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Open AccessArticle

DLR TAU-Code uRANS Turbofan Modeling for Aircraft Aerodynamics Investigations

by Arne Stuermer
Institute of Aerodynamics and Flow Technology, DLR, 38108 Braunschweig, Germany
This paper is an extended version of my paper published in AIAA Scitech 2019 Forum, San Diego, CA, USA, 7–11 January 2019.
Aerospace 2019, 6(11), 121; https://doi.org/10.3390/aerospace6110121
Received: 27 September 2019 / Revised: 29 October 2019 / Accepted: 30 October 2019 / Published: 3 November 2019
(This article belongs to the Special Issue Progress in Jet Engine Technology)
In the context of an increased focus on fuel efficiency and environmental impact, turbofan engine developments continue towards larger bypass ratio engine designs, with Ultra-High Bypass Ratio (UHBR) engines becoming a likely power plant option for future commercial transport aircraft. These engines promise low specific fuel consumption at the engine level, but the resulting size of the nacelle poses challenges in terms of the installation on the airframe. Thus, their integration on an aircraft requires careful consideration of complex engine–airframe interactions impacting performance, aeroelastics and aeroacoustics on both the airframe and the engine sides. As a partner in the EU funded Clean Sky 2 project ASPIRE, the DLR Institute of Aerodynamics and Flow Technology is contributing to an investigation of numerical analysis approaches, which draws on a generic representative UHBR engine configuration specifically designed in the frame of the project. In the present paper, project results are discussed, which aimed at demonstrating the suitability and accuracy of an unsteady RANS-based engine modeling approach in the context of external aerodynamics focused CFD simulations with the DLR TAU-Code. For this high-fidelity approach with a geometrically fully modeled fan stage, an in-depth study on spatial and temporal resolution requirements was performed, and the results were compared with simpler methods using classical engine boundary conditions. The primary aim is to identify the capabilities and shortcomings of these modeling approaches, and to develop a best-practice for the uRANS simulations as well as determine the best application scenarios. View Full-Text
Keywords: uRANS; aerodynamics; UHBR; turbofan; CFD; installation effects uRANS; aerodynamics; UHBR; turbofan; CFD; installation effects
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Stuermer, A. DLR TAU-Code uRANS Turbofan Modeling for Aircraft Aerodynamics Investigations. Aerospace 2019, 6, 121.

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