实验研究平面对称剪切流中的螺旋涡 蒋运幸·谢锡麟麻伟巍 东华大学理学院上海201620,Email:2111329@mail.dhu.edu.cn 2.复旦大学力学与工程科学系上海200433) 摘要:本文通过自行研制的平面剪切流设备,在一定的风速比下产生螺旋涡结构。运 用流动显示技术,直观观察到螺旋涡结构的产生,非归并以及归并的现象,并且得到了相 应的风速比范围。同时通过动态测量技术,通过自功率谱、互谱和空间相位斑图对螺旋涡 的非归并以及归并情形所对应的频率、波速以及波数做了定量分析。 关键词:平面对称剪切流,螺旋涡结构,流动显示,动态测量 中图分类号:O35 文献标识码:A Experimental studies on helical vortex structures in planar-symmetric shear flows JIANG Yun-xing XIE Xi-lin MA Wei-w (1. College of Science, Donghua University, Shanghai 201620, China 2 Department of Mechanics& Engineering Science, Fudan University, Shanghai 200433, China) Abstract: In this study, we observed and analyzed some spatial evolution of helical vortex by self-developed flow facility. Some typical phenomenon are observed directly by using the flow visualization, such as the formation of different spiral vortex structures and their characteristics owing to different values of the velocity ratio. Furthermore, with dynamic surveying technology, we research the typical flow field which we studied by using of auto-power spectrum. cross-spectrum and multiple-spectrum. We analysis the frequency, wave velocity and wave number of two different patterns which merging and non-merging of the helical vortex structures Key words: planar-symmetric shear flows; helical vortex structures; flow visualization; dynamic surveying 基金项目:国家自然科学基金面上项目(10872051 作者简介:蒋运幸(1989-),女,青海西宁人,硕士研究生 通信作者:麻伟巍, Email: mwwadhuedu cn Project supported by foundation: Supported by the National Natural Science Foundation of China(10872051) Biography: JIANG Yun-xing(1989-), Female, Master Candidate. Correspondingauthor:MAWei-wei,Email:mww@dhu.edu.cn实验研究平面对称剪切流中的螺旋涡* 蒋运幸 1 谢锡麟 2 麻伟巍 1 (1. 东华大学 理学院 上海 201620，Email: 2111329@mail.dhu.edu.cn 2.复旦大学 力学与工程科学系 上海 200433） 摘 要：本文通过自行研制的平面剪切流设备，在一定的风速比下产生螺旋涡结构。运 用流动显示技术，直观观察到螺旋涡结构的产生，非归并以及归并的现象，并且得到了相 应的风速比范围。同时通过动态测量技术，通过自功率谱、互谱和空间相位斑图对螺旋涡 的非归并以及归并情形所对应的频率、波速以及波数做了定量分析。 关 键 词：平面对称剪切流，螺旋涡结构，流动显示，动态测量 中图分类号：O35 文献标识码：A Experimental studies on helical vortex structures in planar-symmetric shear flows JIANG Yun-xing1 , XIE Xi-lin2 , MA Wei-wei1 (1. College of Science, Donghua University, Shanghai 201620, China; 2. Department of Mechanics & Engineering Science, Fudan University, Shanghai 200433, China） Abstract: In this study, we observed and analyzed some spatial evolution of helical vortex by self-developed flow facility. Some typical phenomenon are observed directly by using the flow visualization, such as the formation of different spiral vortex structures and their characteristics owing to different values of the velocity ratio. Furthermore, with dynamic surveying technology, we research the typical flow field which we studied by using of auto-power spectrum, cross-spectrum and multiple-spectrum. We analysis the frequency, wave velocity and wave number of two different patterns which merging and non-merging of the helical vortex structures. Key words: planar-symmetric shear flows; helical vortex structures; flow visualization; dynamic surveying * 基金项目：国家自然科学基金面上项目（10872051） 作者简介：蒋运幸（1989），女，青海西宁人，硕士研究生. 通信作者：麻伟巍，Email: mww@dhu.edu.cn Project supported by foundation: Supported by the National Natural Science Foundation of China（10872051） Biography: JIANG Yun-xing(1989), Female, Master Candidate. Corresponding author: MA Wei-wei, Email: mww@dhu.edu.cn