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- W2323491334 abstract "From the start of aviation, designers have been searching for methods and technologies to reduce the required fuel burn of commercial aircraft. Wingtip devices in special winglets offer a way of significant drag reduction for transport airplanes. Winglets alongside with tip tanks, raked wingtips as well as aligned fans belong to this class of wingtip devices. Although winglets are targeted to induced drag reduction, their effects can also be extended to wave and zero-lift drag. Induced drag alone is responsible for 30-40% of the overall drag of a transport airplane at long-range cruise condition and for considerably downgrading the climb performance of fixed-wing aircraft. Better investigation in this field employing CFD tools and extensive wind-tunnel testing has allowed the rise of efficient winglet designs in recent times. Several of newly designed aircraft configurations embody winglets and many of the older ones are being retrofitted. However, there are discussions concerning the best cost/benefit ratio of reducing induced drag of a transport plane with wingtip devices. Another big issue is the associated penalties to the configuration caused by winglets when compared to a simple wingtip extension. Two winglet optimization studies were carried-out for a 70-seat airliner. In the first simulation, wing and winglet were optimized for cruise and field performance. In the second study, optimization was carried out for wings without winglet. The Pareto front for the configuration with winglets lies above the one obtained from the optimization for wing-body alone, justifying the adoption of winglets from the aerodynamic point of view." @default.
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- W2323491334 date "2015-06-18" @default.
- W2323491334 modified "2023-09-26" @default.
- W2323491334 title "Considerations about Wingtip Devices Design of Transport Airplane" @default.
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- W2323491334 doi "https://doi.org/10.2514/6.2015-3437" @default.
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