This paper describes the work performed by Onera on disruptive aircraft architectures in the frame of the Clean Sky2 -ITD Airframe European project. This paper details first the Overall Aircraft Design process set-up to evaluate the performance of four innovative concepts (lifting fuselage, 3-surfaces, joined-wing and Blended Wing Body configurations) on two specific missions (A320-like and businesslike). To improve the accuracy of the process and integrate more refined physical models, high-fidelity tools were introduced in the process for aerodynamics (CFD Euler computations) and structure (Finite Element Model). As far as propulsion aspects are concerned, a specific module was developed in order take into account the thermodynamic effects in the process and resize the engine at each step of the process. Regarding handling qualities a generic module was developed in order to take into account certification criteria early in the design process. For the acoustic and aeroelastic aspects, supplementary analysis methods are proposed in order to quantify the noise reduction benefits from the source modifications and shielding effects by these geometries and potential aero-elastic issues.
This paper presents recent applications of multi-disciplinary optimizations involving high-fidelity analyses for the aerodynamics, structures and aeroacoustics discipline. Three application cases pertaining to aircraft flight physics design are used to illustrate the recent MDAO capabilities developed internally at ONERA.
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