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CAA Calculations of Vortex Trailing-Edge Interactions Using Nonlinear Disturbance Equations

Lummer, M. and Delfs, J. and Lauke, T. (2002) CAA Calculations of Vortex Trailing-Edge Interactions Using Nonlinear Disturbance Equations. 3rd Aeroacoustics Workshop (SWING), Stuttgart (de), 26.-27.09.2002.

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Abstract

The interaction of vorticity with the trailing edge of airfoils is an important source of airframe noise. In order to study this process, in the present paper the interaction of a single vortex with the trailing edge of a generic airfoil of a modern transport aircraft under 6° angle of attack is calculated by the solution of two-dimensional nonlinear disturbance equations with a RANS mean flow in the Mach number range from 0.2 to 0.5. Non-linearities are taken into account up to first order. The emphasis of the present study rests on the assessment of the influence of the Mach number and non-linearities on the generated sound field. It has been found that the sound intensity downstream of the profile scales up to a mean flow mach number of 0.4 approximately like M*, which is near to the theoretical value. For M = 0.5 larger deviations exist most probably due to a broader mean vorticity profile in the wake. Taking into account non-linearities increases the sound pressure level in case of mathematically negative rotating initial vortices and decreases it in case of positive rotating ones although this effect is not so pronounced than in case of an infinite thin trailing edge.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=2004,
Title:CAA Calculations of Vortex Trailing-Edge Interactions Using Nonlinear Disturbance Equations
Authors:
AuthorsInstitution or Email of Authors
Lummer, M.UNSPECIFIED
Delfs, J.UNSPECIFIED
Lauke, T.UNSPECIFIED
Date:2002
Status:Published
Keywords:Computational Aeroacoustics, Nonlinear Disturbance Equations, Linearized Euler Equations
Event Title:3rd Aeroacoustics Workshop (SWING), Stuttgart (de), 26.-27.09.2002
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Concepts & Integration
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology
Deposited By: Claudia Grant
Deposited On:31 Jan 2006
Last Modified:14 Jan 2010 19:25

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