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首页> 外文会议>Canadian Congress of Applied Mechanics(CANCAM 2005); 20050530-0602; Montreal(CA) >Effect of Cylinder Diameter on Acoustic Resonance of Two Tandem Cylinders in Cross-Flow
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Effect of Cylinder Diameter on Acoustic Resonance of Two Tandem Cylinders in Cross-Flow

机译：圆柱直径对交叉流中两个串联气缸的声共振的影响

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摘要

Flow-excited acoustic resonance of ducts containing clusters of bluff bodies is a design concern in many engineering applications such as tube bundles of heat exchangers and boilers. A crucial event in the mechanism of acoustic resonance is the ability of sound to modulate, and essentially "lock-in", the process of vortex shedding. While this phenomenon is relatively well understood for the case of isolated cylinders, there are many unresolved issues for the more complex case of multiple cylinders in close proximity. Recent studies have shown that the aeroacoustic response of two-tandem cylinders in cross-flow can be considerably different from that of a single cylinder under similar flow conditions. In the tandem cylinders case, strong resonance of a given mode occurred over two different ranges of flow velocity, which is in contrast with the single cylinder case for which the resonance occurs over a single velocity range. Although this unique behaviour was observed only inside the proximity interference region for which L/D is the parameter controlling the flow regimes, where L is the center-to-center distance between the cylinders, it is shown here that the cylinder diameter D has a strong influence on the mechanism of acoustic resonance excitation.
机译：在许多工程应用中，例如换热器和锅炉的管束中，包含钝体簇的管道的流动激发声共振是设计关注的问题。声共振机制中的一个关键事件是声音调制和实质上“锁定”涡旋脱落过程的能力。尽管对于孤立的汽缸来说，这种现象是比较容易理解的，但对于多个汽缸非常接近的更复杂的情况，仍然存在许多未解决的问题。最近的研究表明，在相似的流动条件下，双串联气缸在横流中的空气声响应可能与单个气缸中的空气声响应有很大不同。在串联气缸情况下，给定模式的强共振在两个不同的流速范围内发生，这与在单个速度范围内发生共振的单气缸情况相反。尽管仅在L / D是控制流动状态的参数的邻近干扰区域内观察到了这种独特行为，其中L是圆柱体之间的中心距，但此处显示的圆柱体直径D为强烈影响声共振激发的机理。

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