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Energies 2018, 11(2), 383; https://doi.org/10.3390/en11020383

A Structural Design Concept for a Multi-Shell Blended Wing Body with Laminar Flow Control

1
Aeronautics Research Center Niedersachsen (NFL), TU Braunschweig, Hermann-Blenk-Straße 42, 38108 Braunschweig, Germany
2
Institute of Aircraft Design and Lightweight Structures, TU Braunschweig, Hermann-Blenk-Straße 35, 38108 Braunschweig, Germany
3
Institute of Structural Analysis, Leibniz University of Hannover, Appelstraße 9A, 30167 Hannover, Germany
*
Author to whom correspondence should be addressed.
Received: 15 December 2017 / Revised: 2 February 2018 / Accepted: 3 February 2018 / Published: 7 February 2018
(This article belongs to the Special Issue Towards a Transformation to Sustainable Aviation Systems)
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Abstract

Static and fatigue analyses are presented for a new blended wing body (BWB) fuselage concept considering laminar flow control (LFC) by boundary layer suction in order to reduce the aerodynamic drag. BWB aircraft design concepts profit from a structurally beneficial distribution of lift and weight and allow a better utilization of interior space over conventional layouts. A structurally efficient design concept for the pressurized BWB cabin is a vaulted layout that is, however, aerodynamically disadvantageous. A suitable remedy is a multi-shell design concept with a separate outer skin. The synergetic combination of such a multi-shell BWB fuselage with a LFC via perforation of the outer skin to attain a drag reduction appears promising. In this work, two relevant structural design aspects are considered. First, a numerical model for a ribbed double-shell design of a fuselage segment is analyzed. Second, fatigue aspects of the perforation in the outer skin are investigated. A design making use of controlled fiber orientation is proposed for the perforated skin. The fatigue behavior is compared to perforation methods with conventional fiber topologies and to configurations without perforations. View Full-Text
Keywords: blended wing body; multi-bubble fuselage; structural analysis; controlled fiber placement; fiber-reinforced plastics; fatigue; degradation; damage model blended wing body; multi-bubble fuselage; structural analysis; controlled fiber placement; fiber-reinforced plastics; fatigue; degradation; damage model
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Bishara, M.; Horst, P.; Madhusoodanan, H.; Brod, M.; Daum, B.; Rolfes, R. A Structural Design Concept for a Multi-Shell Blended Wing Body with Laminar Flow Control. Energies 2018, 11, 383.

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