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Spanwise Distribution of Lift and Drag at High Angles of Attack
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English
Abstract
Knowledge of the characteristics of finite span wings operating at high angles of attack is of importance in predicting post-stall performance of high performance aircraft, in studying problems associated with stall and spin departure of aircraft, and in predicting performance of wind turbines.
Experimental studies of reflection plane wings, in the wind tunnel and water tunnel, show that, below the stall, the spanwise distributions of lift and drag agree quite well with classic aerodynamic theory. At angles of attack above the stall, however, lift and drag distributions across the span are considerably different. Experimental results are presented which demonstrate these altered spanwise loadings.
The increase of lift toward the wingtip is partially the result of “side-edge” vortex lift. Use of drooped leading-edge extension cuffs further change the spanwise lift distribution above the wing stall angle. Based on these results, a new wing is being tested to develop a system of lateral control to be effective at angles of attack beyond the stall.
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Citation
Snyder, M., Yong, W., and Ross, G., "Spanwise Distribution of Lift and Drag at High Angles of Attack," SAE Technical Paper 891019, 1989, https://doi.org/10.4271/891019.Also In
References
- Lamar John E. “Extension of Leading-Edge Suction Analogy to Wings with Separated Flow Around the Side Edges at Subsonic Speeds,” NASA TR R-428 1974
- Asay August Snyder M.H. “Predicting Optimal Leading-Edge Extension Length for an NACA 0015 Wing Through Flow Visualization,” IAR 88-111 Institute for Aviation Research, Wichita State University Wichita, Kansas May 1988
- Wang Yong “Experimental Study of Separation Flow Field on NACA 23024 Right Wing,” M.S. thesis Wichita State University Wichita, Kansas July 1988
- Ross George B. “Experimental Measurement of Surface Pressure Distributions on NACA 23024 Wing with Leading-Edge Modifications at High Angles of Attack,” M.S. thesis Wichita State University Wichita, Kansas November 1988