Aerodynamics and Acoustics of Rotor Blade-Vortex Interactions

摘要

As part of an international cooperative program, several aerodynamic and acoustic prediction codes have been recently developed to understand the rotor blade-vortex interaction (BVI) noise. Furthermore, a joint validation activity of these prediction codes was performed with the blade surface pressure and acoustic data taken in the German-Dutch Wind Tunnel with the 117-scale model AH-1 Operational Loads Survey blades. Careful attention has been given to the detailed flowfield, especially wake structures during BVIs including the miss-distance between vortex and blade, vortex core size, and tip vortex trajectories. The results of flow field including wake systems from various prediction codes show some quantitative differences, but the acoustic results using these calculated airloads as inputs compare reasonably well with test data.