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,…
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…
Author: Daniel ArayaPublication: California Institute of TechnologyYear Published: 2016 Within a wind farm, multiple turbine wakes can interact and have a substantial effect on the overall power production. This makes an understanding of the wake recovery process critically important to optimizing wind farm efficiency. Vertical-axis wind turbines (VAWTs) exhibit features that are amenable to dramatically…
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…
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…
Author: John DabiriPublication: California Institute of Technology This document is a slideshow put together by Dr. Dabiri that summarizes his work on small vertical axis wind turbines and their impacts on “planform kinetic flux”, energy density in wind farms and related issues. This is an excellent resources with plenty of figures and graphics that reviews…
Author: Horia Dumitrescu, Vladimir CardosPublication: ResearchGateYear Published: 2014 The fatigue analysis of a wind turbine component typically uses representative samples of cyclic loads to determine lifetime loads. In this paper, several techniques currently in use are compared to one another based on fatigue life analyses. The generalized Weibull fitting technique is used to remove the…
Author: Daniel Araya, John DabiriPublication: Springer-Verlag Berlin HeidelbergYear Published: 2015 We present experimental data to compare and contrast the wake characteristics of a turbine whose rotation is either driven by the oncoming flow or prescribed by a motor. Velocity measurements are collected using two-dimensional particle image velocimetry in the nearwake region of a lift-based, vertical-axis…
Author: Marius ParashivoiuPublication: Concordia UniversityYear Published: 2019 As consultant for Iopara Inc., I collaborated with WHI on their prior project, Modeling Blade Pitch and Solidities in Straight Bladed VAWTs, funded through the CEC’s Energy Innovations Small Grant Program. For that research project, Iopara created an aerodynamic model of WHI’s vertical axis wind turbine using data…
Author: A Vergaerde, Tim de Troyer, Joanna Kluczewska-Bordier, Nicolas Parneix, Frederic Silvert and MC RunacresPublication: J. Physics: Conference SeriesYear Published: 2018 Vertical-axis wind turbines (VAWTs) have received a renewed interest in the wind energy research community, mainly for off-shore applications. One advantage is that installing a pair of counter rotating VAWTs on the same floating…