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

Bishara, Majeed GND; Horst, Peter GND; Madhusoodanan, Hinesh; Brod, Martin; Daum, Benedikt ORCID; Rolfes, Raimund ORCID

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.


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Bishara, Majeed / Horst, Peter / Madhusoodanan, Hinesh / et al: A Structural Design Concept for a Multi-Shell Blended Wing Body with Laminar Flow Control. Braunschweig 2018.

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