喷洒水滴直径面粉测定法改进

摘要

Flour method is extensively used in the sprinkler droplet size measurement. The traditional calibration equation only considered the relationship between dried pellet mass and droplet diameter. The effects of droplet diameter, droplet impact angle and impact velocity on dried pellet mass were discussed through the orthogonal test. The results showed that droplet size and impact angle had significant influences on dried pellet mass while droplet impact velocity had little influence. A modified calibration equation considering two factors of droplet size and impact angle was established. The modified calibration equation had high calculation accuracy compared with the traditional one. The method of measuring sprinkler droplet using the modified calibration equation was presented with the application of the droplet dynamics-evaporation model.%面粉法是一种应用广泛的水滴直径测定方法.以往水滴率定时只考虑干面粉团质量与水滴直径的关系,而忽略水滴打击角度和打击速度对水滴直径的影响.通过正交试验设计进行了喷洒水滴直径、打击角度和打击速度对干面粉团质量影响的试验研究.显著性分析结果表明:水滴直径和打击角度对干面粉团质量的影响非常显著,而水滴打击速度对其影响较小.建立了考虑水滴直径和打击角度双因素共同作用的改进率定公式.与传统率定公式相比,改进的率定公式具有较高精度.结合水滴运动蒸发模型,提出了应用改进的率定公式测定喷洒水滴直径的基本方法.