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.
Highlights
A Structural Design Concept for a Multi-ShellMajeed Bishara 1, *, Peter Horst 2 , Hinesh Madhusoodanan 3 , Martin Brod 3 , Benedikt Daum 3 and Raimund Rolfes 3 ID
The research project “Energy System Transformation in Aviation (EWL)” has been initiated by the Aeronautics Research Centre Niedersachsen (NFL) in Germany with the aim of reducing CO2 emissions by developing new aircraft concepts and evaluation of new technologies
As a result of the project, the blended wing body (BWB) design concepts were identified as a promising technology path
Summary
Majeed Bishara 1, *, Peter Horst 2 , Hinesh Madhusoodanan 3 , Martin Brod 3 , Benedikt Daum 3 and Raimund Rolfes 3 ID. Aeronautics Research Center Niedersachsen (NFL), TU Braunschweig, Hermann-Blenk-Straße 42, 38108 Braunschweig, Germany. Received: 15 December 2017; Accepted: 3 February 2018; Published: 7 February 2018
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