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http://dx.doi.org/10.2478/IJNAOE-2013-0177

Flow-driven rotor simulation of vertical axis tidal turbines: A comparison of helical and straight blades  

Le, Tuyen Quang (Korea Institute of Ocean Science & Technology)
Lee, Kwang-Soo (Korea Institute of Ocean Science & Technology)
Park, Jin-Soon (Korea Institute of Ocean Science & Technology)
Ko, Jin Hwan (Korea Institute of Ocean Science & Technology)
Publication Information
International Journal of Naval Architecture and Ocean Engineering / v.6, no.2, 2014 , pp. 257-268 More about this Journal
Abstract
In this study, flow-driven rotor simulations with a given load are conducted to analyze the operational characteristics of a vertical-axis Darrieus turbine, specifically its self-starting capability and fluctuations in its torque as well as the RPM. These characteristics are typically observed in experiments, though they cannot be acquired in simulations with a given tip speed ratio (TSR). First, it is shown that a flow-driven rotor simulation with a two-dimensional (2D) turbine model obtains power coefficients with curves similar to those obtained in a simulation with a given TSR. 3D flow-driven rotor simulations with an optimal geometry then show that a helical-bladed turbine has the following prominent advantages over a straight-bladed turbine of the same size: an improvement of its self-starting capabilities and reduced fluctuations in its torque and RPM curves as well as an increase in its power coefficient from 33% to 42%. Therefore, it is clear that a flow-driven rotor simulation provides more information for the design of a Darrieus turbine than a simulation with a given TSR before experiments.
Keywords
Darrieus turbine; Helical-bladed; Flow-driven rotor simulation; Self-starting capability; Torque fluctuation; Tidal steam generation;
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