Features of the flow over a rotating circular cylinder at different spin ratios and Reynolds numbers: Experimental and numerical study

Yazdi, Mohammad Javad Ezadi; Rad, Ali Safavi; Khoshnevis, Abdolamir Bak

doi:10.1140/epjp/i2019-12508-3

Cited by 12 publications

(4 citation statements)

References 48 publications

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“…In the study [6], the authors experimentally and numerically investigated the flow characteristics around a rotating circular cylinder, the diameter of which is 20 mm. Parameters such as the time-averaged velocity, turbulence intensity, drag coefficient and flow structure at the Reynolds number 5900≤Re≤11800 and the rotation coefficient 0≤α≤0.525 were investigated.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of aerodynamic coefficients of a combined blade

Tanasheva,

Bakhtybekova,

Shuyushbayeva

et al. 2024

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Magnus wind turbines have a number of advantages in the form of electricity generation at low wind values, ranging from 3-4 m/s. However, at high speeds around the existing blades of wind turbines, there is a phenomenon of separation of vortices, which entails the destruction of the structure, as well as an increase in drag. Based on this, an urgent issue is the regulation of the flow around cylindrical bodies, along with a decrease in drag force. The novelty of the work is the elimination of vortices, as well as their control, by adding a fixed blade to the cylinder. Authors of the article for this purpose created a mock-up of the cylinder blade with a fixed blade. A number of experimental studies were carried out to determine the aerodynamic forces and coefficients depending on the angle of inclination with respect to the incoming flow at U = 5 m/s. It was found that at an angle of inclination of 0° and 180°, the combined blade has a maximum lifting force of 2.7 N and 2.75 N, respectively. It is determined that at these angles, the drag force is the lowest and is 1.26 N and 1.08 N.

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Section: Introductionmentioning

confidence: 99%

Experimental study of aerodynamic coefficients of a combined blade

Tanasheva,

Bakhtybekova,

Shuyushbayeva

et al. 2024

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“…Furthermore, hydrodynamic studies under different rotation rates and Reynolds numbers have been conducted. Ray et al [11,12] conducted numerical and experimental analysis of the bypass flow of a rotating cylinder, at Reynolds numbers from 5000-11800. They summarised the variation of lift and drag coefficients and analysed the flow field characteristics behind the rotating cylinder.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Vibration of a Rotating Pipe in Still Water and in Flow

Geng

Liu

et al. 2023

Polish Maritime Research

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To illustrate the vibration characteristics of a rotating pipe in flow, experiments were conducted for a pipe in flow, a rotating pipe in still water and a rotating pipe in flow. For the pipe in flow without rotation, the trajectory diagram is ‘8’ shaped. For the rotating pipe in still water, a multiple frequency component was induced, and a ‘positive direction whirl’ was found. For the flow and rotation, at a flow velocity of 0.46 m/s, the vibration is dominated by the combination of flow and rotation. With an increase in rotating frequency, the trajectory of the rotating pipe varies from an ‘8’ shape to a circular shape and the ‘reverse direction whirl’ is induced, which is different from ‘positive direction’ in still water. The vibration frequency ratio increases uniformly with flow velocity. At a flow velocity of 1.02 m/s, at which the frequency is close to the theoretical natural frequency, the vibration frequency ratio is f*≈1. Predominantly governed by vortex-induced vibration (VIV), the vibration behavior of a rotating pipe subjected to fluid flow conditions has been found to exhibit complete vanishing of whirl. The vibration characteristics of a rotating pipe in flow are studied by the experiments which is benefit for structural drilling design.

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“…In 2019, Yazdi et al [18] investigated flow characteristics within a rotating cylinder using experimental and numerical methods. As the rotational speed ratio increased, the symmetry of the flow broke.…”

Section: Introductionmentioning

confidence: 99%

The Aerodynamic Characteristics of a Rotating Cylinder Based on Large-Eddy Simulations

Zhao

Zhi‐Jian

et al. 2023

JMSE

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The cylindrical flow around a cylinder is present in several engineering problems. Moreover, the flow pattern around a rotating cylinder is more complex than that around a cylinder. In this paper, a rotating cylinder at different speed ratios is investigated by means of large-eddy simulations. In particular, the lift coefficient CL, drag coefficient CD, lift-to-drag ratio k, Strouhal number St, the flow field in each section, and the three-dimensional eddy structure are compared at different speed ratios. In addition, the effects of an end disk on the aerodynamic loads and flow field of the rotating cylinder were investigated. The results showed that, in the absence of an end disk, CL increased, CD increased and then decreased, k increased and then decreased, and St increased and then decreased as the speed ratio increased. The turnaround occurs for each parameter at a speed ratio of n = 2, and vortex shedding is suppressed at this speed ratio. Notably, the tip vortex at the free end was not suppressed. The CL, CD, and k values of the cylinder when adding the end disk were greater than those of the normal cylinder. For example, when the speed ratio is 3, the lift coefficient is increased by 27%, the drag coefficient is increased by 24%, and the lift-to-drag ratio is increased by 23% after adding the end plate. In addition, the vortex structure at the free end differed substantially. This study provides a systematic method to evaluate the aerodynamic loads and flow field changes around a cylinder, laying the foundation for solving the problems of cylinder flow and rotating cylinder flow.

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Features of the flow over a rotating circular cylinder at different spin ratios and Reynolds numbers: Experimental and numerical study

Cited by 12 publications

References 48 publications

Experimental study of aerodynamic coefficients of a combined blade

Experimental study of aerodynamic coefficients of a combined blade

Experimental Study on Vibration of a Rotating Pipe in Still Water and in Flow

The Aerodynamic Characteristics of a Rotating Cylinder Based on Large-Eddy Simulations

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