Conceptual Design of Propulsion Systems for Boundary Layer Ingestion
Doctoral thesis, 2019
On the second front, concerning the application of the developed methods to new propulsion applications, a conceptual design of a propulsion system for a turbo-electric boundary layer ingesting aircraft concept is presented. The aircraft features and aft-mounted fuselage fan for boundary layer ingestion. Earlier studies have shown a theoretical potential of 10% in power savings compared to a conventional aircraft configuration. The fuselage fan is electrically powered and fed by power offtake from two under-wing mounted geared turbofan engines. To this end, a 5 MW-class generator is integrated into the geared turbofans. The generator is connected to a free power turbine that is introduced to facilitate an optimal generator design and to mechanically decouple the generator from the low pressure shaft. A system-level analysis of the designed propulsion system, including the effects of the boundary layer ingesting fuselage fan shows a fuel burn reduction of 0.6%-3.6%, depending on electric machinery technology, compared to a conventional aircraft in the 2050 time frame. The modest reduction, compared to the theoretical potential, is caused by the difficulty of obtaining a benefit from ingesting the outer part of the boundary layer. This benefit is more than offset by electric machinery losses and the reduced efficiency of the fuselage fan compared to the main engine fan.
turbo-electric aircraft
performance modeling
Aviation
boundary layer ingestion
aircraft engine
conceptual design
propulsion integration
Author
Sebastian Samuelsson
Chalmers, Mechanics and Maritime Sciences (M2), Fluid Dynamics
Consistent Conceptual Design and Performance Modeling of Aero Engines
ASME Turbo Expo 2015: Turbine Technical Conference and Exposition, GT 2015; Montreal; Canada; 15 June 2015 through 19 June 2015,;(2015)
Paper in proceeding
Exploring Influence of Static Engine Component Design Variables on System Level Performance
22nd International Symposium on Air Breathing Engines, ISABE2015,;(2015)
Other conference contribution
Concept validation study for fuselage wake-filling propulsion integration
31st Congress of the International Council of the Aeronautical Sciences, ICAS 2018,;(2018)
Paper in proceeding
Conceptual Mean-line Design of a Low Pressure Turbine for a Geared Turbofan with Rear Structure Interaction
Other conference contribution
Adaption of a Turbofan Engine for High Power Offtakes for a Turbo-electric Propulsive Fuselage Concept
ISABE 2019 Papers,;(2019)
Paper in proceeding
Integration Aspects for Large Generators into Turbofan Engines for a Turbo-electric Propulsive Fuselage Concept
24th International Symposium on Air Breathing Engines (ISABE 2019),;(2019)p. 536-552
Paper in proceeding
Samuelsson, S., Grönstedt, T. Performance Analysis of Turbo-electric Propulsion System with Boundary Layer Ingestion
Driving Forces
Sustainable development
Areas of Advance
Transport
Energy
Subject Categories
Aerospace Engineering
ISBN
978-91-7905-193-8
Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: 4660
Publisher
Chalmers
HA3
Opponent: Dr. Wilfried Visser, TU Delft, Nederländerna