基于孔板的圆柱绕流减阻降载研究  

Research on Reduction of Drag and Load in Flow Around Cylinder Based on Orifice Plate

作　　者：郝文星 洪德转 陈宇聪 HAO Wenxing;HONG Dezhuan;CHEN Yucong(School of Mechanical and Electrical Engineering,Shaoxing University,Shaoxing,Zhejiang 312000)

机构地区：[1]绍兴文理学院机械与电气工程学院,浙江绍兴312000

出　　处：《绍兴文理学院学报》2024年第8期113-120,共8页Journal of Shaoxing University

基　　金：浙江省自然科学基金项目“新型自适应变桨垂直轴风力机提效降载特性与规律研究”(LQ23E060001);绍兴市基础公益计划项目“新型自适应变桨垂直轴风力机提效降载特性与规律研究”(2022A13002)。

摘　　要：流体绕过海洋立管后,会在其下游产生交替脱落的漩涡。因此海洋立管将周期性地承受平行来流方向的阻力和垂直来流方向的升力。这种疲劳载荷会对海洋立管及其支撑系统造成结构损伤或增大结构成本。本文在海洋立管表面附加基于孔板的结构物,以减缓漩涡脱落及其导致的疲劳载荷。使用基于SST k-ω湍流模型的计算流体力学方法对基于孔板的表面附加结构物的圆柱绕流进行数值模拟。通过分析一系列阻力系数、升力系数、流场压强分布和涡量分布,研究在雷诺数为2×10^(4)时,基于孔板的表面附加结构物对圆柱绕流特性的影响。结果发现这种基于孔板的表面附加结构物,能够明显减小漩涡脱落对海洋立管产生的作用,从而减小阻力、减弱升力波动,显著起到对海洋立管减阻降载的效果。When fluid flows a marine riser,alternating shedding eddies will be created in the downstream.Therefore,the marine riser will periodically bear a drag force in the direction same with the incoming flow and a lift force in the direction vertical to the incoming flow.Such fatigue loads can cause structural damage or increase structural cost to the marine riser and its support systems.The present study proposes to attach orifice-based structures to the surface of marine riser to mitigate the vortex shedding and its resulting fatigue loads.Therefore,numerical simulation on flow around a cylinder attached with an orifice plate was conducted based on the SST k-ωturbulence model.By analyzing of the drag coefficients,lift coefficients,pressure distributions and vorticity distributions,the flow characteristics around the cylinder with an orifice plate were studied at Re=2×10^(4).It was found that the surface attached structure based on the orifice plate can significantly reduce the effect of vortex shedding on the marine riser,thereby reducing the drag and lift fluctuations,and significantly reducing the drag and load of the marine riser.

关 键 词：圆柱绕流 减阻降载 孔板 数值模拟 

分 类 号：TB83[一般工业技术—摄影技术]