Impact of Aspect Ratio on Drag and Flow Structure for Cylinders With Two Free Ends

IF 1.8 3区工程技术 Q3 ENGINEERING, MECHANICAL Journal of Fluids Engineering-Transactions of the Asme Pub Date : 2023-06-06 DOI:10.1115/1.4062575

Thomas Shepard, Deify Law, Jacob Dahl, Rhett Reichstadt, Arun Sriniwas Selvamani

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Abstract

Abstract When examining the literature for flow effects on circular cylinders one can find many studies on infinite cylinders and cantilevered cylinders but minimal data related to cylinders with two free ends (Shepard, T., Law, D., Dahl, J., Reichstadt, R., and Selvamani, A. S., 2022, “Impact of Aspect Ratio on Drag and Flow Structure for Cylinders With Two Free Ends,” ASME Paper No. V001T03A031.). The limited data available shows that the cylinder aspect ratio affects the drag and frequency content of flow within the wake however these studies were done at discreet Reynolds numbers. In order to better understand the combined impact of aspect ratio and Reynolds number a series of wind tunnel tests and numerical simulations has been conducted for cylinders with two free ends having aspect ratios of 2–15. Tests were carried out in the subcritical regime with Reynolds numbers ranging 13000–105,000. Tip vortex effects, which vary with aspect ratio, are shown to impact the cylinder surface pressure, drag coefficient, and wake Strouhal numbers though Reynolds number effects are minor for the conditions studied. The results are compared against existing historical data and show the trend of drag coefficient increasing with cylinder aspect ratio (Shepard, T., Law, D., Dahl, J., Reichstadt, R., and Selvamani, A. S., 2022, “Impact of Aspect Ratio on Drag and Flow Structure for Cylinders With Two Free Ends,” ASME Paper No. V001T03A031).

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宽高比对两端自由气缸阻力流动结构的影响

当检查关于圆柱流动影响的文献时，人们可以发现许多关于无限圆柱体和悬臂圆柱体的研究，但与两个自由端圆柱体相关的数据很少(Shepard, T.， Law, D.， Dahl, J.， Reichstadt, R.和Selvamani, A. S.， 2022，“长径比对两个自由端圆柱体阻力和流动结构的影响”，ASME论文号:V001T03A031)。有限的可用数据表明，圆柱展弦比影响尾迹内流动的阻力和频率含量，但这些研究是在离散雷诺数下进行的。为了更好地了解展弦比和雷诺数的综合影响，对两个自由端展弦比为2-15的圆柱体进行了一系列风洞试验和数值模拟。试验在亚临界状态下进行，雷诺数范围为13000 - 105000。叶尖涡效应随展弦比的变化而变化，虽然在研究条件下雷诺数效应较小，但叶尖涡效应对气缸表面压力、阻力系数和尾流斯特罗哈尔数有影响。结果与现有的历史数据进行了比较，显示了阻力系数随气缸长径比增加的趋势(Shepard, T.， Law, D.， Dahl, J.， Reichstadt, R.， and Selvamani, A. S.， 2022，“长径比对两个自由端气缸阻力和流动结构的影响”，ASME论文编号:V001T03A031)。

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来源期刊

Journal of Fluids Engineering-Transactions of the Asme 工程技术-工程：机械

CiteScore

4.60

自引率

10.00%

发文量

165

审稿时长

5.0 months

期刊介绍： Multiphase flows; Pumps; Aerodynamics; Boundary layers; Bubbly flows; Cavitation; Compressible flows; Convective heat/mass transfer as it is affected by fluid flow; Duct and pipe flows; Free shear layers; Flows in biological systems; Fluid-structure interaction; Fluid transients and wave motion; Jets; Naval hydrodynamics; Sprays; Stability and transition; Turbulence wakes microfluidics and other fundamental/applied fluid mechanical phenomena and processes