Influences of yaw angle and turbulence intensity on the performance of a 20&nbsp;kW in-stream hydrokinetic turbine

Tian, Wenlong; VanZwieten, James H.; Pyakurel, Parakram; Li, Yanjun

doi:10.1016/j.energy.2016.05.012

Influences of yaw angle and turbulence intensity on the performance of a 20 kW in-stream hydrokinetic turbine

Journal Article · Fri Jun 03 00:00:00 EDT 2016 · Energy

DOI:https://doi.org/10.1016/j.energy.2016.05.012· OSTI ID:1986600

Tian, Wenlong ^[1]; VanZwieten, James H. ^[2]; Pyakurel, Parakram ^[2]; Li, Yanjun ^[2]

Northwestern Polytechnical Univ., Xi'an, Shaanxi (China); Florida Atlantic Univ., Boca Raton, FL (United States); Florida Atlantic University
Florida Atlantic Univ., Boca Raton, FL (United States)

Herein three-dimensional transient CFD (Computational Fluid Dynamics) simulations are performed to study the hydrodynamic performance of an ocean current turbine with a 3.0 m diameter 3-bladed rotor. Simulations are based on the RANS (Reynolds Averaged Navier–Stokes) equations and the shear stress transport k-ω turbulent model is utilized. The influence of yaw angle and upstream TI (turbulence intensity) on the turbine performance is studied. The CFD method is first validated using existing experimental data and good agreement is obtained. The performance of the turbine, including power, thrust and wake characteristics are then studied at different TSR (tip speed ratios). The turbine obtains a maximum coefficient of power (C_p) of 0.4642 at TSR = 6 and the coefficient of thrust (C_t) increases over the entire evaluated TSR range to a value of 0.8788 at a TSR = 10. Simulations are also performed at four different yaw angles, 0°, 5°, 10° and 15° which show that both C_p and C_t decrease as yaw angle increases. Finally simulations of three different TIs, 3%, 6% and 9%, are performed and analyzed. Results show that TI minimally affects C_p and C_t for the considered TI range, but greatly influences the downstream wake structure.

Research Organization:: Florida Atlantic Univ., Boca Raton, FL (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Water Power Technologies Office

Grant/Contract Number:: EE0004200

OSTI ID:: 1986600

Journal Information:: Energy, Journal Name: Energy Vol. 111; ISSN 0360-5442

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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13 HYDRO ENERGY
computational fluid dynamics (CFD)
hydrokinetic turbine
turbine
turbulence intensity
yaw

Influences of yaw angle and turbulence intensity on the performance of a 20 kW in-stream hydrokinetic turbine

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References (13)

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