摘要
根据实验测得的速度时间序列,分析了浸没循环撞击流混合器的流场时均速度分布状况,由流场速度大小和方向的规律,将流场划分为中心区、射流区、过渡区和回流区四个区域。在此基础上,根据混沌理论,对瞬时速度序列重构相空间,确定该混合器内的流场为混沌流场。通过改进传统的关联维计算方法,计算并分析了流场内瞬时速度序列的关联维分布状态,其变化范围在2.5~5.5。根据轴向与径向关联维值大小的差异,确定了轴向速度分量在该系统中的主导地位,发现了过渡区的边界层分离对流场流型变化的重要作用。此外还发现了除回流区外,流场的螺旋桨转速与系统关联维之间的同向变化规律。
The time averaged velocity distribution in flow field of Impinging Stream Mixer（ISM） was analyzed based on the experimental data of velocity-time serial.The flow field in ISM was divided into central region,impinging region,transition region and reflux region according to the magnitude and direction of velocity.The reconstructed phase space of instantaneous velocity series indicates that the flow field in ISM is a chaotic system.The correlation dimensions of instantaneous velocity series at different points were calculated by improved GP algorithm and the distribution conditions were analyzed.The results show that the value of correlation dimension of the instantaneous velocity ranges from 2.5 to 5.5 and the value in axial direction is larger than that in radial direction,which means that the axial direction velocity has a dominant effect in ISM flow field.The separation of boundary layer in transition region has an important infection on the flow pattern distribution of the flow field.The research also shows that the correlation dimension changes coincidently with the rotating speed of propeller except in the reflux region.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2013年第1期50-57,共8页
Journal of Chemical Engineering of Chinese Universities
基金
辽宁省自然科学基金(20102179
201202174)
辽宁省教育厅科技攻关计划项目(2009S079)
辽宁省百千万人才工程支持计划项目(2009921092)
关键词
撞击流
速度场
关联维
混沌吸引子
impinging stream
velocity field
correlation dimension
chaos attractor
