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Fan design assessment for BLI propulsion systems

Mennicken, Maximilian and Schönweitz, Dirk and Schnös, Markus and Schnell, Rainer (2021) Fan design assessment for BLI propulsion systems. CEAS Aeronautical Journal, Vol.12 (4). Springer. doi: 10.1007/s13272-021-00532-8. ISSN 1869-5582.

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Official URL: https://link.springer.com/article/10.1007/s13272-021-00532-8


Civil aviation is aiming at fuel efficient aircraft concepts. Propulsion systems using boundary layer ingestion (BLI) are promising to reach this goal. The focus of this study is on the DLR UHBR fan stage of a tube and wing aircraft with rear-integrated engines. In this integration scenario the propulsion system and especially the fan stage receives distorted inflow in steady-state flight conditions. The distortion pattern and distortion intensity are dependent on the operating conditions. Consequently, the interaction of the fan and the distortion changes over the flight envelope. The first part of the paper aims at gaining knowledge of the BLI fan performance in the operating points end of field, approach, cruise (CR) and top of climb (TOC) using high-fidelity, unsteady RANS approaches. The analysis includes fan map performance metrics and a deeper insight into the flow field at CR and TOC. The preliminary design of a fan stage requires fast turn-around times, which are not fulfilled by high-fidelity approaches. Therefore, a fast, throughflow-based methodology is developed, which enables aerodynamicists to design distortion-tolerant fans. The main characteristics of the methodology is outlined in the second part. Consequently, the methodology is taken advantage of to investigate parameter sensitivities in terms of tip speed, blade thickness, solidity, the annulus geometry and a non-axisymmetric stator. This study suggests that distortion-tolerant fans should be designed at higher tip speeds than conventional design experience recommends to limit the local operating point excursion.

Item URL in elib:https://elib.dlr.de/148436/
Document Type:Article
Title:Fan design assessment for BLI propulsion systems
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Mennicken, MaximilianMaximilian.Mennicken (at) dlr.dehttps://orcid.org/0000-0003-3640-0682
Schönweitz, DirkDirk.Schoenweitz (at) dlr.deUNSPECIFIED
Schnös, MarkusMarkus.Schnoes (at) dlr.deUNSPECIFIED
Schnell, RainerRainer.Schnell (at) dlr.deUNSPECIFIED
Date:4 October 2021
Journal or Publication Title:CEAS Aeronautical Journal
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
DOI :10.1007/s13272-021-00532-8
EditorsEmailEditor's ORCID iD
Keywords:Fan design, Boundary layer ingestion, Total pressure distortion, Distorted inflow
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, L - Virtual Engine, L - Components and Emissions
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology
Institute of Propulsion Technology > Fan and Compressor
Deposited By: Mennicken, Maximilian
Deposited On:20 Jan 2022 15:51
Last Modified:20 Jan 2022 15:51

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