Harvesting Energy by Flow Included Motions

摘要: Marine hydrokinetic (MHK ) energy is clean, renewable, and available worldwide. It comes in two forms: vertical waves horizontal currents, tides, rivers. Apart from a few major ocean most of the currents have flow speeds less than 3 kn rivers 2 kn, making harvesting their MHK by steady-lift technologies (turbines) challenging. Horizontal can also be harnessed using alternating-lift (ALT s). Fish utilize alternating lift to propel efficiently water either as individuals or schools. Engineered structures – bluff bodies, such circular cylinders prisms, slender bodies like hydrofoils may generate quasi-steady uniform flows. When these scale-relevant flexibility, severe flow–structure interaction (FSI phenomena induced. In typical engineering applications, FSI are destructive and, thus, avoided design suppressed excessive damping appendages. If instead enhanced, they result vigorous flow-induced motion (FIM body, leading conversion potential kinetic mechanical oscillator. Hydrofoils harvest through flutter well-studied understood form instability. On other hand, rectangular cross-section cylinders, exhibit several forms FIM, individually schools that been studied extensively but still not well for suppression enhancement. Those FIMs vortex-induced vibration (VIV ), galloping, buffeting, gap multibody interactions. convert with high-power density (power-to-weight ratio) even low-speed This chapter presents an overview concepts ALTs, underlying physical principles, experimental computational methods studying relevant research challenges overcome those lying ahead, field-deployment progress, technology development, bench marking.