全场彩虹技术测量喷雾浓度及粒径分布  

Concentration and size measurements of sprays with global rainbow technique

作　　者：吴迎春[1] 吴学成[1] Sawitree Saengkaew 姜淏予[1] 洪巧巧[1] Gérard Gréhan 岑可法[1] 

机构地区：[1]浙江大学能源工程学系能源清洁利用国家重点实验室,杭州310027 [2]UMR 6614/CORIA,LABEX EMC3,Centre National de la Recherche Scientifique,Universite et Institut National des Sciences Applique s de Rouen,Site du Madrillet,Avenue de l'Universite,BP12 76801 Saint Etienne du Rouvray,France

出　　处：《物理学报》2013年第9期76-83,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:51176162);国家重点基础研究发展计划(973计划)(批准号:2009CB219802);十二五国家科技支撑计划(批准号:2012BAB18B03);高等学校学科创新引智计划(批准号:B08026)资助的课题~~

摘　　要：喷雾颗粒的浓度、粒径等多参数的同时测量是研究喷雾的关键.对应用全场彩虹技术测量双组分液滴的浓度及粒径分布进行了研究.基于改进的Nussenzweig理论,对液滴折射率和粒径分布采用无分布函数算法进行最优化求解,然后通过折射率与浓度的关系反推液滴浓度.用模拟全场彩虹信号对该算法进行了验证,该算法可准确反演具有单峰分布、双峰分布粒径特征的液滴群的折射率与粒径分布.并对体积分数从0%到100%的乙醇溶液喷雾进行了实验测量,结果表明,所测得折射率与理论值符合,粒径分布稳定.该技术在喷雾浓度测量方面具有广阔的应用前景.Simultaneous measurement of the concentration and size of spray droplets plays an important role in understanding sprays. The global rainbow technique is applied to measure the concentration and size of bi-component droplets. Based on the modified Nussenzweig theory, the refractive index and size distribution are optimally evaluated, and then the concentration is retrieved with prior relationship between the refractive index and concentration. The inverse algorithm is verified by the simulated global rainbow signals; results shows that it can accurately retrieve the refractive index and size distribution of the droplets with an unimodal or bimodal particle size distribution. Sprays of water-ethanol solution with volume concentration from 0% to 100% are measured. Results show that the measured refractive indices agree well with the exact values, and the size distribution is stable. The global rainbow technique shows great potential in concentration measurement of spray droplets.

关 键 词：全场彩虹技术 折射率 粒径 组分 

分 类 号：O439[机械工程—光学工程]