摘要
该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,以及非归并和归并的现象,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。
In this study, some spatial evolution of helical vortex by self developed flow facility are observed and analyzed. Some typical phenomena 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, the typical flow field is investigated with dynamic surveying technology which includes using of auto-power spectrum, cross-spectrum and multiple-spectrum. Finally, the frequency, wave velocity and wave number of two different patterns （merging and non-merging of the helical vortex structures） are analyzed.
出处
《水动力学研究与进展（A辑）》
CSCD
北大核心
2013年第5期626-632,共7页
Chinese Journal of Hydrodynamics
基金
国家自然科学基金面上项目(11172069)~~
关键词
平面对称剪切流
螺旋涡结构
流动显示
动态测量
planar-symmetric shear flows
helical vortex structures
flow visualization
dynamic surveying
