Belly fairing design space exploration for a forward natural laminar aircraft

Abstract

A Natural Laminar Flow, forward swept wing with a liftcoefficient of 0.52, a wingspan of 34 meters and an as-pect ratio of 9.47 for a Reynolds number of 23.83 Mil-lion and a Mach number of 0.78 has been developed dur-ing the TuLam/EcoWing projects. In order to tacklewing-fuselage interaction, a new belly-fairing has beendesigned. The belly-fairing is based on parameterizedB-Splines in Catia. On the present study a characteri-zation of the most important parameters and their influ-ence in performance metrics has been assessed and re-fined by the surrogate model approach with SMARTy.The meshes have been generated with SOLAR and theRANS solver TAU has been used for the simulations. Theresults show the high degree of influence that the belly-fairing has in the overall performance. Some geometriesachieve a glide ratio close to 23.5 for cruise conditionswith free transition and 20.5 with 5% tripped transition.