The depletion of petroleum oil, which is the primary source of energy, as well as the expanding awareness of the issues of climate change, have lead to growing levels of interest in sustainable energy utility. Several governments now introduce feed-in tariffs, pay house owners for generating their own electrical power, and present the financial support to build the small scale power generation unit. All of that pays extra attention to the small scale or domestic wind turbines in the last decade. Vertical axis wind turbines (VAWTs) show the ability to accept wind from random directions, have compact design, including the possibility of housing mechanical and electrical components at ground level. Thus, VAWTs have been proposed as an adequate solution for deployment in urban areas, where the wind is gusty. As the VAWTs are erected in the urban areas, they will get considerably close to people; therefore, the annoyance level is essential for public acceptance, and the build-up of a low-noise rotor becomes crucial. Therefore, the aim of this study was to investigate the noise generated from the H-rotor VAWT for a range of operating conditions and design parameters, to investigate the behavior of VAWTs under the turbulent flow conditions with different turbulence length scales, and to investigate new configurations to enhance the turbine performance.weiterlesen