Aerodynamic Design of Inverse Diamond-Back Joined Wing on a Slender Body at Subsonic and Supersonic Mach Numbers

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The paper presents a detailed aerodynamic characterization and performance evaluation of an inverse out-of-plane (IOP) diamond-back joined wing configuration concept using RANS-based CFD simulations and limited experimental validation through low-speed wind tunnel tests. Longitudinal and lateral aerodynamic coefficients at M = 0.3, 0.7, 1.5, and 2.0 as fn. (angle of attack, sideslip angle) are analysed and have been reported in this work. Competing characteristics have been brought through comparison with conventional out-of-plane (OP) design. Detailed flow visualization captured details of the flow interaction of the fore-wing and aft-wing and the effects of downwash. The interference of wing-wing and wing-body is visualized through Q-criterion and vorticity parameter metrics. The IOP-based wing configuration offers advantage over the OP wing, especially at subsonic Mach numbers. At M= 0.7, IOP wing aerodynamic efficiency is about 9.0% more than the OP wing at lower angle of attack flow condition.

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