روش‌شناسی آزمایشگاهی و راهکارهای کاهش نویز در توربین‌های بادی محور عمودی با کاربرد شهری

In recent years, the increasing implementation of vertical axis wind turbines (VAWTs) in urban areas has intensified research interest in their acoustic behavior. The distinctive geometric and aerodynamic characteristics of these turbines result in complex and diverse noise generation patterns. This study presents a comprehensive analysis of the aeroacoustic behavior of VAWTs, focusing on identifying the dominant sound generation mechanisms and assessing the effects of key operational parameters, including the tip speed ratio, Reynolds number, and blade geometric features. Experimental data obtained from both anechoic and semi-anechoic wind tunnel tests were reviewed and synthesized to provide an integrated understanding of the noise sources and spectral characteristics associated with these turbines. The results reveal that the acoustic performance of VAWTs is strongly influenced by blade geometry, boundary-layer conditions, and the synchronization strategy between rotor rotation and acoustic measurements. Furthermore, artificial boundary-layer tripping using roughness strips effectively reduces tonal noise and enhances the flow stability around the turbine. The outcomes of this research offer valuable insights for the design of low-noise VAWTs suitable for urban applications and noise-restricted environments, contributing to the broader goal of sustainable wind energy development.