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• W4283221323 abstract "This paper describes an experimental investigation of the aerodynamic forces and wake flowfield created by spinning cylinders in crossflow. Three large scale geometric roughness configurations on the cylinder surface are studied, namely, 1) spanwise ribs, 2) streamwise ribs, and 3) diamond protuberances. The flowfield properties of these four cylinders are investigated at three cylinder rotational velocities, and three wind tunnel speeds. The aerodynamic forces acting on the cylinder are measured using a six degree-of-freedom force-torque sensor. Unsteady velocity data is obtained by traversing a fast-response multi-hole pressure probe along a uniform grid downstream of the cylinder. The spanwise ribbed cylinder produces a significant improvement of the aerodynamic forces. Analysis of the flowfield data shows that, for a fixed velocity ratio, this roughness configuration intensifies the flow circulation close to the cylinder surface, enhancing the Magnus effect. Compared to all other geometries studied, the cylinder with spanwise ribs is observed to 1) deflect the mean wake flow more strongly, 2) present lower levels of normal and shear stresses at least from one diameter downstream of the cylinder axis up to five cylinder diameters, and 3) increases the frequency associated with vortex shedding. The aerodynamic efficiency and the shedding frequency are the only phenomena seen to be strongly dependent on Reynolds number. This dependency decreases as the velocity ratio increases. Although some specific flowfield results for the streamwise ribs and diamond protuberances cylinders are inconclusive, these geometries do not improve the aerodynamic coefficients of the baseline configuration. For the highest Reynolds number studied (Re�� = 60000), the data obtained for the spanwise ribbed cylinder showed consistent aerodynamic benefit within the velocity ratio range 0.2 ≤ ��r ≤ 1.5. Further experiments and numerical studies will be carried out to investigate the performance of this model at higher Reynolds numbers." @default.
• W4283221323 created "2022-06-22" @default.
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• W4283221323 date "2022-06-20" @default.
• W4283221323 modified "2023-10-18" @default.
• W4283221323 title "Roughness effects on the aerodynamic forces and wake flowfield of spinning cylinders" @default.
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• W4283221323 doi "https://doi.org/10.2514/6.2022-4021" @default.
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