摘要
为揭示双轴差速立式捏合机混合釜内流场产生剪切及拉伸运动的机理,根据混合釜结构特征、桨叶运动特点以及固体推进剂物料特性,采用有限体积法建立综合动网格、用户自定义函数的三维数学模型,以VKM-5立式捏合机为研究对象,计算其功率准数、流场及压力场分布.结果表明:功率准数与实验实测值符合良好;捏合区、近壁区、釜底区存在轴向流、切向流、径向流的相互作用,且物料分别在正压力和负压力作用下做强烈的剪切运动和拉伸运动,物料混合剧烈程度依次为捏合区、近壁区、釜底区及其他区域.
The mechanism of shearing and stretching motions generated by the flow field of mixing tank was studied according to the structural characteristics of mixing tank,the motion trait of blade and the material characteristics of solid propellant.Taking VKM-5vertical kneader as a research object,the power number,flow field and pressure field distributions were calculated through finite volume method establishing the three-dimensional mathematical model of synthetical dynamic mesh and UDF.The results show that the power number is in good agreement with experimental results.The interaction between axial velocity,tangential velocity and radial velocity all exists in kneading zone,near-wall region and the bottom.Moreover,due to the positive pressure and negative pressure,strong shearing and stretching motions of materials are generated.The regions of mixing intensity from activity to moderation are kneading zone,near-wall region,the bottom of tank and other areas,respectively.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2015年第2期6-10,共5页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家重大科学仪器设备开发专项基金资助项目(2011YQ160002)
中央高校基本科研业务费专项资金资助项目(2010MS090)
关键词
立式捏合机
固体推进剂
流场特性
数值模拟
动网格
vertical kneader
solid propellant
flow field characteristics
numerical simulation
dynamic mesh
