Vortex dynamics during acoustic-mode transition in channel branches
Vortex dynamics during acoustic-mode transition in channel branches
复制标题
通道分支声模转变过程中的涡动力学
DOI：
10.1063/1.5117301
复制
发表时间：
2019-08
影响因子：
4.6
通讯作者：
Yingzheng Liu
中科院分区：
文献类型：
--
作者：
Peng Wang;Yifan Deng;Yingzheng Liu
采用锁相粒子图像测速技术（PIV）对管道分支中声模态转变过程中的涡动力学进行了实验研究。提出了一种基于动态模式分解（DMD）离线压力分析和现场可编程门阵列实时计算的实时波形识别方法。在离线DMD分析中，从压力传感器阵列测量的压力数据中提取声学模式转换期间的能量压力DMD模式，并且发现与从声学模式分析中数值确定的自然声学驻波模式吻合良好。声模转换过程分为三个连续的阶段：第一阶段：混合声调制，第二阶段：无声调制，第三阶段：三阶声调制。随后，对应于第一阶段和第三阶段的涡动力学是determined.by锁相PIV测量与实时波形识别方法。结果总结如下。(1)涡。动力学耦合的第一声驻波模式在第一阶段-I相关的第一剪切层流体动力学模式在通道。(2)在第一阶段，涡动力学与第二声驻波模态耦合，被认为是第二剪切层流体动力学模态的特征。(3)然而，在声学模式转变的第三阶段，由第三声驻波模式调制，相应的涡动力学完全发展成第二剪切层流体动力学模式。这项工作提供了一个更好的理解复杂的旋涡动力学的槽道流动与工业管道系统的广泛影响。
The vortex dynamics during acoustic mode transition in channel branches were experimentally investigated with phase-locking particle image.velocimetry (PIV) measurements. Particularly, a real-time waveform recognition approach, based on an offline pressure analysis by dynamic.mode decomposition (DMD) and a real-time computation by field programmable gate array, was established. In the offline DMD analysis,.energetic pressure DMD modes during acoustic mode transition were extracted from pressure data measured by a pressure transducer array.and found to agree well with the natural acoustic standing-wave modes numerically determined from an acoustic modal analysis. The acoustic.mode transition process was classified into three successive phases: Phase-I: hybrid acoustic modulations, Phase-II: no acoustic modulation,.and Phase-III: third-order acoustic modulation. Subsequently, the vortex dynamics corresponding to Phase-I and Phase-III were determined.by phase-locking PIV measurements with the real-time waveform recognition approach. The results are summarized as follows. (1) The vortex.dynamics coupled with the first acoustic standing-wave mode in Phase-I were related to the first shear layer hydrodynamic mode in channel.branches. (2) The vortex dynamics coupled with the second acoustic standing-wave mode in Phase-I were recognized as the signatures of the.second shear layer hydrodynamic mode. (3) However, in Phase-III of the acoustic mode transition, modulated by the third acoustic standingwave.mode, the corresponding vortex dynamics fully developed into a second shear layer hydrodynamic mode. This work provides a better.understanding of the complex vortex dynamics of channel flows with broad implications for industrial piping systems.
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二阶声驻波模式强化流动动力学：通道分支中的涡激声共振
影响因子：
4.6
作者：
Peng Wang;Yingzheng Liu
通讯作者：
Yingzheng Liu
影响因子：
4.6
作者：
H. Yokoyama;C. Kato
通讯作者：
H. Yokoyama;C. Kato
影响因子：
4.6
作者：
S. Pandian;S. Desikan;S. Niranjan
通讯作者：
S. Pandian;S. Desikan;S. Niranjan
DOI：
10.1243/09544100jaero636
发表时间：
2010-06
期刊：
Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering
影响因子：
--
作者：
Youjun Zhu;O. Hua;Z. Du
通讯作者：
Youjun Zhu;O. Hua;Z. Du
影响因子：
2.5
作者：
S. Dequand;Xisheng Luo;Jfh Jan Willems;A. Hirschberg
通讯作者：
S. Dequand;Xisheng Luo;Jfh Jan Willems;A. Hirschberg