Synergistic Flow-Induced Oscillation of Multiple Cylinders in Harvesting Marine Hydrokinetic Energy

摘要: Power-to-volume density is a critical metric for all renewable energy technologies. Harnessing Marine Hydrokinetic (MHK) using single linear or nonlinear oscillator with cylinder in Flow Induced Oscillations (FIO) has proven to be an efficient and environmentally compatible method. MHK power harnessing by two rigid, circular, tandem cylinders on end-springs Reynolds number 3 × 104 ≤ Re ≤ 1.2 × 105 spacing, damping, and stiffness as parameters investigated experimentally. The objective identify optimal parameter combinations where the cylinders, close-proximity, undergo synergistic FIO more than they would individually. spring-damper controller Vck, developed Renewable Energy Laboratory (MRELab), enables embedded computer-controlled change of viscous-damping spring-stiffness fast precise realization. Experimental results amplitude response, harvesting, efficiency are presented discussed. Center-to-center spacing 1.57, 2.0, 2.57 diameters, damping ratio 0.00 < ζharness 0.24, spring 200 N/m K 1200 N/m tested. Limited three cylinders. main conclusions are: (1) For tested parameters, harness 2.56–7.5 times cylinder; corresponding 2.0–6.68. (2) harnessed upstream increased up 100%, affected downstream cylinder. (3) its benefit less interaction becomes smaller. (4) increases nearly orders magnitude.