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title非平面翼の最適設計-揚力と翼根曲げモーメントを与えた時の最小誘導抵抗-
Other TitleOptimum Design of Nonplanar wings-Minimum Induced Drag for A Given Lift and Wing Root Bending Moment
Author(jpn)浅井, 圭介
Author(eng)ASAI, Keisuke
Author Affiliation(jpn)航空宇宙技術研究所空気力学第二部
Author Affiliation(eng)Second Aerodynamics Division, National Aerospace Laboratory(NAL)
Issue Date1984
PublisherNational Aerospace Laboratory(NAL)
航空宇宙技術研究所
Publication title航空宇宙技術研究所報告 = TECHNICAL REPORT OF NATIONAL AEROSPACE LABORATORY TR-797
Start page21
Publication date1984-01
Languagejpn
DescriptionThe objective of the present paper is to discuss the application of nonplanar wings such as Whitcomb’s winglet to new subsonic transport airplanes. A simple numerical method has been developed to calculate the minimum induced drag for a wing of an arbitrary nonplanar configuration, using the Trefftz-plane(far-field) analysis and the Lagrangean multiplier technique. For a series of wing/winglet combinations and several more complex forms such as curved wings, the value of the induced drag efficiency parameter‘l/e’is evaluated and compared with that of a conventional planar wing. When comparing the induced drag benefits, it is assumed that both wings have the same‘extended’wing planform rather than the‘projected’one. And, to take account of the trade-offs between wing aerodynamic efficiency and wing structural weight, the wing root bending moment as well as the wing total lift are kept constant. With these constraints, the drag performances for both wings could be compared without any ambiguity associated with structural weight and wing surface skin friction. The results obtained show that the minimum induced drag of every nonplanar wing analyzed here is not less than that of a planar wing except in the case of relatively small values of restricted wing root bending moment. Thus, it is concluded that a planar wing is superior to a nonplanar wing from the view point of cruise drag performance.
Document TypeTechnical Report
JAXA Category航空宇宙技術研究所
ISSN0389-4010
SHI-NONALTR0797000
Report NoNAL TR-797
URIhttps://repository.exst.jaxa.jp/dspace/handle/a-is/25757


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