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

Miscellaneous, Synergy with Tall and Short Turbines

Author: Tuyen Quang Le, Kwang-Soo Lee, Jin-Soon Park, Jin Hwan KoPublication: Ocean Eng.Year Published: 2014 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…

Erratum: Energy Exchange in an Array of Vertical-Axis Wind Turbines

Miscellaneous, Synergy with Tall and Short Turbines

Author: Matthias Kinzel, Quinn Mulligan and John DabiriPublication: Journal of TurbulenceYear Published: 2013 The calculation of the planform kinetic energy flux in this paper contains an error. The equation stated in the manuscript, Pvert ≈ −ρAplanu < u′w′ >, is correct. However, a typographical error in the data processing code had the effect of calculating…

Dramatically increase wind farm output while protecting wildlife

Miscellaneous, Synergy with Tall and Short Turbines, Vertical Axis Wind Turbines, Wind Harvesters

Author: Kevin WolfPublication: Wind Harvest InternationalYear Published: 2018 Wind farms in California and other regions of the world exist only in relatively small geographic regions. Most of these resource areas have reached their physical or political limits in their ability to install additional propeller-type, horizontal axis wind turbines (HAWTs). Nonetheless, many have topographies that create…

Development of the Dual Vertical Axis Wind Turbine Using CFD

Miscellaneous, Synergy with Tall and Short Turbines

Author: Gabriel Naccache, Marius ParaschivoiuPublication: J. Fluids Eng.Year Published: 2017 Small vertical axis wind turbines (VAWTs) are good candidates to extract energy from wind in urban areas because they are easy to install, service, and do not generate much noise; however, the efficiency of small turbines is low. Here-in a new turbine, with high efficiency,…

Aerodynamic Simulation of Vertical-Axis Wind Turbines

Miscellaneous, Synergy with Tall and Short Turbines

Author: A. Korobenko, M.C. Hsu, I. Akkerman, Y. BazilevsPublication: J. Appl. Mech.Year Published: 2014 Full-scale, 3D, time-dependent aerodynamics modeling and simulation of a Darrieus-type vertical-axis wind turbine (VAWT) is presented. The simulations are performed using a moving-domain finite-element-based ALE-VMS technique augmented with a sliding-interface formulation to handle the rotor-stator interactions present. We simulate a single…

Aerodynamic Interference of Vertical Axis Wind Turbines

Miscellaneous, Synergy with Tall and Short Turbines

Author: R. Ganesh Rajagopalan , Ted L. Rickerl and Paul C. KlimasPublication: Sandia National LaboratoriesYear Published: 1990 The laminal flowfield and performance of clusters of two-dimensional vertical axis wind turbines are analyzed by idealizing the rotors as momentum sources. The flowfield dominated by the pressure field of the operating turbines is determined by solving the…

Fish schooling as a basis for vertical axis wind turbine farm design

Aerodynamic, Computer Modeling, Miscellaneous, Synergy with Tall and Short Turbines

Author: Robert Whittlesey, Sebastian Liska, and John DabiriPublication: California Institute of TechnologyYear Published: 2010 Most wind farms consist of horizontal axis wind turbines (HAWTs) due to the high power coefficient (mechanical power output divided by the power of the free-stream air through the turbine cross-sectional area) of an isolated turbine. However when in close proximity…