Abstract: Aiming at the solar greenhouse of southnorth ridge planting mode, without interrow roads or suspended guideway, rowside spraying operations with centrifugal atomizing and airassisted technologies can be useful. In the paper, the volume median diameter and relative span as the indicators, the spray distance, the speed of the centrifugal nozzle, and the rate of flow as the factors, droplet diameters factor test and droplet diameter model calibration test conducted for the carttype electric centrifugal atomizing sprayer equipped with the intermittent spraying control system with rowside spraying operations. The results showed that: The rate of flow could be linearly fitted by its motor duty, and so could the speed of the centrifugal nozzle; For the median diameter of the volume, the spray distance negatively correlated to it as the duty cycle of the centrifugal nozzles motor is 15%, the speed of the centrifugal nozzle negatively correlated to it for any spray distance or rate of flow, the rate of flow positively correlated to it for any the speed of the centrifugal nozzle; The relative span was positively correlated with the speed of the centrifugal nozzle or the rate of flow.  With the nonlinear regression fitting method, the initial droplet diameter model related to the speed of the centrifugal nozzle and the rate of flow was established under the spray distance of 0.50-1.00 m by the nonlinear regression fitting method. Within the ratio range pulse width, the volume median diameter could be adjusted from 46.9 to 100.3 μm, which met the diameter requirements of droplets in different situations.

Key words: spraying, PWM, diameter of droplets, centrifugal atomizing, spray system

摘要： 针对无行间硬化路与悬挂导轨的南北垄种植的日光温室，可采用离心雾化与气流辅助技术进行行侧施药作业。针对搭载对行间歇施药控制系统的推车式电动离心雾化喷雾机，以体积中值直径、相对跨度为指标，喷雾距离、雾化器转速、泵流量为试验因素，进行雾滴粒径影响因素试验和雾滴粒径模型标定试验。试验结果表明：流量、雾化器转速与其控制电机占空比均可进行线性拟合；针对体积中值直径，仅在雾化器电机占空比为15%时，喷雾距离呈负相关的显著性影响；任一喷雾距离或流量，雾化器转速对其呈负相关的显著性影响；任一雾化器转速，泵流量呈正相关的显著性影响；雾化器转速、泵流量均对相对跨度呈正相关的显著性影响；采用非线性回归法，建立喷雾距离在0.50~1.00 m下雾化器转速和泵流量相关的初始雾滴粒径模型，在有效占空比范围内，雾滴粒径在469~1003 μm范围可调，满足不同情况下的雾滴粒径需求。

关键词: 喷雾, 脉宽调制, 雾滴直径, 离心雾化, 喷雾系统