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Assessment of a Turbo-Electric Aircraft Configuration with Aft-Propulsion Using Boundary Layer Ingestion

Schnell, Rainer and Zhao, Xin and Rallis, Efthymios and Kavvalos, Mavroudis and Sahoo, Smruti and Schnoes, Markus and Kyprianidis, Konstantinos (2019) Assessment of a Turbo-Electric Aircraft Configuration with Aft-Propulsion Using Boundary Layer Ingestion. Aerospace, 6 (12) (134). Multidisciplinary Digital Publishing Institute (MDPI). DOI: 10.3390/aerospace6120134 ISSN 2226-4310

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Official URL: https://www.mdpi.com/2226-4310/6/12/134

Abstract

In this paper, a turbo-electric propulsion system was analyzed, and its performance was assessed. The aircraft considered here was a single-aisle, medium-range configuration targeting a capacity of 150 Pax. The propulsion concept comprised two boosted geared turbofan engines mounted under-wing. Those main engines were supported by an electrically driven aft-propulsor contributing to the thrust generation and by taking advantage of ingesting the boundary layer of the fuselage for potentially higher levels of propulsive efficiency and allowing for the improved operation of the main engines. The performance assessment as carried out in the context of this paper involved different levels: Firstly, based on the reference aircraft and the detailed description of its major components, the engine performance model for both main engines, as well as for the electrically driven aft-propulsor was set up. The methodology, as introduced, has already been applied in the context of hybrid-electric propulsion and allowed for the aforementioned aircraft sizing, as well as the subsequent gas turbine multi-point synthesis (simulation). A geared turbofan architecture with 2035 technology assumptions was considered for the main engine configuration. The present trade study focused on the design and performance analysis of the aft-propulsor and how it affected the performance of the main engines, due to the electric power generation. In order to allow for a more accurate description of the performance of this particular module, the enhanced streamline curvature method with an underlying and pre-optimized profile database was used to design a propulsor tailored to meet the requirements of the aft propulsor as derived from the cycle synthesis and overall aircraft specification; existing design expertise for novel and highly integrated propulsors could be taken advantage of herein. The resulting performance characteristics from the streamline curvature method were then fed back to the engine performance model in a closely coupled approach in order to have a more accurate description of the module behavior. This direct coupling allowed for enhanced sensitivity studies, monitoring different top-level parameters, such as the thrust/power split between the main engines and the aft propulsor. As a result, different propulsor specifications and fan designs with optimal performance characteristics were achieved, which in return affected the performance of all subsystems considered.

Item URL in elib:https://elib.dlr.de/132971/
Document Type:Article
Title:Assessment of a Turbo-Electric Aircraft Configuration with Aft-Propulsion Using Boundary Layer Ingestion
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schnell, RainerAT-FVUNSPECIFIED
Zhao, XinMälardalen University, SwedenUNSPECIFIED
Rallis, EfthymiosAristotle University of ThessalonikiUNSPECIFIED
Kavvalos, MavroudisMälardalen University, SwedenUNSPECIFIED
Sahoo, SmrutiMälardalen University, SwedenUNSPECIFIED
Schnoes, MarkusAT-FVUNSPECIFIED
Kyprianidis, KonstantinosMälardalen University, SwedenUNSPECIFIED
Date:16 December 2019
Journal or Publication Title:Aerospace
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:6 (12)
DOI :10.3390/aerospace6120134
Editors:
EditorsEmail
UNSPECIFIEDMPDI
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
Series Name:MPDI Aerospace 2019 Special Issue Jet Propulsion
ISSN:2226-4310
Status:Published
Keywords:turbofans; civil aviation; turbo-electric propulsion; boundary layer ingestion (BLI); multi-point gas turbine synthesis; propulsor design; streamline curvature
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Concepts and Integration, L - Air Traffic Concepts and Operation, L - Fan and Compressor Technologies
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Fan and Compressor
Deposited By: Schnell, Dr.-Ing. Rainer
Deposited On:18 Dec 2019 12:05
Last Modified:18 Dec 2019 12:05

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