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Flutter Prediction of a Laminar Airfoil Applying a Corrected Doublet Lattice Method Based on Experimental Derivatives

Hebler, Anne and Thormann, Reik (2014) Flutter Prediction of a Laminar Airfoil Applying a Corrected Doublet Lattice Method Based on Experimental Derivatives. 19. DGLR-Fach-Symposium der STAB, 04.-05.11.2014, München, Deutschland.

Full text not available from this repository.

Abstract

In this paper a stability analysis of a two dimensional laminar airfoil with two degrees-of-freedom is presented and compared to turbulent flow conditions. The process for the flutter calculations is introduced, containing a description of the structural parameters, the aerodynamic derivatives due to a pitch motion, which are identified experimentally and two DLM correction methods to determine the aerodynamic derivatives due to a heave motion. For the local pressure distributions the corrections include nonlinearities due to transonic flow as well as transitional effects. The resulting aerodynamic derivatives reflect the differences between laminar and turbulent flow as measured in the experiment. An influence of the mean angle-of-attack on the stability boundary is shown for free transition. A comparison of the flutter boundaries for free and fixed transition exhibits a lower transonic dip for free transition. One-degree-of-freedom flutter is found only for free transition.

Item URL in elib:https://elib.dlr.de/91638/
Document Type:Conference or Workshop Item (Speech)
Title:Flutter Prediction of a Laminar Airfoil Applying a Corrected Doublet Lattice Method Based on Experimental Derivatives
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hebler, Anneanne.hebler (at) dlr.deUNSPECIFIED
Thormann, Reikreik.thormann (at) dlr.deUNSPECIFIED
Date:4 November 2014
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Accepted
Keywords:laminar flow, flutter, DLM, forced pitch oscillations, transonic flow
Event Title:19. DGLR-Fach-Symposium der STAB
Event Location:München, Deutschland
Event Type:national Conference
Event Dates:04.-05.11.2014
Organizer:AG STAB
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Aeroelastic Experiments
Institute of Aeroelasticity > Aeroelastic Simulations
Deposited By: Hebler, Anne
Deposited On:13 Jan 2015 09:08
Last Modified:13 Jan 2015 09:08

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