Abstract:
PURPOSE: The purpose of this study is to re-evaluation fuselage design when the main wing’s has the ability to fulfill stability requirements without
the need for a tailplane. The aerodynamic requirements of the fuselage usually involve a trade-off between reducing drag and providing enough
length for positioning the empennage to ensure stability. However, if the main wing can fulfill the stability requirements without the need for a
tailplane, then the fuselage design requirements can be re-evaluated. The optimisation of the fuselage can then include reducing drag and also
providing a component of lift amongst other potential new requirements.
DESIGN/METHODOLOGY/APPROACH: A careful investigation of parameterisation and trade-off optimisation methods to create such fuselage shapes
was performed. The A320 Neo aircraft is optimised using a parameterised 3D fuselage model constructed with a modified PARSEC method and the
SHERPA optimisation strategy, which was validated through three case studies. The geometry adjustments in relation to the specific flow
phenomena are considered for the three optimal designs to investigate the influencing factors that should be considered for further optimisation.
FINDINGS: The top three aerodynamic designs show a distinctive characteristic in the low aspect ratio thick wing-like aftbody that has pressure drag
penalties, and the aftbody camber increased surface area notably improved the fuselage’s lift characteristics.
ORIGINALITY/VALUE: This work contributes to the development of a novel set of design requirements for a fuselage, free from the constraints imposed
by stability requirements. By gaining insights into the flow phenomena that influence geometric designs when a lift requirement is introduced to the
fuselage, we can understand how the fuselage configuration was optimised. This research lays the groundwork for identifying innovative design criteria
that could extend into the integration of propulsion of the aftbody.
