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首页> 外文期刊>Journal of Hydrodynamics >FORCES ON A NEAR-WALL CIRCULAR CYLINDER
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FORCES ON A NEAR-WALL CIRCULAR CYLINDER

机译：近壁圆形圆柱上的力

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The pressure distribution around a near-wall smooth circular cylinder in cross-flow was mainly investigated. The experiment was conducted at the sub-critical Reynolds number ranging from 2. 24 · 10~4 to 8. 94 · 10~4, at which the regular vortex separation exists on an isolated circular cylinder. The experimental results indicate that the forces on a circular cylinder near a plane wall are different from those on an isolated circular cylinder. Drag and lift coefficients of a near-wall circular cylinder strongly depend on gap ratio. The increase of gap ratio results in the increase of drag coefficient and the declination of lift coefficient, drag coefficient ranges from 0. 5 to 1. 0, and lift coefficient from 0. 25 to 0 when gap ratio gradually increases from 0 to 1. 0, and then the forces tend to be nearly constant with the increase of gap ratio. The attraction between a cylinder and a plane wall, i. e. , downward force, occurs when gap ratio lies in certain range. The existence of cylinder changes the pressure gradient on the plane wall, and the influence extends to the location where x/D < - 3.0 and x/D > 5. 0 .
机译：主要研究了横流情况下近壁光滑圆柱体周围的压力分布。实验是在亚临界雷诺数为2. 24·10〜4到8。94·10〜4的条件下进行的，此时在孤立的圆柱体上存在规则的涡旋分离。实验结果表明，平面壁附近的圆柱体上的力与孤立的圆柱体上的力不同。近壁圆柱体的阻力和升力系数很大程度上取决于间隙比。当间隙比从0逐渐增加到1时，间隙比的增加导致阻力系数和升力系数的偏斜增加，阻力系数从0. 5到1. 0，升力系数从0. 25到0。 0，则随着间隙比的增加，力趋于几乎恒定。圆柱和平面壁之间的吸引力，即e。当间隙比在一定范围内时，发生向下的力。圆柱的存在改变了平面壁上的压力梯度，并且影响延伸到x / D <-3.0和x / D> 5. 0的位置。

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