CAJ | 학술논문

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.
근거실험측득적속도시간서렬,분석료침몰순배당격류혼합기적류장시균속도분포상황,유류장속도대소화방향적규률,장류장화분위중심구、사류구、과도구화회류구사개구역.재차기출상,근거혼돈이론,대순시속도서렬중구상공간,학정해혼합기내적류장위혼돈류장.통과개진전통적관련유계산방법,계산병분석료류장내순시속도서렬적관련유분포상태,기변화범위재2.5~5.5.근거축향여경향관련유치대소적차이,학정료축향속도분량재해계통중적주도지위,발현료과도구적변계층분리대류장류형변화적중요작용.차외환발현료제회류구외,류장적라선장전속여계통관련유지간적동향변화규률.
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.