Author: Dan Henningson, Martin BerggrenPublication: KTHYear Published: 2005 These lecture notes has evolved from a CFD course (5C1212) and a Fluid Mechanics course (5C1214) at the department of Mechanics and the department of Numerical Analysis and Computer Science (NADA) at KTH. Erik Stalberg and Ori Levin has typed most of the LATEX formulas and has…
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…
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…
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…
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…
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…
Author: John DabiriPublication: Physics TodayYear Published: 2014 The defining element of modern wind farms is the propeller like structure known as a horizontal-axis wind turbine. A marvel of engineering, the HAWT typically comprises more than 8000 parts, and its blades reach more than 200 m above the ground.
Author: A. Leneville, P. VittecoqPublication: Sol Energ. Eng.Year Published: 1986 This paper presents the results of an experimental investigation on a driven Darrieus turbine rotating at different tip speed ratios. For a Reynolds number of 3.8 × 104 , the results indicate the presence of dynamic stall at tip speed ratio less than 4, and…
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…