Intensified flow dynamics by second-order acoustic standing-wave mode: Vortex-excited acoustic resonances in channel branches
Intensified flow dynamics by second-order acoustic standing-wave mode: Vortex-excited acoustic resonances in channel branches
复制标题
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
DOI：
10.1063/1.5086443
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发表时间：
2019-03
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;Yingzheng Liu
第二声驻波模式增强了流动动力学，内部叠加了涡激声共振。实验研究了具有同轴侧分支的通道。在实验中，旋涡激励的频率锁定范围。首先通过比较壁面压力波动和模拟声驻波模式来确定声共振。愈演愈烈。采用粒子图像测速法（PIV）测量了第二声驻波模式下的流动动力学；流动动力学是。同时测量时与第一驻波模式耦合进行比较。结果表明，剪切层在上部发育。支路入口可分为三个区域，即发展区、过渡区和崩溃区。这两个的。在发育区和过渡区，剪切层的动量厚度和增长速度明显增强。第二驻波模式。脱落涡、再循环带和同步流的时空演变。通过锁相PIV测量来识别条纹。在二阶调制时，脱落涡从再循环区下方脱离，冲击下游分支角，而在一阶调制时，脱落涡直接与再循环区汇合。最后，利用Howe’s方法揭示了涡旋动力学与驻波之间的气声能量传递。空气声学的类比。驻波传递的能量促进了脱落涡的形成和发展。而对流产生的能量和脱落涡的坍缩维持了驻波的传播。的。在一个二阶声共振周期内产生的累积气声能量可达产生的150倍。在一个一阶循环中。
The intensified flow dynamics by the second acoustic standing-wave mode, superimposed with vortex-excited acoustic resonances inside.a channel with coaxial side-branches, were experimentally investigated. In the experiments, the frequency lock-on range of vortex-excited.acoustic resonances was determined first by comparing wall pressure fluctuations and simulated acoustic standing-wave modes. The intensified.flow dynamics by the second acoustic standing-wave mode were measured by particle image velocimetry (PIV); the flow dynamics were.also measured when coupled with the first standing-wave mode for comparison. The results demonstrate that shear layer developments over.the branch entrance can be classified into three regions, i.e., the developing region, the transition region, and the collapsing region. Both the.momentum thickness and the growth rate of the shear layer were significantly intensified in the developing and transition regions by the.second standing-wave mode. The subsequent spatiotemporal evolutions of the shedding vortex, recirculation zone, and synchronous flow.streaks were identified by the phase-locked PIV measurements. With second-order acoustic modulations, the shedding vortex breaks away.from beneath the recirculation zone to impinge the downstream branch corner while directly converging with the recirculation zone during.first-order modulation. Finally, the aeroacoustic energy transfer between vortex dynamics with standing waves was revealed using Howe’s.aeroacoustic analogy. The energy transferred from the standing-waves contributed to the formation and development of the shedding vortex,.while the energy produced by convection and the collapsing of the shedding vortex maintained the standing waves’ propagations. The.accumulated aeroacoustic energy produced during one second-order acoustic resonance cycle was found to be up to 150 times that produced.during one first-order cycle.
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影响因子：
3.6
作者：
Zhang, Qingshan;Liu, Yingzheng;Wang, Shaofei
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影响因子：
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作者：
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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：
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通讯作者：
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