中文摘要：

为方便测量不同喷雾条件下雾滴粒径大小,该文设计了喷头位置、喷雾角度、喷雾压力和风速大小等试验条件可精确调节的风送喷雾雾滴粒径测量系统。该系统喷头xyz三维空间位置调节范围分别为0～0.9、0～0.8和0～0.7m,调整精度为±0.04mm;喷雾角度调节范围为0～360°,调整精度为±0.005°;喷雾压力调节范围为0.2～0.5MPa,相对误差不大于1.5%;风速调节范围为0～15m/s,相对误差不大于4.17%。雾滴粒径风速影响特性试验表明,常用的3个粒径统计项D32、D43和DV0.5随风速增加而增大,其平均变化率分别为2.62、3.59和6.83μm·s/m,速度从3m/s增加到15m/s时,三者分别增加46%、26%和71%;雾滴粒径喷雾压力影响特性试验表明,D32、D43和DV0.5随压力增加而减小,其平均变化率分别为90.33、232.3和300.2μm/MPa,喷雾压力从0.2MPa增加到0.5MPa时,三者分别减小31%、36%和56%,表明风速和喷雾压力对雾滴粒径影响较大,在喷雾系统中进行风速和压力选择时需着重考虑其对粒径变化的影响。

英文摘要：

In order to easily test droplet size in different spraying conditions, a droplet size measuring system of air-assisted spraying was designed. The system can accurately regulate nozzle position, spraying angle, spraying pressure and wind speed. The adjustment ranges of nozzle xyz three-dimensional position are 0-0.9, 0-0.8 and 0-0.7 m with adjustment accuracy of 0.04 mm, while the adjustment range of spraying angle is 0-360° with adjustment accuracy of 0.005°. The spraying pressure adjustment range is 0.2-0.5 MPa, and the relative error is not more than 1.5%. The wind speed adjustment range is 0-15 m/s, and the relative error is not more than 4.17%. The test results of influence of wind speed on droplet size show that the commonly used three statistics items D32、D43 and DV0.5 increase as wind speed rising, and the average rates of change of the three statistics are 2.62, 3.59 and 6.83 μm？s/m. When the wind speed increases from 3 to 15 m/s, the three statistics increase by 46%, 26% and 71% respectively. The test results of influence of spraying pressure on droplet size show that D32、D43 and DV0.5 increase as spraying pressure rising, and the average rates of change of the three statistics are -90.33, -232.3 and -300.2 μm/MPa respectively. When the pressure changes from 0.2 to 0.5 MPa, the three statistics decrease by 31%, 36% and 56%. It can be concluded that wind speed and spraying pressure affect droplets size much, and the influence should be considered when the two factors are controlled in spraying system.