한국음향학회지 (The Journal of the Acoustical Society of Korea)

  • 제32권5호
  • /
  • Pages.369-376
  • /
  • 2013
  • /
  • 1225-4428(pISSN)
  • /
  • 2287-3775(eISSN)
한국음향학회 (The Acoustical Society of Korea)
권호 표지
DOI QR코드

DOI QR Code

복합 전산 공력음향학(CAA) 방법을 이용한 시간영역 풍력터빈 저주파수 소음 예측과 분석

Time Domain Prediction and Analysis of Low Frequency Noise from Wind Turbine using Hybrid Computational Aeroacoustics (CAA) Method

  • 투고 : 2013.05.08
  • 심사 : 2013.06.20
  • 발행 : 2013.09.30
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

Lowson의 음향상사식을 이용하여 시간영역에서 풍력터빈의 저주파수 소음을 예측 하였고, 관련 소음원들의 기여도를 분석하였다. 소음원으로서 날개-깃 상 평균 압력 분포를 구하기 위하여 XFOIL를 이용하였다. 이 때, 소음 예측 시 입력 값 인 유한 요소 상의 힘을 계산하기 위해 날개-깃을 여러 개의 요소로 분할하였다. 소음원을 힘 섭동항, 가속도항, 속도항으로 분리하여 주파수 기여도를 분석하였다. 끝으로, 예측 스펙트럼을 운용 중 인 풍력터빈에 대하여 측정한 저주파수 소음과 비교하였고, 그 결과 풍속 증가에 따라 힘 섭동 성분이 저주파수에서 크게 기여하는 것을 확인하였다.

Using Lowson's acoustic analogy, low frequency noise of a wind turbine (WT) is predicted in time domain and the noise sources contributing to the low frequency noise is analyzed. To compute averaged pressure distribution on blades of the WT as noise source, XFOIL is utilized. The blade source domain is divided into several segments along the span direction to compute force exerted on air surrounding the blade segments, which is used as input for noise prediction. The noise sources are decomposed into three terms of force fluctuation, acceleration and velocity terms and are analyzed to investigate each spectral contribution. Finally, predicted spectra are compared with measured low frequency noise spectrum of a wind turbine in operation. It is found that the force fluctuation component contributes strongly in low frequency range with increasing wind speed.

키워드

참고문헌

  1. G. Leventhall, "Infrasound from wind turbine," Canadian Acoustics, 34, 29-36 (2006).
  2. S. S. Jung, W.-S. Cheung, C. Cheong and S.-H. Shin, "Experimental identification of acoustic emission characteristics of large wind turbines with emphasis on infrasound and low-frequency noise" (in Korean), J. Korean Phys. Soc. 53, 1897-1905 (2008).
  3. L. D. Knopper and C. A. Ollson, "Health effects and wind turbines: A review of the literature," Environ. Health-Glob. 10, 78-87 (2011). https://doi.org/10.1186/1476-069X-10-78
  4. J. E. Williams and D. L. Hawkings, "Sound generated by turbulence and surfaces in arbitrary motion," Philos. T. Roy. Soc. A. A264, 321-342 (1969).
  5. M. J. Lighthill, "Sound generated aerodynamically (Bakerian Lecture)," Proc. R. Soc. Lon. Ser.-A. 267, 47-182 (1961).
  6. M. V. Lowson, "The sound field for singularities in motion," P. Roy. Soc. Lond. A Mat. 286, 559-572 (1965). https://doi.org/10.1098/rspa.1965.0164
  7. B. A. Singer, D. P. Lockard, and G. M. Lilley, "Hybrid acoustic predictions," Comput. Math. Appl. 46, 647-669 (2003). https://doi.org/10.1016/S0898-1221(03)90023-X
  8. T. F. Brooks, D. S. Pope, and M. A. Marcolini, "Airfoil self-noise and prediction," NASA reference publication 1218, 1989.
  9. M. V. Lowson, "A new prediction model for wind turbine noise," Wind Eng. 18, 51-61 (1994).
  10. Wei Jun Zhu, Modelling of Noise from Wind Turbine, (M. S. thesis, Technical University of Denmark, 2004).
  11. Drela, Mark, "XFOIL: An analysis and design system for low reynolds number airfoils," in Low Reynolds Number Aerodynamics, edited by Thomas J. Mueller (Springer, Berlin Heidelberg, 1989), pp. 1-12.
  12. Martin O. L. Hansen, Aerodynamics of Wind Turbines 2nd ed., (Earthscan, London, 2008), pp. 85-103.
  13. IEC 61400-11:2002, Wind Turbines Part 11: Acoustic noise measurement techniques, 2002.
  14. J. E. Williams and L. H. Hall, "Aerodynamic sound generation by turbulent flow in the vicinity of a scattering half plane," J. Fluid Mech. 40, 657-670 (1970). https://doi.org/10.1017/S0022112070000368
  15. G-S Lee, C. Cheong, S-H. Shin, and S-S. Jung, "A case study of localization and identification of noise sources from a pitch and a stall regulated wind turbine," Appl. Acoust. 73, 817-827 (2012). https://doi.org/10.1016/j.apacoust.2012.03.001
  16. R. K. Amiet, "Acoustic radiation from an airfoil in a turbulent stream," J. Sound Vib. 41, 407-420 (1975). https://doi.org/10.1016/S0022-460X(75)80105-2
  17. L. Gutin, "On the sound field of a rotating propeller," Translated as NACA Thec. Memo 1195 NACA, 1936.
  18. G-S. Lee, C. Cheong, H-T. Kim, and W-H. Joo, "Prediction and analysis of wind turbine low frequency noise" (in Korean), J. Acoust. Soc. Kr. Suppl. 1(s) 32 , 250-254 (2013).