Abstract
When reducing the drag of the aircraft using winglet, the size of the winglet is limited mainly under the wing root bending moment increment (ΔBM) due to the winglet. The existence of the maximum possible drag reduction (ΔCD) at certain ΔBM is not touched by the majority of public resources. 24 winglet plans are evaluated in Computation Fluid Dynamic (CFD) to study the impact of 5 major geometric parameters (span, cant angle, incident angle, twist angle, sweptback angle) on the ΔCD and ΔCm. It is found that for a fixed span, a linear trend line exists between ΔCD and ΔCm for various winglet plans that the ΔCD/ΔBM is the highest. This trend line is defined as the maximum ΔCD achievable at certain ΔBM at a fixed span. With increasing span, the obtainable ΔCD is higher but the ΔCD/ΔBM decreases. The concept of the ΔCD/ΔBM trend line as the drag reduction limit will greatly simplify the optimization process of winglet design.
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Liu, Y., Ouyang, S., Zhao, X. (2019). The Investigation of the Maximum Possible Drag Reduction of the Winglet Under the Limitation of Wing Root Bending Moment. In: Zhang, X. (eds) The Proceedings of the 2018 Asia-Pacific International Symposium on Aerospace Technology (APISAT 2018). APISAT 2018. Lecture Notes in Electrical Engineering, vol 459. Springer, Singapore. https://doi.org/10.1007/978-981-13-3305-7_119
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DOI: https://doi.org/10.1007/978-981-13-3305-7_119
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