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首页> 外文会议>ASME(American Society of Mechanical Engineers) Pressure Vessels and Piping Conference 2006 vol.4 pt.B: Fluid-Structure Interaction >INTERFERENCE BETWEEN TWO TANDEM CYLINDERS OF DIFFERENT DIAMETERS
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INTERFERENCE BETWEEN TWO TANDEM CYLINDERS OF DIFFERENT DIAMETERS

机译：两个直径不同的串联圆柱之间的干扰

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摘要

This paper presents a detailed investigation of Strouhal frequencies, forces and flow structures resulting from the interference between two tandem cylinders of different diameters. The upstream cylinder diameter (d) was varied from 25 mm to 6 mm, while the downstream cylinder diameter (D) of 25 mm was unchanged, the corresponding diameter ratio, d/D, being 1.0 ～ 0.24. The spacing between the cylinders was 5.5d. At this spacing, the shear layers separated from the upstream cylinder roll up alternately, forming a vortex street in the gap between and behind the cylinders. Two dominant frequencies are detected behind the downstream cylinder at d/D = 1.0 ～ 0.4. One is the same as detected between the cylinders, and the other is of relatively low frequency and is probably generated by the downstream cylinder. Whilst the former remains unchanged, the latter increases with decreasing d/D, due to an increase in the incident flow velocity of the downstream cylinder. The time-averaged drag on the downstream cylinder also increases with decreasing d/D, though the fluctuating forces drop because vortices impinging upon the downstream cylinder are impaired by decreasing d/D.
机译：本文详细研究了两个直径不同的串联气缸之间的干涉导致的斯特劳哈尔频率，力和流动结构。上游气缸直径（d）从25 mm变为6 mm，而下游气缸直径（D）保持25 mm，相应的直径比d / D为1.0〜0.24。气缸之间的间距为5.5d。在此间距下，与上游圆柱体分离的剪切层交替卷起，在圆柱体之间和后面的间隙中形成涡街。在d / D = 1.0〜0.4时，在下游圆柱后面检测到两个主频。一个与在气缸之间检测到的相同，另一个频率相对较低，并且很可能是由下游气缸产生的。前者保持不变，但后者由于下游气缸的入射流速的增加而随着d / D的减小而增加。下游气缸上的时均阻力也随着d / D的减小而增加，尽管波动力下降是因为减小d / D会削弱冲击下游气缸的涡流。

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