Slat Noise Source Modeling of Multi-element Airfoil in High-lift Configuration
- Authors
- Hwang, Seung Tae; Han, Chang Kyun; Im, Yong Taek; Kim, Jong Rok; Bae, Youngmin; Moon, Young J.
- Issue Date
- 6월-2017
- Publisher
- KOREAN SOC AERONAUTICAL & SPACE SCIENCES
- Keywords
- Slat noise; 30P30N multi-element airfoil; Computational aeroacoustics; Simple source modeling; Longitudinal vortex
- Citation
- INTERNATIONAL JOURNAL OF AERONAUTICAL AND SPACE SCIENCES, v.18, no.2, pp.197 - 205
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- INTERNATIONAL JOURNAL OF AERONAUTICAL AND SPACE SCIENCES
- Volume
- 18
- Number
- 2
- Start Page
- 197
- End Page
- 205
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/83252
- DOI
- 10.5139/IJASS.2017.18.2.197
- ISSN
- 2093-274X
- 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 = 1.7x10(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'(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 degrees is in good agreement with the data reported in BANC-III, especially the broadband part of the spectrum with a decaying slope proportional to f(-3)
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