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Lookup NU author(s): Dr Ali Bakhshandehrostami
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This research investigates application of autorotation of hinged plate to extract hydrokinetic energy from the current. Fluttering and autorotation phenomena are investigated theoretically and experimentally and, also by simulation. First contribution of this study is a new nonlinear mathematical model that proposed for fluttering and autorotation mode of the hinged plate into the current how the dynamics of the plate is estimated with high accuracy. By stability analysis on this model, a plate with hinged axis demonstrates a transcritical bifurcation. As a result, a diagram for thresholds is presented as function of dimensionless moment of inertia and dimensionless damping. Proposing a hydrokinetic turbine is second contribution of this study. This turbine, which is called VAACT (Vertical Axis Autorotation Current Turbine), utilizes autorotation of the plate for extraction energy from the current. Based on the results of experiments, autorotation of the plate happens when sufficient mass moment of inertia is provided, what is done in the VAACT. This research analyses two types of VAACT: one type has a flat plate and the other has S shape. The flat plate type reaches to 7 percent for efficiency in the water, while the S shape type gives an efficacy of 33 percent. This is comparable among the conventional turbines with mechanisms that are more complicated.
Author(s): Rostami AB
Series Editor(s): Antonio Carlos Fernandes
Publication type: Authored Book
Publication status: Unpublished
Number of Pages: 135
Publisher: COPPE, Universidade Federal do Rio de Janeiro
Place Published: Rio de Janeiro
Notes: December 2015