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http://dx.doi.org/10.5139/IJASS.2017.18.2.197

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)
Publication Information
International Journal of Aeronautical and Space Sciences / v.18, no.2, 2017 , pp. 197-205 More about this Journal
Abstract
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 ${\propto}f^{-3}$.
Keywords
Slat noise; 30P30N multi-element airfoil; Computational aeroacoustics; Simple source modeling; Longitudinal vortex;
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