Hochauflösende Parameterstudie von Blattspitzenwirbeln eines Rotors im Schwebeflug / High-Resolution Parameter Study of Blade Tip Vortices of a Rotor in Hover

Abstract

A helicopter’s wake is strongly influenced by rotor blade tip vortices, which govern the wake’s shape and dynamics and contribute to negative effects such as blade vortex interaction, noise, and energy loss. Improving models of blade tip vortices is crucial for more accurate predictions of the flow field around rotorcrafts and for mitigating these adverse effects. This study aims to refine a vortex model using a statistical analysis of vortex characteristics obtained from two-dimensional (2D), 3-component (3C) Particle Image Velocimetry (PIV ) data obtained from a single-blade rotor out-of-ground. By examining the statistical distribution and dynamics of vortex features, I propose enhancements to the Lamb-Oseen model to better represent real-world vortex behavior. The results indicate that these modifications lead to more precise wake predictions, which can improve the design of rotorcraft systems and reduce noise and energy loss. These findings con tribute to advancing vortex modeling and offer a foundation for future work in rotorcraft aerodynamics and noise mitigation.