果园风送式喷雾机气流速度场模拟及试验验证

为了研究果园风送式喷雾机气流速度场速度分布特性及各因素的影响规律，揭示果园风送式喷雾机的工作机理，基于CFD模拟建立了Hardi LB-255型果园风送式喷雾机气流场速度分布模型。设计试验验证了模拟结果，并模拟获得了其气流速度场的分布特性。研究表明，进口气流速度变化对喷雾机气流速度场分布特性无显著影响；与风扇中心距离不同的截面上气流速度分布的规律有差异；而喷头体对气流速度场分布特性有显著影响，能使气流速度分布产生波动。模拟和试验结果的对比表明，不同条件下，所建模型能较准确模拟喷雾机气流速度场的分布。

CFD simulation and experimental verification of air-velocity distribution of air-assisted orchard sprayer

In order to investigate the characteristics of air-velocity distribution in the air-velocity field of air-assisted sprayer and effect pattern of various factors, so as to discover its working principle, a simulating model of air-velocity distribution on Hardi LB-255 air-assisted sprayer was developed based on CFD technology. The relative errors of simulated results were confirmed through corresponding experiments on the same condition. Based on the model, the air-velocity distribution pattern and spray mechanism were also obtained. The simulated results show that inlet velocity has little effect on the distribution pattern, but the distance to sprayer center and nozzles has a great effect on it. The nozzles caused velocity fluctuation in simulating filed, but it is good at improving spray quality. Meanwhile, the simulated results were compared with the corresponding experimental data. The results of comparison show that the model can accurately predict air-velocity distribution pattern of LB-255 sprayer.