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A uRANS-Based Hybrid CFD/CAA-Methodology for the Analysis of CROR Low-Speed Aerodynamic and Aeroacoustic Installation Effects

Stürmer, Arne (2022) A uRANS-Based Hybrid CFD/CAA-Methodology for the Analysis of CROR Low-Speed Aerodynamic and Aeroacoustic Installation Effects. DLR-Forschungsbericht. DLR-FB-2022-25. Dissertation. Universität Stuttgart. 212 S. doi: 10.57676/qj7f-a004.

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Abstract

Contra-Rotating Open Rotor (CROR) engines promise a significant efficiency improvement over turbofan engines, which they derive from their ultra-high bypass ratio, made possible through the omission of a nacelle around the contra rotating co-axial rotors. However, the absence of the nacelle as well as the complex aerodynamic interactions between the two rotors also make meeting requirements of further reductions in noise emissions a significant technical challenge. In this thesis a flexible and robust simulation approach is developed, which, through the coupling of modern numerical tools for the aerodynamic and aeroacoustic analysis, allows for a detailed and precise multi-disciplinary analysis of CROR powered aircraft configurations. In addition to establishing an accurate and efficient simulation approach, the validation of this methodology is a central aspect of this work. It is demonstrated that this coupled simulation method delivers high accuracy in the prediction of the aerodynamic performance of isolated and aircraft-installed CROR engines and yields an accurate representation of the impact of installation effects on the noise emissions. The application of this approach to the analysis of successively more complex CROR engine-airframe installation scenarios furthermore demonstrates the valuable insights gained on the complex aerodynamic phenomena as well as key tonal noise source mechanisms on the basis of the simulation data.

Item URL in elib:https://elib.dlr.de/191010/
Document Type:Monograph (DLR-Forschungsbericht, Dissertation)
Title:A uRANS-Based Hybrid CFD/CAA-Methodology for the Analysis of CROR Low-Speed Aerodynamic and Aeroacoustic Installation Effects
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Stürmer, ArneUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Date:November 2022
Refereed publication:Yes
Open Access:Yes
DOI:10.57676/qj7f-a004
Number of Pages:212
ISSN:1434-8454
Status:Published
Keywords:Aerodynamics, aeroacoustics, propeller, CROR, open rotor, installation effects, simulation, validation, unsteady flows, uRANS
Institution:Universität Stuttgart
Department:Fakultät für Luft- und Raumfahrttechnik und Geodäsie
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Clean Propulsion
DLR - Research area:Aeronautics
DLR - Program:L CP - Clean Propulsion
DLR - Research theme (Project):L - Future Engines and Engine Integration
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Transport Aircraft
Deposited By: Stürmer, Arne
Deposited On:30 Nov 2022 11:32
Last Modified:01 Dec 2022 08:45

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