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…

Exploring the benefits of vertically staggered wind farms: Understanding the power generation mechanisms of turbines operating at different scales

Synergy with Tall and Short Turbines, Turbine Wake

Author: Tanmoy Chatterjee, Yulia PeetPublication: Wind EnergyYear Published: 2018 Wind farms are known to modulate large scale structures in and around the wake regions of the turbines. The potential benefits of placing small hub height, small rotor turbines in between the large turbines in a wind farm to take advantage of such modulated large‐scale eddies…

Experimental investigation of vertical-axis wind-turbine wakes in boundary layer flow

Synergy with Tall and Short Turbines, Turbine Wake

Author: Vincent F-C. Rolin, Fernando Porté-AgelPublication: Renewable EnergyYear Published: 2018 In this experiment, a small scale vertical-axis wind-turbine (VAWT) is immersed in a boundary-layer in a wind tunnel and stereo particle image velocimetry is employed to quantify the 3D characteristics of the wake. The measurements show that the wake is strongest behind the sector of…

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…

Energy Exchange in an Array of Vertical-Axis Wind Turbines

Synergy with Tall and Short Turbines, Turbine Wake

Author: Matthias Kinzel, Quinn Mulligan and John DabiriPublication: Journal of TurbulenceYear Published: 2012 We analyze the flow field within an array of 18 counter-rotating, vertical-axis wind turbines (VAWTs), with an emphasis on the fluxes of mean and turbulence kinetic energy. The turbine wakes and the recovery of the mean wind speed between the turbine rows…

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,…

Benefits of Collocating Vertical-Axis and Horizontal-Axis Wind Turbines in Large Wind Farms

Synergy with Tall and Short Turbines, Turbine Wake

Author: Shengbail Xie, Cristina Archer, Niranjan Ghaisas and Charles MeneveauPublication: Wiley Online LibraryYear Published: 2016 In this study, we address the benefits of a vertically staggered (VS) wind farm, in which vertical-axis and horizontal-axis wind turbines are collocated in a large wind farm. The case study consists of 20 small vertical-axis turbines added around each…