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Slat Noise Trend Predictions Using CAA With Stochastic Sound Sources From A Random Particle-Mesh Method (RPM)

Ewert, Roland (2006) Slat Noise Trend Predictions Using CAA With Stochastic Sound Sources From A Random Particle-Mesh Method (RPM). In: AIAA 2006-2667. 12th AIAA/CEAS Aeroacoustics Conference, 2006-05-08 - 2006-05-11, Cambridge, MA (USA).



Slat Noise simulations are carried out for a high-lift airfoil. The high-lift airfoil geometry is a two-element slat-airfoil configuration without deployed flap in order to avoid additional sound sources at the flap. A low-cost CAA approach is applied, which is based on acoustic perturbation equations (APE) in the time-domain that are forced by stochastic sound sources. The stochastic model was introduced in AIAA 2005-2862 and is based on the spatial convolution of white-noise with a filter kernel and can reproduce target distributions of turbulent kinetic energy and length scales, e.g., provided by a steady RANS computation of the turbulent flow problem. The Mach number scaling law of the broadband slat noise component is evaluated based on three different freestream velocities (M=0.088, 0.118, 0.165). The capability of the stochastic method to reproduce a target turbulence kinetic energy topology is studied. The effect of model parameter variations on the quality of the reproduced turbulent kinetic energy distribution and its effect on the predicted far-field spectrum is evaluated. Only a small dependence on the model parameter is found. The effect of slat gap variation on the broadband acoustic far-field is studied for three different slat configurations, which encompass beside the reference slat position one configuration with reduced, and one with increased slat gap. Previous experimental findings at a full three-element high-lift airfoil indicated an effective dependence of the slat gap width on the acoustic far-field with typically 5dB reduction for a slat gap reduction of about 15\% due to a decrease of the velocity of about 25\%. The current study investigates this effect for the two-element high-lift configuration.

Item URL in elib:https://elib.dlr.de/19807/
Document Type:Conference or Workshop Item (Paper)
Title:Slat Noise Trend Predictions Using CAA With Stochastic Sound Sources From A Random Particle-Mesh Method (RPM)
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:May 2006
Journal or Publication Title:AIAA 2006-2667
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:CAA, APE, RPM, Slat Noise
Event Title:12th AIAA/CEAS Aeroacoustics Conference
Event Location:Cambridge, MA (USA)
Event Type:international Conference
Event Start Date:8 May 2006
Event End Date:11 May 2006
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Quiet Air Traffic (old)
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Ewert, Dr.-Ing. Roland
Deposited On:08 Nov 2006
Last Modified:24 Apr 2024 19:01

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