FEEDBACK CONTROL OF VORTEX SHEDDING FROM A CIRCULAR CYLINDER BY ROTATIONAL OSCILLATIONS |
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| Institution: | 1. Department of Mechanical and Production Engineering, Niigata University, 8050 Ikarashi 2, Niigata, 950-2181, Japan;2. Department of Mechanical System Engineering, Gunma University, Kiryu, 376, Japan;1. Department of Mechanical Engineering, Kangwon National University, Samcheok, Republic of Korea;2. Institute for Turbulence-Noise-Vibration Interaction and Control, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China;3. Key Lab of Advanced Manufacturing Technology, School of Mechanical Engineering and Automation, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China;1. Key Laboratory of Low-grade Energy Utilization Technologies and Systems of Ministry of Education of China, College of Power Engineering, Chongqing University, Chongqing, China;2. Marine Renewable Energy Laboratory, Dept. of Naval Architecture & Marine Engineering, University of Michigan, Ann Arbor, MI, USA;3. Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI, USA;4. Vortex Hydro Energy, Ann Arbor, MI, USA;5. College of Resources and Environmental Science, Chongqing University, Chongqing, China;1. College of Aerospace and Civil Engineering, Harbin Engineering University, China;2. Marine Renewable Energy Laboratory, Dept. of Naval Architecture & Marine Engineering, University of Michigan, 2600 Draper Road, Ann Arbor, MI, 48109-2145, USA;3. Intern, Northville High School, Northville, MI, USA;4. Naval Architecture and Marine Engineering, Scientific Computing, USA |
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| Abstract: | The present paper describes a new active method for controlling vortex shedding from a circular cylinder in a uniform flow at medium Reynolds numbers. It uses rotary cylinder oscillations controlled by the feedback signal of a reference velocity in the cylinder wake. The effectiveness of this feedback control is evaluated by measuring the response of mean and fluctuating velocities in the cylinder wake, the spanwise correlation, the power spectrum, and the fluid forces acting on the cylinder. It is found that the velocity fluctuations and the fluid forces are both reduced by the feedback control with optimum values of the phase lag and feedback gain. The simultaneous flow visualization synchronized with the cylinder oscillation indicates the attenuation as well as the mechanisms of vortex shedding under the feedback control, which is due to the dynamic effect of cylinder oscillation on the vortex formation. |
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