Research Article
Numerical Investigations of Variable Pitch Straight-Bladed H-Darrieus VAWT
@INPROCEEDINGS{10.1007/978-3-030-93712-6_38, author={Temesgen Abriham Miliket and Mesfin Belayneh Ageze and Muluken Temesgen Tigabu}, title={Numerical Investigations of Variable Pitch Straight-Bladed H-Darrieus VAWT}, proceedings={Advances of Science and Technology. 9th EAI International Conference, ICAST 2021, Hybrid Event, Bahir Dar, Ethiopia, August 27--29, 2021, Proceedings, Part II}, proceedings_a={ICAST PART 2}, year={2022}, month={1}, keywords={Vertical axis wind turbine Variable pitch blade Double-multiple stream tube model Computational fluid dynamics Self starting Power coefficient}, doi={10.1007/978-3-030-93712-6_38} }- Temesgen Abriham Miliket
Mesfin Belayneh Ageze
Muluken Temesgen Tigabu
Year: 2022
Numerical Investigations of Variable Pitch Straight-Bladed H-Darrieus VAWT
ICAST PART 2
Springer
DOI: 10.1007/978-3-030-93712-6_38
Abstract
In this paper, we aim to develop low cost effective model for evaluating the aerodynamic design and performance of small scale straight blade H-Darrieus vertical axis wind turbine (VAWT). To optimize the rotor design the blades are modeled with variable pitch angle (β) configurations. To this end, DMST model was used to determine optimum pitch configuration at the minimum possible tip speed ratio (λ). Once the optimal design point was obtained, 2D unsteady computational fluid dynamics (CFD) simulation was carried out in order to describe the flow physics of the rotor. The power coefficient (Cp) obtained in DMST model was 0.464 which is in agreement with the present CFD simulation result computed by SST k-ω model (i.e. Cp = 0.4537) and wind tunnel experimental findings from literatures. This implies the performance of straight blade H-Darrieus VAWT with VP design is 37.2% better than one with the fixed pitch (β = 0°) blades. Hence, the present study delineates the performance of H-Darrieus wind turbine is dependent upon the turbine parameters, airfoil profile and desired blade pitch angle for sustainable power generation.
