Slat noise source modeling of multi-element airfoil in high-lift configuration

Seung Tae Hwang, Chang Kyun Han, Yong Taek Im, Jong Rok Kim, Youngmin Bae, Young June Moon

Research output: Contribution to journalArticle

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 Rec = 1.7×106. 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 = 20cslat 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 θ = 290° is in good agreement with the data reported in BANC-III, especially the broadband part of the spectrum with a decaying slope ∝ f-3.

Original languageEnglish
Pages (from-to)197-205
Number of pages9
JournalInternational Journal of Aeronautical and Space Sciences
Volume18
Issue number2
DOIs
Publication statusPublished - 2017 Jun 1

Keywords

  • 30P30N multi-element airfoil
  • Computational aeroacoustics
  • Longitudinal vortex
  • Simple source modeling
  • Slat noise

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Materials Science(all)
  • Aerospace Engineering
  • Electrical and Electronic Engineering

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