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Assessment of structural mechanical effects related to torsional deformations of propellers

  • Lifting propellers are of increasing interest for Advanced Air Mobility. All propellers and rotors are initially twisted beams, showing significant extension–twist coupling and centrifugal twisting. Torsional deformations severely impact aerodynamic performance. This paper presents a novel approach to assess different reasons for torsional deformations. A reduced-order model runs large parameter sweeps with algebraic formulations and numerical solution procedures. Generic beams represent three different propeller types for General Aviation, Commercial Aviation, and Advanced Air Mobility. Simulations include solid and hollow cross-sections made of aluminum, steel, and carbon fiber-reinforced polymer. The investigation shows that centrifugal twisting moments depend on both the elastic and initial twist. The determination of the centrifugal twisting moment solely based on the initial twist suffers from errors exceeding 5% in some cases. The nonlinear parts of the torsional rigidity do not significantly impact the overall torsional rigidity for the investigated propeller types. The extension–twist coupling related to the initial and elastic twist in combination with tension forces significantly impacts the net cross-sectional torsional loads. While the increase in torsional stiffness due to initial twist contributes to the overall stiffness for General and Commercial Aviation propellers, its contribution to the lift propeller’s stiffness is limited. The paper closes with the presentation of approximations for each effect identified as significant. Numerical evaluations are necessary to determine each effect for inhomogeneous cross-sections made of anisotropic material.

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Metadaten
Author:Felix MöhrenORCiD, Ole BergmannORCiD, Frank Janser, Carsten BraunORCiD
DOI:https://doi.org/10.1007/s13272-024-00737-7
ISSN:1869-5590 (eISSN)
ISSN:1869-5582
Parent Title (English):CEAS Aeronautical Journal
Publisher:Springer
Place of publication:Wien
Document Type:Article
Language:English
Year of Completion:2024
Date of the Publication (Server):2024/06/04
Tag:Centrifugal twisting moment; Extension–twist coupling; Lifting propeller; Trapeze effect
Length:22 Seiten
Note:
Corresponding author: Felix Möhren
Zugriffsart:weltweit
Institutes:FH Aachen / ECSM European Center for Sustainable Mobility
FH Aachen / Fachbereich Luft- und Raumfahrttechnik
FH Aachen / Fachbereich Wirtschaftswissenschaften
open_access (DINI-Set):open_access
collections:Verlag / Springer
Open Access / Hybrid
Geförderte OA-Publikationen / DEAL Springer
Licence (German): Creative Commons - Namensnennung