Experiments on the aerodynamics of a cambered airfoil in ground effect

M. R. Ahmed, T. Takasaki, Y. Kohama

研究成果: Conference contribution

7 被引用数 (Scopus)

抄録

The flow characteristics over a NACA4412 airfoil are studied in a low turbulence wind tunnel with moving ground simulation at a Reynolds number of 3.0 × 105 by varying the angle of attack from 0° to 10° and ground clearance of the trailing edge from five percent of chord to hundred percent. The pressure distribution on the airfoil surface was obtained, velocity survey over the surface was performed, wake region was explored, and lift and drag forces were measured. To ensure that the flow is 2-D, PIV measurements were performed. A strong suction effect on the lower surface at an angle of attack of 0° at the smallest ground clearance caused laminar separation well ahead of the trailing edge. Interestingly, for this airfoil, a loss of upper surface suction was recorded as the airfoil approached the ground for all angles of attack. For angles up to 4°, the lift decreased with reducing ground clearance, while for higher angles, it increased due to higher pressure on the lower surface. The drag was higher close to the ground for all angles investigated mainly due to the modification of the lower surface pressure distribution.

本文言語English
ホスト出版物のタイトルCollection of Technical Papers - 44th AIAA Aerospace Sciences Meeting
出版社American Institute of Aeronautics and Astronautics Inc.
ページ3132-3148
ページ数17
ISBN(印刷版)1563478072, 9781563478079
DOI
出版ステータスPublished - 2006
外部発表はい
イベント44th AIAA Aerospace Sciences Meeting 2006 - Reno, NV, United States
継続期間: 2006 1月 92006 1月 12

出版物シリーズ

名前Collection of Technical Papers - 44th AIAA Aerospace Sciences Meeting
5

Other

Other44th AIAA Aerospace Sciences Meeting 2006
国/地域United States
CityReno, NV
Period06/1/906/1/12

ASJC Scopus subject areas

  • 宇宙惑星科学
  • 航空宇宙工学

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