Acoustics-driven vortex dynamics in channel branches with round intersections: Flow mode transition and three-dimensionality
Acoustics-driven vortex dynamics in channel branches with round intersections: Flow mode transition and three-dimensionality
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具有圆形交叉点的通道分支中声学驱动的涡动力学：流动模式转变和三维
DOI：
10.1063/1.5141609
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发表时间：
2020-02
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;Li He;Yingzheng Liu
本文采用实验和大涡模拟相结合的方法，研究了圆形交叉口管道内声驱动涡的动力学特性。全面论证了圆形交叉口与柯恩达效应密切相关的基本流态转换和强化流的三维性related.to首先使用动态压力传感器阵列来建立激励的声压脉动与通道-分支交叉半径（r）和主流通道数的关系。在补充模拟中，选择了r/D = 0、0.2和0.4（其中D是侧支的短边）的三种构型进行演示。首先，模拟结果得到了很好的验证，在声压脉动和相位相关的流。随后对时间平均和统计流量特性的分析表明，在r/D = 0.2和0.4的圆形通道分支内存在明显增强的流量波动。接下来，适当的正交分解分析进行。提取的主导流动模式，并确定能量过渡从流向涡脱落模式垂直流动振荡。模式。为此，进一步研究了流型转换对相控流场的影响。加强的分支流条纹导致通道流动从同向旋转涡对的同步对流转变为单个大尺度涡的交替对流，从而产生更强的主流拍动运动。最后，本文还发现，圆形通道支管内部的三维强化流动，即必要的展向雷诺剪应力，与主流的拍动和支管的垂向分支流振荡所引起的强烈湍流混合过程有关。presented.by这些结果对工业管道的设计和优化具有重要意义。
A combined experimental and large eddy simulation study was conducted to investigate acoustics-driven vortex dynamics inside channel.branches with round intersections. The underlying flow mode transition and intensified flow three-dimensionality, which are closely related.to the Coanda effect at round intersections, were comprehensively demonstrated. A dynamic pressure transducer array was first used to establish.the relationship of the excited acoustic pressure pulsations to the channel-branch intersection radius (r) and the mainstream Reynolds.number. In complementary simulations, three configurations with r/D = 0, 0.2, and 0.4 (where D is the short edge of the side-branch) were.selected for demonstration. First, the simulated results were well validated in terms of acoustic pressure pulsations and phase-dependent flow.fields. Subsequent analysis of the time-averaged and statistical flow characteristics revealed the existence of significantly intensified flow fluctuations.inside the round channel branches having r/D = 0.2 and 0.4. Next, the proper orthogonal decomposition analysis was conducted to.extract the dominant flow modes and to identify the energy transition from the streamwise vortex-shedding mode to vertical flow-oscillation.mode. To this end, the influence of flow-mode transition on the phase-dependent flow fields was further investigated. The intensified branchflow.streaks resulted in a channel flow transition from synchronous convection of co-rotating vortex pairs into alternating convection of a.single large-scale vortex, yielding a stronger flapping motion of the mainstream flow. Finally, the intensified flow three-dimensionality, presented.by the essential spanwise Reynolds shear stresses inside the round channel branches, was found to relate to the strong turbulent mixing.process caused by the flapping mainstream flow and the vertical branch flow oscillation. These findings are of great significance for industrial.pipeline design and optimization.
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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
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：
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作者：
Youjun Zhu;O. Hua;Z. Du
通讯作者：
Youjun Zhu;O. Hua;Z. Du
影响因子：
1
作者：
D. Tonon;A. Hirschberg;J. Golliard;S. Ziada
通讯作者：
D. Tonon;A. Hirschberg;J. Golliard;S. Ziada
影响因子：
2.4
作者：
Graftieaux, L;Michard, M;Grosjean, N
通讯作者：
Grosjean, N
影响因子：
4.7
作者：
J. Bruggeman;A. Hirschberg;M. V. Dongen;A. Wijnands;J. Gorter
通讯作者：
J. Bruggeman;A. Hirschberg;M. V. Dongen;A. Wijnands;J. Gorter