International Journal of Aeronautical and Space Sciences

  • 제18권2호
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  • Pages.197-205
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  • 2017
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  • 2093-274X(pISSN)
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  • 2093-2480(eISSN)
한국항공우주학회 (The Korean Society for Aeronautical and Space Sciences)
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Slat Noise Source Modeling of Multi-element Airfoil in High-lift Configuration

  • Hwang, Seung Tae (Computational Fluid Dynamics and Acoustics Laboratory, School of Mechanical Engineering, Korea University) ;
  • Han, Chang Kyun (Computational Fluid Dynamics and Acoustics Laboratory, School of Mechanical Engineering, Korea University) ;
  • Im, Yong Taek (Computational Fluid Dynamics and Acoustics Laboratory, School of Mechanical Engineering, Korea University) ;
  • Kim, Jong Rok (Computational Fluid Dynamics and Acoustics Laboratory, School of Mechanical Engineering, Korea University) ;
  • Bae, Youngmin (Computational Fluid Dynamics and Acoustics Laboratory, School of Mechanical Engineering, Korea University) ;
  • Moon, Young J. (Computational Fluid Dynamics and Acoustics Laboratory, School of Mechanical Engineering, Korea University)
  • 투고 : 2017.02.15
  • 심사 : 2017.05.29
  • 발행 : 2017.06.30
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초록

We investigate the slat noise generation mechanism by using large-eddy simulation (LES) and simple source modeling based on linearized Euler equations. An incompressible LES of an MD 30P30N three-element airfoil in the high-lift configuration is conducted at $Re_c=1.7{\times}10^6$. Using the total derivative of the hydrodynamic pressure (DP/Dt) acquired from the incompressible LES, representative noise sources in the slat cove region are characterized in terms of simple sources such as frequency-specific monopoles and dipoles. Acoustic radiation around the 30P30N multi-element airfoil is effectively computed using the Brinkman penalization method incorporated with the linearized Euler equation. The directivity pattern of $p^{\prime}_{rms}$ at $r=20c_{slat}$ in the multiple sources is closely compared to that obtained by the application of the LES/Ffowcs-Williams and Hawking's methods to the entire flow field. The power spectrum of p' at ${\theta}=290^{\circ}$ is in good agreement with the data reported in BANC-III, especially the broadband part of the spectrum with a decaying slope ${\propto}f^{-3}$.

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참고문헌

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