Evaluation of ultra-high bypass ratio engines for an over-wing aircraft configuration

Author:

Giesecke Daniel1,Lehmler Marcel1,Friedrichs Jens1,Blinstrub Jason2,Bertsch Lothar2,Heinze Wolfgang3

Affiliation:

1. TU Braunschweig Institute of Jet Propulsion and Turbomachinery Hermann-Blenk-Str. 37 38108 Braunschweig Germany

2. German Aerospace Center Institute of Aerodynamics and Flow Technology Bunsenstraße 10 37073 Göttingen Germany

3. TU Braunschweig Institute of Aircraft Design and Lightweight Structures Hermann-Blenk-Str. 35 38108 Braunschweig Germany

Abstract

Today, main hub airports are already at their capacity limit and hence, smaller airports have become more interesting for providing point-to-point connections. Unfortunately, the use of regional airports induces an increased environmental footprint for the population living around it. In an attempt to solve the related problems, the research project Coordinated Research Centre 880 aims to examine the fundamentals of a single-aisle aircraft with active high-lift configuration powered by two geared ultra-high bypass turbofan engines mounted over the wing. Low direct operating costs, noise shielding due to the over-wing configuration, and short runway lengths are the main advantages. Highlighting the performance, economical and noise benefits of a geared ultra-high bypass engine is the key aim of this paper. This assessment includes a correspondingly adjusted aircraft. Open literature values are applied to design the two investigated bypass ratios; a reference engine with a bypass ratio of 5 and 17 respectively. This study shows that a careful selection of engine mass flow, turbine entry temperature and overall pressure ratio determines the desirable bypass ratio. The aircraft direct operating costs drop by 5.7% when comparing the designed conventional with a future ultra-high bypass ratio engine. Furthermore, the sound at source for a selected mission and operating condition can be reduced by 7 dB. A variable bypass nozzle area for the ultra-high bypass ratio engine is analysed in terms of performance and operability. An increase of safety margin is shown for the turbofan engine with a variable bypass nozzle. It is concluded that this unconventional aircraft configuration with ultra-high bypass ratio engines mounted over the wing has the potential to relieve main hub airports and reduce the environmental impact.

Publisher

Global Power and Propulsion Society

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