药高度和环境风速对药液颗粒沉积影响较大,静电喷药在环境风速1 m·s^(-1)时静电感应较强,在喷药高度30~100 cm范围内沉积效果明显,此时药液最大沉积率高于常规喷药48%;随着环境风速和喷药高度的进一步增加,静电感应逐渐减弱,药液沉积率与常规喷药相比无明显变化。当环境风速为1 m·s^(-1)和喷药高度为150 cm时,静电喷药和常规喷药沉积率相差达到峰值。【结论】静电喷药的药液沉积效果普遍优于常规喷药,且通过沉积模型可预测静电喷药在自然风场下的雾滴沉积效果,为田间高质量植保作业提供理论依据。【Objective】To compare the droplet deposition characteristics between electrostatic spray and conventional spray during operations for plant protection,solve the problems of difficult collection of fog drop data and uncontrollable environmental parameters in plant protection operation and improve plant protection efficiency.【Method】Based on computational fluid dynamics(CFD)discrete phase model particle tracking technology and magnetohydrodynamics(MHD),the droplet deposition characteristics were contrasted,simulated and analyzed when the range of ambient wind speed and spray height were 0 to 3 m·s^(-1) and 30 to 200 cm respectively.【Result】The particle size of conventional spray was larger than that of electrostatic spray and the results show that ambient wind speed and spray height had great influence on spray droplet deposition.When the ambient wind speed was within 1 m·s^(-1),the effect of electrostatic induction was stronger,and the effect of electrostatic spray deposition was more obvious with higher deposition amount compared with the conventional spray within the spray height of 100 cm,at this time the maximum deposition rate was higher than that of the conventional spray by 48%.With the further increase of ambient wind speed and spray height,the effect of electrostatic induction gradually weakened,and its deposition rate amount was not obvious compared with that of the conventional spray.When the ambient wind speed was 1 m·s^(-1),the spray height was 150 cm,and the deposition rate difference between electrostatic spraying and conventional spraying reached the peak.【Conclusion】By establishing the deposition model of two spraying methods,it is found that the deposition effect of electrostatic spraying is better than that of the conventional spraying.The deposition model can help to predict the droplet deposition effect of electrostatic spraying in natural wind field,so as to provide a choice for high-quality plant protection operation in the field.

关 键 词：计算流体动力学 离散相模型 电磁流体力学 静电喷药 常规喷药 沉积率 仿真研究 

分 类 号：S491[农业科学—植物保护]