Browse > Article
http://dx.doi.org/10.5139/JKSAS.2015.43.6.516

Validation of Rotor Aeroacoustic Noise in Hovering and Low Speed Descent Flight  

You, Younghyun (Department of Aerospace Information Engineering, Konkuk University)
Jung, Sung Nam (Department of Aerospace Information Engineering, Konkuk University)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.43, no.6, 2015 , pp. 516-525 More about this Journal
Abstract
In this paper, the acoustic pressure of a helicopter rotor in hovering and low speed descent flight is predicted and compared with experimental data. Ffowcs Williams-Hawkings equation is used to predict the acoustic pressure. Two different wind tunnel test data are used to validate the predicted results. Boeing 360 model rotor test results are used for the low-frequency noise in hover, and HART II test results are employed for the mid-frequency noise, especially BVI noise, in low speed descent flight. A simple free-wake model as well as the state-of-the-art CFD/CSD coupling method are adopted to perform the analysis. Numerical results show good agreement against the measured data for both low-frequency and mid-frequency harmonic noise signal. The noise carpet results predicted using the FFT(Fast Fourier Transform) shows also reasonable correlation with the measured data.
Keywords
Aeroacoustic; Helicopter; Boeing 360 Model Rotor; HART II test;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
1 Yu, Y. H. "Rotor Blade-Vortex Interaction Noise: Generating Mechanism and its Control Concepts,", the AHS Specialist meeting on Aeromechanics Technology and Product Design for 21st Century, 1995.
2 Fogarty, D. E., Wilbur, M. L. and Sekula, M. k., "A Computational Study of BVI Noise Reduction Using Active Twist Control," AHS 60th Annual Forum, Phoenix, May, 2010.
3 Malovrh, B. and Gandhi, F., "Localized Individual Blade Root Pitch Control for Helicopter Blade-Vortex Interaction Noise Reduction," Journal of the American Helicopter Society, Vol. 55, No. 1, 2010.
4 Brentner, K. S. and Farassat, F., "Modeling Aerodynamically Generated Sound of Helicopter Rotors," Progress in Aerospace Sciences, Vol. 39, No. 2-3, 2003, pp. 83-120.   DOI
5 VERTAIR, "Integration of Technologies in Support of a Passenger and Environmentally Friendly Helicopter," FRIENDCOPER consortium, 2009.
6 Ryu, K. H., "Comparison of Discrete Noise with Broadband Noise from Small-scaled UH-1H Rotor," Journal of the KSAS, Vol. 33, No. 1, 2004, pp. 20-25.
7 Lee, J. H. and Lee, S. G., "Numerical Prediction of Aerodynamic Noise from Rotors,," Proceedings of the KSNVE 1997 Annual Spring Conference, 1997, pp. 581-587.
8 Chung, K., Hwang, C. and Lee, D. J., "Helicopter BVI Noise Prediction Using Acoustic Analogy and High Resolution Airloads of Time Marching Free Wake Method," Transactions of the KSNVE, Vol. 16, No. 3, 2006, pp. 291-297.   DOI
9 Wie, S. Y., Lim, D. K., Lee, D. J., Kwon, J. H, Park, S. H., Kim, S. B., Chung, K. H. and Kim, J. M., "Aerodynamics and Noise of AH-1G Rotor in BVI condition," Proceedings of the KSAS 2008 Fall Conference, 2008, pp. 158-162.
10 Lee, S. M., Lee, J. J, Lee, S. H. and Lee, S. G., "Blade-Vortex Interaction Airloads and Noise Prediction using Blade Deflection Data for HART-II Rotor," Proceedings of the KSAS 2011 Fall Conference, 2011, pp. 685-688.
11 Kang, H. J., Kim, D. H. and Wie, S. Y., "Aerodynamic and Noise Calculations of Helicopter Rotor Blades using Loose CFD-CSD Coupling Methodology," Journal of Computational Fluids Engineering, Vol. 19, No. 3, 2014, pp. 62-68.   DOI
12 Zinner, R. A., Boxwell, D. A. and Spencer, R. H., "Review and Analysis of the DNW/Model 360 Rotor Acoustic Data Base," NASA TM 102253, Nov. 1989.
13 Smith, M. J., Lim, J. W., van der Wall, B. G., Baeder, J. D., Biedron, R. T., Boyd Jr., D. D., Jayaraman, B., Jung, S. N. and Min, B. Y., "The HART II international workshop: an assessment of the state of the art in CFD/CSD prediction,", CEAS Aeronautical Journal, Vol. 4, Issue 4, 2013, pp. 345-372.   DOI
14 Ffowcs Williams, J. E. and Hawkings, D. L., "Sound Generation by Turbulence and Surfaces in Arbitrary Motion," Philosophical Transactions of the Royal Society of London, Vol. 264, 1969, pp.321-342.   DOI
15 van der Wall, B. G., "2nd HHC Aeroacoustic Rotor Test (HART II)-PART II: Representative Results," DLR, German Aerospace Center Inst., Rept. IB-111-2005/03, Braunschweig, Germany. 2005.
16 Schmitz, F. H., Aggarwal, H. R. and Boxwell, D. A., "Prediction Measurement of a Low-Frequency Harmonic Noise of Hovering Model Helicopter Rotor," Journal of Aircraft, Vol. 37, No. 5, 2000, pp.786-795.   DOI
17 Farassat, F., "Derivation of Formulation 1 and 1A of Farassat," NASA TM 214853, 2007.
18 Schmitz, F. H. and Yu, Y. H., "Theoretical Modeling of High-Speed Helicopter Impulsive Noise," Journal of the American Helicopter Society, Vol. 24, No. 1, 1979, pp.10-19.   DOI
19 Jung, S. N., Sa, J. H., You, Y. H., Park, J. S. and Park S. H., "Loose Fluid-Structure Coupled Approach for a Rotor in Descent Incorporating Fuselage Effects," Journal of Aircraft, Vol. 50, No. 4, 2013, pp. 1016-1026.   DOI
20 Sa, J. H., Park, S. H., You, Y. H., Park, J. S., Jung, S. N. and Yu, Y. H., "The Fuselage Effect for Airloads on HART II Rotor Blades," Proceedings of the KSAS 2010 Fall Conference, 2010, pp. 1369-1372.
21 Sim, B. W. and Lim, J. W., "Blade-Vortex Interaction (BVI) Noise and Airloads Prediction using Loose Aerodynamic /Structural Coupling," AHS 62th Annual Forum, Phoenix, May, 2006.