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IEEE Joint CS/RA/SMC Chapter Technical Meeting “Dynamic Modeling of Vortex Induced Vibration Wind Turbines”
June 13, 2018 @ 11:00 am - 12:00 pm
Title: Dynamic Modeling of Vortex Induced Vibration Wind Turbines
Abstract: Bladeless Wind Turbines (BWT) present a new idea in energy generation. These bladeless turbines work to achieve essentially the same thing as traditional turbines: To turn the wind into kinetic energy that can be harvested to generate electricity. However, instead of a propeller, these structures use a pattern of vortices (spinning wind) in order to capture the breeze. In this presentation we talk about dynamic modeling of four configurations of vortex-induced vibrations of bladeless wind turbines. The BWTs consist of a bluff body mounted on a flexible structure in the flow field. The shape of the bluff body and its mounting structure are different among the proposed BWTs. The Euler-Bernoulli beam theory and the Galerkin procedure are used to derive a nonlinear distributed-parameter model for the BWTs under a fluctuating lift force due to periodically shedding vortices. The derived dynamic model is validated through comparison with a 3D CFD-FEM numerical simulation. The effects of the wind speed on the induced lift force, turbine deflection, and generated power of four BWTs are investigated. It is verified that the amplitude of the vibrations of the BWT increases significantly when the vortex shedding is synchronized with the structural oscillations. The results show that, while conic BWTs have a higher performance at post-synchronization region (i.e. high wind speeds), the circular cylinder BWTs exhibit a better performance at pre-synchronization region (i.e. low wind speeds).
Speaker(s): Professor Mohammad Eghtesad,
The University of British Columbia
2356 Main Mall
Vancouver, British Columbia