Investigation in The Close-Ground Characteristics of Torsional Damping Flap
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Abstract
Ground effects have a significant impact on road vehicles, particularly on blended wing body and lightweight designs. Racing vehicles participating in the World Solar Challenge fall into this category. A computational fluid dynamics (CFD) simulation was conducted for the NACA 0015 airfoil to investigate the effects of a torsional damping flap with ground effects. The analytical model demonstrated that an 1/4 chord-length torsional damping flap can reduce lift variation by 25%. However, the CFD results showed less efficacy because the analytical model was idealized using a thin plate model under no-slip conditions. In close-ground situations, the lift-alleviation performance of the flap is suppressed at low angles of attack but recovers at higher angles of attack, above 10 degrees. This behavior is attributed to the suppression of flow separation by the torsional damping flap.
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