Vortex ring evolution in an impulsively started jet using digital particle image velocimetry and continuous wavelet analysis
Vortex ring evolution in an impulsively started jet using digital particle image velocimetry and continuous wavelet analysis
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使用数字粒子图像测速和连续小波分析研究脉冲启动射流中的涡环演化
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
M. Riethmuller
中科院分区：
文献类型：
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作者：
C. Schram;M. Riethmuller
将数字粒子图像测速技术与小波分析相结合，研究了脉冲起动射流中产生的超前涡环的特性。小波分析允许一个，凭借其在空间和尺度上的选择性的属性，检测相干结构和计算它们的位置和大小，并通过进一步的处理，它们的对流速度和环流。已经观察到，甚至在它从产生它的射流剪切层夹断之后，领先的涡环的能量也持续增加。
Digital particle image velocimetry and wavelet analysis are combined in this work in order to study the characteristics of the leading vortex ring generated in an impulsively starting jet flow. The wavelet analysis allows one, by virtue of its properties of selectivity in space and scale, to detect coherent structures and to compute their position and size and, through further processing, their convection velocity and circulation. It has been observed that the energy of the leading vortex ring continuously increases even after it has pinched off from the jet shear layer generating it.