Experimental investigation of wing-in-ground effect with a NACA6409 section |
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Authors: | Kwang Hyo Jung Ho Hwan Chun Hee Jung Kim |
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Institution: | (1) Department of Naval Architecture and Ocean Engineering, Dong-Eui University, Pusan, Korea;(2) Department of Naval Architecture and Ocean Engineering, Pusan National University, Pusan, Korea |
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Abstract: | The aerodynamic characteristics of NACA6409 in the vicinity of the ground were experimentally studied in a wind tunnel. Lift
and drag forces, the pitching moment, and the center of pressure were measured with respect to various major aerodynamic parameters,
such as the ground clearance, the angle of attack, the aspect ratio (AR), and the endplate type, which resulted in a total
number of 420 conditions. In addition, a smoke trace test was conducted to visualize the flow pattern around NACA6409 in the
vicinity of the ground. As a result of the ground effect and the influence of the endplate, the lift-to-drag ratio increased
at low ground clearance and the center of pressure moved forward to the leading edge; that is, the endplate and ground effects
were equivalent to the aerodynamic advantage that results from increasing the AR of the wing. Extended experimental results
are useful for understanding the aerodynamic characteristics influenced by each aerodynamic parameter during ground effect
as well as for verifying numerical simulation. |
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Keywords: | Wing-in-ground effect NACA6409 Endplate Tip vortex Lift-to-drag ratio Center of pressure |
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