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首页> 外文期刊>Applied Ocean Research >Hydrodynamic forces on a partially submerged cylinder at high Reynolds number in a steady flow
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Hydrodynamic forces on a partially submerged cylinder at high Reynolds number in a steady flow

机译：在稳定流动的高雷诺数处于部分浸没式圆柱体上的流体动力

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摘要

The hydrodynamic forces on the stationary partially submerged cylinder are investigated through towing test with Reynolds number ranging from 5 x 10(4) to 9 x 10(5). Three test groups of partially submerged cylinders with submerged depths of 0.25 D, 0.50 D, and 0.75 D and one validation group of fully submerged cylinders are conducted. During the experiments, the hydrodynamic forces on the cylinders are measured using force sensors. The test results show a considerable difference in the hydrodynamic coefficients for the partially submerged cylinders versus the fully submerged cylinders. A significant mean downward lift force is first observed for the partially submerged cylinders in a steady flow. The maximum of the mean lift coefficients can reach 1.5. Two distinct features are observed due to the effects of overtopping: random distributions in the mean drag coefficients and a clear quadratic relationship between the mean lift coefficients and the Froude number appear in the non-overtopping region. However, the novel phenomenon of a good linear relationship with the Froude number for the mean hydrodynamic coefficients is clearly shown in the overtopping region. In addition, fluctuating hydrodynamic coefficients are further proposed and investigated. These results are helpful to have a better understanding of the problem and to improve related structural designs.
机译：通过捕获试验，使用雷诺数为5×10（4）至9×10（5），通过牵引试验来研究静止部分浸没式圆柱体上的流体动力力。进行三个具有0.25d，0.50d和0.75d的浸没深度的部分浸没式圆柱体和一个完全浸没式汽缸的一个验证组。在实验期间，使用力传感器测量汽缸上的流体动力力。测试结果显示了部分浸没式圆柱体的流体动力系数相当差异，而完全浸没式汽缸。首先在稳定流动中为部分浸没式汽缸观察到显着的平均向下提升力。平均升力系数的最大值可以达到1.5。由于初始化的效果：平均升降系数和平均升力系数与FRoude数字之间的清晰二次关系出现在非初始化区域中的效果，观察到两个不同的特征。然而，在转换区域中清楚地示出了与平均流动力系数的弗劳德数的良好线性关系的新颖现象。此外，进一步提出和研究了波动的流体动力系数。这些结果有助于更好地理解问题并改善相关的结构设计。

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