Noise generation remains a major concern in the design of modern rotorcrafts. One of the major noise sources is associated with the blade-vortex interaction (BVI) phenomenon. The present study concerns the investigation of tip vortex formation and development of passive flow control technique for the reduction of strength and vortex core size. Two measurement techniques: laser sheeting photography and velocity measurements utilizing a hot-wire anemometer, were conducted in a low-speed wind tunnel environment to determine vortex size. Five different blade-tip geometries were subject of investigation. The study shows that the polyhedral blade was deemed the most efficient due to the decrease in overall vortex velocity. Numerical studies using large-eddy simulation approach are in progress.