Nonlinear piecewise restoring force in hydrokinetic power conversion using flow induced motions of single cylinder
作者： Chunhui Ma , Hai Sun , Gary Nowakowski , Erik Mauer , Michael M. Bernitsas
DOI: 10.1016/J.OCEANENG.2016.10.020
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摘要: Abstract Flow Induced Motions (FIMs) of a single, rigid, circular cylinder with piecewise continuous restoring force are investigated for Reynolds number 24,000≤Re≤120,000 damping, and different functions as parameters. Selective roughness is applied to enhance FIM increase the hydrokinetic energy captured by VIVACE (Vortex Vibration Aquatic Clean Energy) Converter at higher numbers. The second generation virtual spring-damping system Vck, developed in Marine Renewable Energy Laboratory (MRELab), enables embedded computer-controlled change viscous-damping spring-stiffness fast precise oscillator modeling. Experimental results amplitude response, frequency harvesting, efficiency presented discussed. All experiments were conducted Low Turbulence Free Surface Water (LTFSW) Channel MRELab University Michigan. main conclusions are: (1) nonlinear spring can harness from flows slow 0.275 m/s no upper limit. (2) In galloping, has up 76% better performance than its linear counterpart. (3) response predominantly periodic all used. (4) Optimal power harnessing achieved changing function viscous damping. (5) exhibits local maxima conversion end branch VIV highest velocity reached galloping. (6) optima though beginning initial
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