温室轨道式弥雾机气流速度场三维模拟与试验

3-D Numerical Simulation and Experiment of Air-velocity Distribution of Greenhouse Air-assisted Sprayer

摘要:

基于CFD模拟技术建立了温室轨道式弥雾机的气流速度场分布模型，并对模拟结果进行了验证。研究表明，在所设计的模拟区域内，气流速度在垂直和水平两个方向呈梯度减小趋势；改变喷孔气流速度对气流速度场空间分布状态不会产生显著影响，但对雾滴的分布范围有明显拓展作用；把喷孔气流速度由25 m/s提高到50 m/s，可将吹送距离由2.4 m增大到3.6 m，气流速度场范围半径由0.20 m扩大到0.25 m。试验和模拟结果对比表明，所建模拟模型能够较准确地模拟温室轨道式弥雾机气流速度场的速度分布特性。

关键词:弥雾机;温室;喷雾;计算流体动力学;三维模拟;气流速度场

Abstract:

An air-velocity distribution model of greenhouse air-assisted sprayer was built by means of CFD simulation technique. Experiments were designed for the evaluation of the simulation results. The research showed that the air velocity decreased as the distance increasing from spray nozzle in vertical and horizontal directions. The change of air flow rate at nozzle had no remarkable influence on the characteristic of air-velocity distribution, but enlarged the droplet distribution area significantly. By increasing the nozzle flow rate from 25 m/s to 50 m/s, the blowing distance could be increased from 2.4 m to 3.6 m, the range of air-velocity distribution expanded from 0.20 m to 0.25 m. The contrast of experiment results and simulation results showed that the simulation model built can be an accurate simulation of the air-velocity distribution of a greenhouse air-assisted sprayer.

Key words:Air-assisted sprayer;Greenhouse;Spray;CFD;3-D simulation;Air-velocity distribution