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http://dx.doi.org/10.5050/KSNVN.2006.16.3.291

Helicopter BVI Noise Prediction Using Acoustic Analogy and High Resolution Airloads of Time Marching Free Wake Method  

Chung, K. (한국항공우주연구원)
Lee, D.J. (한국과학기술원 항공우주공학과)
Hwang, C. (한국항공우주연구원)
Publication Information
Transactions of the Korean Society for Noise and Vibration Engineering / v.16, no.3, 2006 , pp. 291-297 More about this Journal
Abstract
The BVI(blade vortex interaction) noise Prediction has been one of the most challenging acoustic analyses in helicopter aeromechanical Phenomenon. It is well known high resolution airloads data with accurate tip vortex positions are necessary for the accurate prediction of this phenomenon. The truly unsteady time-marching free-wake method, which is able to capture the tip vortices instability in hover and axial flights, is expanded with the rotor flapping motion and trim routine to predict unsteady airloads in forward and descent flights. And Farassat formulation 1-A based on the FW-H equation is applied for the noise prediction considering the blade flapping motion. Main objective of this study is to validate the newly developed prediction code. To achieve the objective, the descent flight condition of AH-1 OLS(operational loads survey) configuration is analyzed using present code. The predicted sectional thrust distribution and sectional airloads time histories show the present scheme is able to capture well the unsteady airloads caused by a parallel BVI. Finally, the predicted noise data, observed in two different positions where are 3.44 times of rotor radius far from the hub center, are quite reasonable agreements with the experimental data compared to the other analysis results.
Keywords
Helicopter Rotor Noise; BVI; Time Marching Free Wake Method; High Resolution Airloads; Acoustic Analogy;
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