Suppression of wake-induced vibration of tandem cylinders with free-to-rotate control plates |
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| Authors: | GRS Assi PW Bearman N Kitney MA Tognarelli |
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| Institution: | 1. Department of Aeronautics, Imperial College, London, UK;2. BP Exploration Operating Company Ltd., Sunbury-on-Thames, UK;3. BP America Production Company, Houston, USA;1. Department of Mathematics, Lehigh University, Bethlehem, PA 18015, USA;2. Division of Applied Mathematics, Brown University, Providence, RI 02912, USA;3. Department of Mechanical Engineering, MIT, Cambridge, MA 02139, USA;4. Chevron Energy Technology Company, Houston, TX 77002, USA;5. Consultant, USA;1. Department of Mechanical Engineering, Poli, University of São Paulo, Av. Prof. Melo Morais, 2231, Cidade Universitária, São Paulo 05508-030, SP, Brazil;2. Department of Naval Engineering, Poli, University of São Paulo, Brazil;1. Dept. of Naval Arch. & Ocean Eng., University of São Paulo, São Paulo, Brazil;2. Department of Aeronautics, Imperial College, London, UK |
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| Abstract: | Experiments have been carried out on a pair of circular cylinders to investigate the effectiveness of pivoting parallel plates as wake-induced vibration suppressors. Measurements of amplitude of vibration and average drag are presented for a circular cylinder, free to respond in the cross-flow direction, with mass ratio 2 and a damping level of 0.7% of critical damping. Reduced velocities were up to nearly 30, with associated Reynolds numbers up to 2.3×104 and the results presented are for a centre-to-centre separation of cylinders of 4 diameters. It is shown how vortex-induced vibration and wake-induced vibration of the downstream cylinder of a tandem pair can be practically eliminated by using free to rotate parallel plates. The device achieves vibration suppression with a substantial drag reduction when compared to a pair of fixed tandem cylinders at the same Reynolds number. Results for a single splitter plate and helical strakes are also presented for comparison and were found not to be effective in suppressing wake-induced vibration. |
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