摘要
雾滴谱作为衡量喷头雾化性能的重要指标,可用激光雾滴粒径仪测定,但是此设备成本高、操作复杂,不能方便快速地测得雾滴谱。该文以ULLN模型为基础,用3种雾滴谱DV0.1、DV0.5和DV0.9提供的信息作为已知条件,设计了Newton迭代格式并反算出ULLN模型中相关系数,从而确定了模型的具体表达形式,随后利用辛普森数值积分的方法,计算出各雾滴粒径分段所占体积百分率。理论上,由于雾滴谱分布函数已经确定,所以本算法可以计算得到任何雾滴粒径分段的体积百分率。将该方法计算得到的结果和美国俄亥俄州立大学开发的Driftsim软件计算结果进行了对比,结果表明该算法具有较高计算精度。
Droplet size distribution,as an important indicator,is usually used to evaluate the performance of nozzles.Laser particle analyzers are usually adopted for the droplet size distribution measurement but the apparatus have the disadvantages of high expense,complicated operation and can not obtain results conveniently.In this paper,a Newton iterative method based on ULLN model was designed to determine unknown parameters in this model by using information provided by droplet sizes including Dv0.1,Dv0.5,Dv0.9,and then the expressions of the model were definited.The volume percent of a specific range of droplet size was figured out by using numerical integration with Simpson method.This method could determine volume percent of any ranges of droplet size in theory,because ULLN model has been determined after those calculation progresses above.In the last,comparison between results calculated by this method and that by DRIFTSIM program revealed that the method in this research had higher calculation accuracy than DRIFTSIM program.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2009年第S2期78-82,共5页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家863项目(2006AA10A308)
北京市农委项目(20070110)资助
关键词
数值方法
雾滴
分布函数
ULLN
numerical methods,droplets,distribution functions,ULLN
