reported the analytic design and CFD validation of the inverted-rectangular dorsal intake, along with the stealth-aerodynamic features of the F/AB-31 aircraft. a wide range of freestream Mach numbers, as well as angles of attack were assessed, compared and discussed. Even though that the conceptual design of the F/AB-31 aircraft is exclusively presented, its main contribution provides an extensive data to evaluate the effects of specific aircraft design variables on dorsal intake performance, such as the integration of the cockpit, the boundary layer diverter, and several delta wing planforms at several flight conditions, i.e. Results showed that the stealth and aerodynamic characteristics of a non-conventional fighter aircraft can be optimized through integration analysis processes. These results were compared with computational fluid dynamics (CFD) simulations, which were performed using Reynolds-Averaged-Navier-Stokes (RANS) equations, coupled with the Shear Stress Transport (SST) turbulence model. The aerodynamic characteristics were evaluated through the investigation of the wave drag phenomena of each delta platform, using a linearized mathematical model to intercept the aircraft cross sectional area regarding the angle of the Mach cone produced.
The stealth characteristics were modeled using POFACETS software, which enabled the prediction of the RCS targets using triangular facets. This paper aims to provide an insight about radar cross section (RCS) and aerodynamics of several delta platforms that would help the need and amount of RCS suppression to escape detection from surveillance radars and reduce wave drag. The intake fully integrated into the fuselage combined with an S-duct diffuser provide line-of-sight blockage of the engine blades, satisfying the requirement of low signature, lightweight and low drag for the next generation of aircraft. Survivability and maneuverability have become the major design factors in the development of future military aircraft with stealth ability.
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