A new technique for investigating the induced and profile drag coefficients of a smooth wing and a tubercled wing
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(Published Version)
Date
2016
Authors
Bolzon, M.
Kelso, R.
Arjomandi, M.
Editors
Dančová, P.
Veselý, M.
Veselý, M.
Advisors
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Conference paper
Citation
EPJ Web of Conferences, 2016 / Dančová, P., Veselý, M. (ed./s), vol.114, pp.1-8
Statement of Responsibility
Michael Bolzon, Richard Kelso, and Maziar Arjomandi
Conference Name
Experimental Fluid Mechanics Conference, EFM15 (17 Nov 2015 - 20 Nov 2015 : Prague)
Abstract
The induced and profile drag coefficients of a wing are typically determined through a complex experimental technique, such as wake surveying. Such a technique requires measurement of all three orthogonal components of the downstream velocity to find the components of drag, which results in the necessary usage of a sophisticated and costly measurement device, such as multi-hole pressure probe. However, in this paper data is presented which demonstrate that the relative changes in the induced and profile drag coefficients can largely be determined through the sole measurement of the downstream, streamwise velocity. To demonstrate this, the induced and profile drags of two NACA 0021 wings, one with a smooth leading edge and the other wing a tubercled leading edge for comparison, are determined through the measurement of the three orthogonal velocities. The downstream, streamwise velocity distribution of each wing is then constructed and relationships can be determined. The wings were surveyed at 3°, 9°, and 12°. It has been found that the relative magnitude of the profile drag coefficient can be found for all considered angles of attack, while the relative magnitude of the induced drag coefficient can be found at 9° and 12°. These findings produce an innovative, simpler, and more cost effective experimental technique in determining the components of drag of a wing, and reduces the burdensome requirement of a sophisticated measurement device for such an experiment. Further investigation is required to determine the induced drag at 3°.
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© Owned by the authors, published by EDP Sciences, 2016. This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.