Publisher : The Korean Society for Aeronautical & Space Sciences
DOI : 10.5139/IJASS.2003.4.1.063
Title & Authors
Visualization and Flowfield Measurements of the Vortical Flow over a Double-Delta Wing Sohn, Myong-Hwan; Jang, Young-IL;
The vortical flow of a 65-deg flat plate delta wing with a leading edge extension(LEX) was examined through off-surface visualization, 5-hole probe and hot-film measurements. The off-surface flow visualization technique used micro water droplets generated by a home-style ultrasonic humidifier and a laser beam sheet. The angles of attack ranged from 10 to 30 degrees, and the sideslip angles ranged from 0 to -15 degrees. The Reynolds number was for the flow visualization, and for the 5-hole probe and hot-film measurements. The comparison of the visualization photos and the flow field measurement showed that the two results were in a good agreement for the relative position and the structure of the wing and LEX vortices, even though the flow Reynolds numbers of the two results were much different. The wing vortex and the LEX vortex coil each other while maintaining a comparable strength and identity at zero sideslip. Neither a looping of the wing vortex around the strake vortex, nor the lopsided coiling of the stronger strake and the weaker wing vortices was observed. At non-zero sideslip, the downward movement of the LEX vortex when going downstream was enhanced on the windward side, and the downward and inboard movement of the LEX vortex when going downstream was suppressed on the leeward side. The counterclockwise coiling of the wing and LEX vortices was decreased significantly on the leeward side.
off-surface visualization;5-hole probe;wing vortex;LEX vortex;sideslip;coiling of vortices;
Olsen, P. E., and Nelson, R. C., "Vortex Interaction over Double Delta Wings at High Angles of Attack," AIAA Paper 89-2191, July 1989.
Grismer, D. S. and Nelson, R. C., "Double-Delta-Wing Aerodynamics for Pitching Motions With and Without Sideslip," J. of Aircraft, Vol. 32, No. 6, 1995, pp. 1303-1311.
Hebbar, S. K., Platzer, M. F., and Chang, W., "Control of High-Incidence Vortical Flow on Double-Delta Wings Undergoing Sideslip", J. of Aircraft, Vol. 34, No. 4, 1997, pp. 506-513.
Sohn, M. H. and Lee, K Y., "Experimental Investigation of Vortex Flow of a Yawed Delta Wing Having Leading Edge Extension", AIAA Paper 2002-3267, June 2002.
Hoeijmakers, H. W. M., Vaatstra, W., and Verhaagen, N. G., "Vortex Flow Over Delta and Double-Delta Wings", J. of Aircraft, Vol. 20, No. 9, 1983, pp. 825-832.
Cunningham, A. M. and den Boer, R. G., "Low-Speed Unsteady Aerodynamics of a Pitching Straked Wing at High Incidence-Part II: Harmonic Analysis", J. of Aircraft, Vol. 27, No. 1, 1990, pp. 31-41.
Ericsson, L. E., "Vortex Characteristics of Pitching Double-Delta Wings", J. of Aircraft, Vol. 36, No. 2, 1999, pp. 349-356.
Erickson, G. E., Schreiner, J. A., and Rogers, L. W., "On the Structure, Interaction, and Breakdown Characteristics of Slender Wing Vortices at Subsonic, Transonic, and Supersonic Speeds," AIAA Paper 89-3345, August 1989.
Cunningham, A .M., Jr. and den Boer, R. G., "Steady and Unsteady Aerodynamics of a Pitching Straked Wing Model at High Angles of Attack", AGARD CP-494, Oct. 1990 (paper 29).
Sohn, M. H. and Lee, K. Y., "Effects of Sideslip on the High-Incidence Vortical Flow of a Delta Wing with the Leading Edge Extension", AIAA Paper 2003-1107, January 2003.