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Influence of blade elasticity on propeller whirl flutter stability

Koch, Christopher and Koert, Benedikt (2023) Influence of blade elasticity on propeller whirl flutter stability. AIAA SciTech Forum, 2023-01-23 - 2023-01-27, National Harbour, MD, USA. doi: 10.2514/6.2023-1307.

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Official URL: https://arc.aiaa.org/doi/10.2514/6.2023-1307


The prediction of propeller whirl flutter for turboprop aircraft is usually done using aerodynamic derivatives based on rigid propeller blades. This work investigates the influence of blade elasticity on whirl flutter stability based on numerical simulations. The new transfermatrix-method is used to incorporate time domain rotor models from the MBS-code Simpack into frequency domain flutter analyses. The blade modeling in Simpack used in this work utilizes beam models for the blade dynamics and strip theory for aerodynamics. A frequency domain transfer function from hub motion to hub loads is identified using time domain perturbations. The identified transfer matrices are coupled with a simple two-DOF pylon model to explore the effect of elastic blade modeling on whirl flutter stability. Different solution techniques are applied to extract frequency and damping for the pylon whirl modes as well as for the global rotor modes. Results show a significant stabilizing effect for the configurations investigated in this work. Due to a reduction in the aerodynamic cross-coupling moment Mztheta, which usually drives whirl flutter instability, the predictions with elastic blades yield a more stable system, even for very stiff blades. The transfer-matrix-method results match very well with the time domain reference. This paper thus demonstrates an universal method for incorporating complex propeller models into frequency domain flutter analysis of turboprop aircraft

Item URL in elib:https://elib.dlr.de/193770/
Document Type:Conference or Workshop Item (Speech)
Title:Influence of blade elasticity on propeller whirl flutter stability
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Koch, ChristopherUNSPECIFIEDhttps://orcid.org/0000-0001-8014-3041UNSPECIFIED
Date:23 January 2023
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Aeroelastic Stability, Whirl flutter, propeller, blade elasticity
Event Title:AIAA SciTech Forum
Event Location:National Harbour, MD, USA
Event Type:international Conference
Event Start Date:23 January 2023
Event End Date:27 January 2023
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Efficient Vehicle
DLR - Research area:Aeronautics
DLR - Program:L EV - Efficient Vehicle
DLR - Research theme (Project):L - Digital Technologies
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Aeroelastic Simulation
Deposited By: Koch, Christopher
Deposited On:30 Mar 2023 13:42
Last Modified:24 Apr 2024 20:54

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