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research-article

Ground effect on the vortex flow and aerodynamics of a slender delta wing

[+] Author and Article Information
Timothy Lee

Department of Mechanical Engineering, McGill University, Montreal, Quebec, Canada
Tim.Lee@McGill.ca

Lok Sun Ko

Department of Mechanical Engineering, McGill University, Montreal, Quebec, Canada
lok.ko@mail.mcgill.ca

1Corresponding author.

ASME doi:10.1115/1.4039232 History: Received September 10, 2017; Revised December 30, 2017

Abstract

The ground effect on the aerodynamic loading and leading-edge vortex flow generated by a slender delta wing was investigated experimentally. Both the lift and drag forces were found to increase with reducing ground distance (up to 50% of the wing chord). The lift increment was also found to be the greatest at low angles of attack ? and decreased rapidly with increasing ground distance and ?. The ground effect-caused earlier wing stall was also accompanied by a strengthened leading-edge vortex with an increased rotational speed and size compared to the baseline wing. The smaller the ground distance the stronger the leading-edge vortex and the earlier vortex breakdown became. Meanwhile, the vortex trajectory was also found to be located further inboard and above the delta wing in ground effect compared to its baseline-wing counterpart. Finally, for WIG (wing-in-ground effect) craft with delta-wing planform the most effective in-ground-effect flight should be kept within 10% of the wing chord.

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