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Parametric Study for the Low BVI Noise Rotor Blade Design
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 Title & Authors
Parametric Study for the Low BVI Noise Rotor Blade Design
Hwang, Chang-Jeon; Joo, Gene;
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Compared to the noise limits (CAN7) specified in ICAO Annex 16 for civil helicopters, the Lynx helicopter equipped with BERP blades has only 0.2 EPNdB margin in the approach case although it has more than 4 EPNdB margin in fly-over and take-off conditions. The objectives of the study described in this paper were to devise a low noise main rotor blade for the Lynx using UEAF combined with the high resolution airload model ACROT. A design requirement is that the new blade, KBERP (Korean BERP) blade should achieve a significant reduction in noise during approach(at least 6EPNdB margin) without any noise penalty in fly-over and take-off conditions and minimal performance penalty. It was decided to investigate a tip modification to the BERP blade, employing the twin vortex concept to reduce the BVI noise and to retain the excellent high speed performance characteristics of BERP. Through the parametric study, the KBERP blade with optimized twin vortices has at least a 9 EPNdB noise margin in approach flight condition with only a small penalty in fly-over and take-off conditions. The KBERP tip is thus a very cost effective wav to reduce BVI noise during approach.
BVI Noise Reduction;Vane Tip;BERP;KBERP;
 Cited by
l. Gandhi, F. and Tauszig, L., 2000, "Influence of Individual Interactions on Helicopter Blade-Vortex Interaction Noise", The 26th European Rotorcraft Forum Proceedings

Brocklehurst, A. and Pike A. C., 1994, "Reduction of BVI Noise using a Vane Tip",AHS Aeromechanics Specialists Conference Proceedings

Murashige, A. et al., 2000, "Second ATIC Aeroacoutic Model Rotor Test at DNW",The 26th European Rotorcraft Forum Proceedings

Leverton, J. W. and Pike, A. C., 1992, "Lynx High Perfonnance Low Noise", DGLR/ AIAA 14th Aeroocoustics Conference

Perry F. J., Wilby P. G. and Jones A. F., 1998, "The BERP Rotor How Does It Work, and What Has It Been Doing Lately?", Vertiflite, Spring

Beddoes, T. S. and Pike A. C., 1996, "Noise Reduction with a Twin Tip Vortex Configuration", AHS 52nd Annual Forum

Perry, F. J. et al., 1999, US Patent 5992793

Pike, A. C., 1987, "Application of High Resolution Airload Calculations to Helicopter Noise Prediction", AHS Specialist Meeting on Aerodynamics and Aeroocoustics

Pike, A. C., 1991, "Validation of High Frequency Airload Calculations using Full Scale Flight Test Acoustic Data", AHS/RAEs Specialist Meeting on Rotorcraft Acoustics and Rotor Fluid Dynamics

Beddoes, T. S., 1985, "A Wake Model for High Resolution Airloads", Army/AHS Intemational Conference on Rotorcraft Basic Research