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http://dx.doi.org/10.12989/ose.2021.11.2.141

Fish-ridge wind turbine aerodynamics characteristics in Oscillating Water Column (OWC) system  

Hiron, Nurul (Department of Electrical Engineering, University of Siliwangi)
Giriantari, Ida A.D. (Department of Electrical Engineering, University of Udayana)
Jasa, Lie (Department of Electrical Engineering, University of Udayana)
Kumara, I. Nyoman S. (Department of Electrical Engineering, University of Udayana)
Publication Information
Ocean Systems Engineering / v.11, no.2, 2021 , pp. 141-159 More about this Journal
Abstract
This paper analyzes the fish-ridge type wind turbine performance and characteristics of energy extraction applied in a low wave Oscillating Water Column (OWC) system. This article contributes to providing a better understanding of the application of OWC and VAWT in a low wave environment. The aerodynamic characteristics of the three-blade fish-ridge turbine in an OWC chamber have been successfully investigated. CFD simulation with Reynolds-Averaged-Stokes (RANS) equations was used to obtain airspeed and air pressure contours under compressed and decompressed conditions in the turbine blades. Experiments on laboratory scale test rig also obtained data. The blade torque and turbine power coefficient at different AoA were validated through the experimental test to obtain numerical equations for the relationship between airspeeds, torque, tip speed ratio, and turbine power. The turbine design was 0.2 m long and 0.1 m wide and with an overlap ratio of 15%. The maximum tested airspeed was 20m/s. We found that the fish-ridge turbine has a homogeneous air velocity distribution and pressure due to the 15% overlap area. The maximum efficiency of the fish-ridge turbine under compressed conditions was 30% at TSR 0.9, while under decompressed conditions, the maximum efficiency reached 28% at TSR 0.6.
Keywords
wind energy; wind turbine; oscillating water column; CFD; dynamic wind effects; pressure distribution; RANS equations; Navier-Stokes equations;
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