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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Vortex shedding flow patterns and their transitions in oscillatory flows past parallel-plate thermoacoustic stacks
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Vortex shedding flow patterns and their transitions in oscillatory flows past parallel-plate thermoacoustic stacks

机译：涡流脱落流型及其在经过平行板热声叠层的振荡流中的过渡

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This paper investigates vortex shedding phenomena occurring at the end of the parallel-plate thermoacoustic stacks, in oscillatory flow conditions induced by an acoustic standing wave. Phase-locked Particle Image Velocimetry(PIV)measurement technique is used to identify a range of vortex shedding flow patterns within an acoustic cycle, in particular during the "ejection stage", when the fluid flows out of the stack. As an extension of the earlier work[X. Mao, Z. Yu, A.J. Jaworski, D. Marx, PIV studies of coherent structures generated at the end of a stack of parallel plates in a standing wave acoustic field, Experiments in Fluids 45(5)(2008)833-846]this paper reports experimental results obtained for a much wider range of parameters in order to identify detailed relationships between vortex flow patterns and experimental conditions. In addition to the flow patterns observed previously, current results show several new flow phenomena related to the evolution of vortices shed in the ejection stage. This work also attempts to classify systematically the types of the vortex wake patterns using three dimensionless parameters: the Reynolds number(Re), Keulegan-Carpenter number(KC)and Womersley number(Wo). In the(Re, KC)plane(Re is up to 5000, KC is up to 250), four flow pattern regions are defined according to the characteristics of nine types of vortex wake "transitions". It is proposed that Wo plays an important role in determining the detailed classification of such transitions within each flow pattern region. Furthermore, the physical mechanisms behind different types of wake patterns and their relationship with the dimensionless parameters investigated have been discussed.
机译：本文研究了在声波引起的振荡流动条件下，平行板热声叠层末端发生的涡旋脱落现象。锁相粒子图像测速（PIV）测量技术用于确定在声学循环内，尤其是在“喷射阶段”，当流体从烟囱中流出时，涡流脱落的流型范围。作为早期工作的扩展[X.毛祖瑜，A.J. Jaworski，D. Marx，在驻波声场中在平行板叠的末端生成的相干结构的PIV研究，《流体实验》 45（5）（2008）833-846]为了确定涡流模式与实验条件之间的详细关系，参数范围更广。除先前观察到的流动模式外，当前结果还显示了几种新的流动现象，这些现象与喷射阶段所散发的涡流有关。这项工作还尝试使用三个无因次参数对涡流尾流模式的类型进行系统分类：雷诺数（Re），Keulegan-Carpenter数（KC）和Womersley数（Wo）。在（Re，KC）平面中（Re最高为5000，KC最高为250），根据九种类型的涡旋“过渡”的特征定义了四个流场区域。建议Wo在确定每个流型区域内此类过渡的详细分类中起重要作用。此外，还讨论了不同类型的唤醒模式背后的物理机制及其与研究的无量纲参数的关系。

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