Abstract
AbstractIn 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.KeywordsVertical axis wind turbineVariable pitch bladeDouble-multiple stream tube modelComputational fluid dynamicsSelf startingPower coefficient
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