Abstract
The thesis presents a numerical study of the power and noise dissipation of 5 kW-rotor vertical axis wind turbine (VAWT) for residential use, making use of ANSYS-FLUENT. The fixed and variable blade angle of attack (AoA) is investigated for two National Advisory Committee for Aeronautics (NASA) configuration designs: NACA SG6042 and SG6043. The research focused on the dissipation of noise and the output power of fixed and variable angles of attack in residential areas. The Ffowcs Williams-Hawkings (FHWH) techniques were applied to validate the output noise and vortex shedding of the different angles of attacks.
The results of the effects of a fixed and variable blade pitch angle at Low-Mach unstable incompressible Navier-Stokes flow approach on the sound pressure level at two observation places of an H-rotor vertical axis wind turbine would be evaluated by making use of the blade pitch adjustment that maximises the power out over the same sweep area. Various attack angle output noise and vortex shedding were verified using Ffowcs Williams-Hawkings (FHWH) techniques (AoA). The hypothesis of the study contends that the aeroacoustics, blade vortex interaction noise, flow separations, and dynamic stall experiences from various attacking angles are found to produce less noise and vortex shedding when comparing the calculated sound pressure levels at the positions of two observers. The study postulated that the blade from SG6043 aerofoil with a chord length of C = 0,5m yields the best energy capture in the presence of varied angle of attack (AOA). The observation is that noise level distribution is reduced on a varied AOA of the blades.
Keywords: aeroacoustics, angle of attack, Ffowcs Williams-Hawkings, sound pressure level.