Winglets on low aspect ratio wings

Kuhlman, John M.; Liaw, Paul

doi:10.2514/6.1987-2482

Cited by 1 publication

(2 citation statements)

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“…The efficiency factor k is defined as the ratio of induced drag coefficient for an elliptically loaded planar wing to the induced drag coefficient of the optimal nonplanar wing/winglet configuration having an equal projected span at equal lift coefficient. The present method is compared with the results of [8] in Fig. 5, where a slightly higher efficiency is found, possibly due to a finer mesh in the present calculation.…”

Section: Wing and Wingletsmentioning

confidence: 97%

“…The efficiency of vertical winglets has been estimated by Kuhlman et al [8] and Lundry et al [9], from analyses in the Trefftz plane. The efficiency factor k is defined as the ratio of induced drag coefficient for an elliptically loaded planar wing to the induced drag coefficient of the optimal nonplanar wing/winglet configuration having an equal projected span at equal lift coefficient.…”

Section: Wing and Wingletsmentioning

confidence: 99%

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Analysis and Design of Wings and Wing/Winglet Combinations at Low Speeds

Chattot

2004

42nd AIAA Aerospace Sciences Meeting and Exhibit

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Numerical treatment in Prandtl lifting-line theory of the nonlinearity associated with a 2-D lift curve, when the local incidence is larger than the incidence of maximum lift, is proposed. It is shown that the use of an artificial viscosity term makes the solution unique and allows the iterative method to converge to a physically meaningful solution, that is in agreement with the exact solution for the test case. The design and analysis of winglets is presented. The winglets considered are small fences placed upward at the tip of the wing to improve the wing efficiency by decreasing the induced drag. The effect of yaw on a wing equipped with such optimal winglets indicates that they provide weathercock stability.

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Section: Wing and Wingletsmentioning

confidence: 97%

Section: Wing and Wingletsmentioning

confidence: 99%