Investigation and optimization of an untypical vertical axis rotor of a small wind turbine
Abstract
In this project, an atypical resistance rotor of a vertical axis rotor as a small wind energy turbine is to be aerodynamically investigated and optimised in a flow simulation. In this report the results obtained from the flow simulations of the single and two rotor setup, as well as the results from the flow simulations of a single blade, are presented. The geometry of the rotor and blades is the base geometry for further optimisation. All simulations are performed with one specific tip speed ratio. The base geometry for slat and baffle can be calculated based on experience gained in previous studies. It was found in previous experiments that a rotor with 42% overlap (area that occupies the wings of the total circumference) is always started. Those experiments have also shown that a rotor with 36.5 % overlap has a higher power coefficient at low wind speeds, at higher wind speeds, the rotor with 42 % overlap has a better power coefficient. Based on those first investigations the optimisation of the blade and rotor geometry will be carried out later in this project.
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Author Biographies
Frank Kortenstedde received his Dipl.- Ing. degree in Mechanical engineering specializing in aerospace engineering from University of Applied Sciences Bremen in 1998. He received furthermore his M.Sc. degree in Industrial Engineering in 2007 from Beuth University of Applied Sciences Berlin and his Dr.-Ing. degree from the Clausthal University of Technology in 2016. Since 2008 he has been a researcher in the Institute of Aerospace Technology at the University of Applied Sciences Bremen, where currently he works as a Research assistant and head of Department wind turbines. His scientific interests focus on aerodynamic problems concerning optimization and efficiency increase of rotor blades. He has participated in 2 national research projects, presenting results of his work at 2 international and 2 national conferences, published more than 10 scientific papers in international and national journals, book chapters, as well as conference proceedings. He is also the author of 2 national patents.
Jan M. Stief received his B. Eng. degree in aerospace engineering from University of Applied Sciences Bremen in 2017. Currently he is studying Aerospace Technologies at University of Applied Sciences Bremen to receive his M.Sc. degree. Before he started studying he completed an apprenticeship as an air- craft mechanic in 2011. Together with Mr. Kortenstedde he is working on the VAWT project. Currently he is working on his master thesis, also in the area of wind energy.
Copyright (c) 2019 Frank Kortenstedde, Jan Mathias Stief
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