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首页> 外文期刊>Ocean Engineering >Hydrodynamic coefficients of a yawed square cylinder in oscillatory flows
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Hydrodynamic coefficients of a yawed square cylinder in oscillatory flows

机译：摇摆流中偏航方形圆柱体的水动力系数

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摘要

The effect of yaw angle (a) on hydrodynamic forces and vortex shedding regime classification of a square cylinder oscillating in still water is examined. The Independent Principle (IP), which states that the Strouhal number and the drag coefficient are independent of a if the normal velocity component is used, was examined in oscillatory flows. Hydrodynamic forces were measured over a Keulegan-Carpenter number (KC) range of 3-30 and a Stokes parameter (beta) range of 500-1600. For KC=8-20, the drag coefficient at alpha=45 degrees is about 46% higher than that at alpha=0 degrees, indicating the invalidity of the IF in oscillatory flow over this KC range. The inertia coefficient decreases with the increase of the yaw angle, except for KC=8-20, where the sudden drop in the distribtition is absent at alpha=45 degrees. Apart from this KC range, the inertia coefficient follows the IF better than the drag coefficient does. In addition, the lift coefficient increases with the increase of cylinder yaw angle. The results of the lift force spectra and the lift coefficients imply that the existence of the cylinder yaw angle has an intensified effect on the vortex shedding process around a square cylinder in oscillatory flows.
机译：研究了偏航角（a）对在静水中振荡的方筒的流体动力和涡旋脱落状态分类的影响。在振荡流中检查了独立原理（IP），该原理指出，如果使用法向速度分量，则Strouhal数和阻力系数与a无关。在3-30的Keulegan-Carpenter数（KC）范围和500-1600的Stokes参数（beta）范围内测量了流体动力。对于KC = 8-20，在α= 45度的阻力系数比在α= 0处的阻力系数高约46％，这表明IF在此KC范围内的振荡流中无效。惯性系数随偏航角的增加而减小，但KC = 8-20除外，其中在α= 45度时不存在分配的突然下降。除此KC范围外，惯性系数比阻滞系数更好地遵循IF。另外，升力系数随着汽缸偏航角的增加而增加。升力谱和升力系数的结果表明，圆柱偏航角的存在对振荡流中方形圆柱周围的涡旋脱落过程具有增强的影响。

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  • 来源
    《Ocean Engineering》 |2017年第15期|510-522|共13页
  • 作者

    Lou X.; Zhou T.; Cheng L.;

  • 作者单位

    Univ Western Australia, Sch Civil Environm & Min Engn, 35 Stirling Highway, Crawley, WA 6009, Australia;

    Univ Western Australia, Sch Civil Environm & Min Engn, 35 Stirling Highway, Crawley, WA 6009, Australia;

    Univ Western Australia, Sch Civil Environm & Min Engn, 35 Stirling Highway, Crawley, WA 6009, Australia;

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  • 正文语种 eng
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  • 关键词

    Independent principle; Oscillatory flow; Hydrodynamic forces; Yawed cylinders;

    机译：独立原理;振荡流量;水动力;偏航油缸;

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