Blade-Vortex Interaction (BVI) Noise and Airload Prediction Using Loose Aerodynamic/Structural CouplingPredictions of blade-vortex interaction (BVI) noise, using blade airloads obtained from a coupled aerodynamic and structural methodology, are presented. This methodology uses an iterative, loosely-coupled trim strategy to cycle information between the OVERFLOW-2 (CFD) and CAMRAD-II (CSD) codes. Results are compared to the HART-II baseline, minimum noise and minimum vibration conditions. It is shown that this CFD/CSD state-of-the-art approach is able to capture blade airload and noise radiation characteristics associated with BVI. With the exception of the HART-II minimum noise condition, predicted advancing and retreating side BVI for the baseline and minimum vibration conditions agrees favorably with measured data. Although the BVI airloads and noise amplitudes are generally under-predicted, this CFD/CSD methodology provides an overall noteworthy improvement over the lifting line aerodynamics and free-wake models typically used in CSD comprehensive analysis codes.
Document ID
20070018199
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Sim, B. W. (NASA Ames Research Center Moffett Field, CA, United States)
Lim, J. W. (Army Research, Development and Engineering Command Moffett Field, CA, United States)