摘要
为了获取气体速率对油水分离动态特性的影响规律,考虑了油水汽气四相流、水滴蒸发相变等因素,建立了滤油机的油水分离流场的数学物理模型以及水滴运动蒸发的相变方程;分析了不同气体速率对油水分离过程中的油水气四相体积分数分布以及轴向脱水率的影响规律,表明了不同气体速率情况下油水汽气四相流的动态特性,且气体速率会显著影响油水分离的脱水效率,对深入研究滤油机的油水分离机理奠定前期基础。
The flow fieldandwater-vapor phase transition in the vacuum oil purifier,assisted by injection of dry air,were approximated,formulated with the model of oil / water / vapor / air phases,theoretically analyzed and experimentally evaluated. The influence of the air speed on the volume fraction distributions,dynamic characteristics of the four phases,and the axial dehydration rate was investigated. The calculated results show that the air speed significantly affects the axial dehydration rate and volume fraction distributions. For example,as the speed increases,the axial volume fraction of oil gradually decreases,accompanied by an improved homogeneity; the axial volume fraction gradient of water increases because air and water vapor rapidly move towards the pumping-holeand the bottom of the separation plate. As the speed increases to 60 m / s,the dehydration rate changes in an increase-decrease mode; when the oil-water mixture pass the separation plate,the dehydration rate rapidly reaches a peak. The calculated and measured results were found to be in good agreement.
出处
《真空科学与技术学报》
EI
CAS
CSCD
北大核心
2015年第10期1231-1237,共7页
Chinese Journal of Vacuum Science and Technology
基金
国家自然科学基金(51375516)
重庆基础与前沿研究项目(cstc2014jcyj A90015
cstc2013jcyj A90021)
重庆市教育科学技术研究项目(KJ130710)
重庆市应用开发重点项目(cstc2014yykf B90002)
重庆市教委科技资助重点项目(KJZH14210)
教育部平台科技资助项目(fykf201509)
关键词
气体速率
油水分离
四相流
脱水率
Gas rate
Water / oil separation
Four-phase flow
Dehydration rate
