【作者】 蒋运幸； 谢锡麟； 余飞龙； 麻伟巍；

【Author】 JIANG Yun-xing 1,XIE Xi-lin 2,YU Fei-long 2,MA Wei-wei 1 (1.College of Science,Donghua University,Shanghai 200051 2.Department of Mechanics & Engineering Science,Fudan University,Shanghai 200433)

【机构】 东华大学理学院； 复旦大学力学与工程科学系；

【摘要】 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,利用自功率谱、互谱和空间相位斑图等实验方法,对于螺旋涡非归并以及归并(对应速度比R=1/3,0.47),对流场呈现流向螺旋结构空间演化的两种不同形态的频率、波速以及波数做了相应的分析。更多还原

【Abstract】 In this paper,we discuss the structure of spiral vortex with different wind speed scale made by self-developed equipment of planar-symmetric shear flows.The generating process of spiral vortex and the phenomenons of merging or non-merging are observed directly by useing the flow visualization.By the way,we get the range of the corresponding wind speed scale.At the same time,with dynamic surveying technology,we make sure that the flow field generate streamwise spiral vortex which we studied after then by seing the experimental method of self-spectrum, cross-spectrum and phase pattern.Then we analysis the frequency,wave velocity and wave number of two different patterns which are merging and non-merging(speed scale R=l/3,0.47) of the spiral structure’s spatial evolution.更多还原