气液两相流多尺度相干结构及其间歇性  

Multi-scale coherent structures and intermittency in-gas-liquid two-phase turbulent flow

作　　者：陈文义[1,2] 郭莎莎[1,2] 姜楠[3] 

机构地区：[1]河北工业大学过程装备与控制工程系,天津300130 [2]河北工业大学工程流动与过程强化研究中心,天津300130 [3]天津大学力学系,天津300072

出　　处：《黑龙江科技学院学报》2012年第4期387-392,共6页Journal of Heilongjiang Institute of Science and Technology

基　　金：河北省自然科学基金项目(E2012202109);石家庄科学技术研究与发展项目(11108271A)

摘　　要：小波分析用于流体力学的研究已有一定的进展,采用恒温热膜测速技术,以高于对应的最小湍流时间尺度分辨率,精细的测量了鼓泡塔内不同空间位置的瞬时气液两相流动速度信号。基于子波系数的瞬时局部平坦因子,提出用子波分析检测湍流多尺度相干结构的条件采样方法,以单气泡结构的相位平均波形为基础,对鼓泡塔内气液两相湍流场进行了研究。结果表明:鼓泡塔中气泡结构是两相湍流产生奇异性和间歇性的诱因,喷嘴出口区域的一定喷射锥角范围内,才有气泡结构,并受到对应的平坦因子及间歇性的影响。This paper is concerned with the fine measurement of the instantaneous velocity time sequence of gas-liquid two-phase turbulent flow at different spatial locations in a reflux reactor by the constant-temperature hot-film anemometer.The paper describes development of a conditional sampling technique using instantaneous intensity factor and flatness factor of wavelet coefficients to discriminate the multi-scale coherent structures in gas-liquid two-phase turbulent flow and introduces the use of the method based on the phase-averaged waveforms of the structure of the single bubble to the study about gas-liquid two-phase turbulent flow in the bubble column.The results show that the bubble structure in the bubble column results in occurrence of singularity and intermittency in the gas-liquid two-phase turbulent flow.Only within the certain spray cone angle are some bubble structures found,and affected by the corresponding flat factor and intermittency.

关 键 词：气液两相流 条件相位平均波形 间歇性 平坦因子 

分 类 号：O357[理学—流体力学]