TY - JOUR
T1 - Wing in ground effect characteristics of circular-arc aerofoils for aero-train
AU - Ishizuka, Tomoyuki
AU - Kohama, Yasuaki
AU - Katoh, Takuma
AU - Kikuchi, Satoshi
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2004/5
Y1 - 2004/5
N2 - In this paper, the aerodynamic characteristics of a symmetrical ground effect wing are measured in a low turbulance wind tunnel. To change the directions of an Aero-Train in practical use, it must shuttle back and forth. Circular-arc aerofoil seems to be suitable for the Aero-train, while it can run back and forth by changing only the attack angle of wings. Lift and drag characteristics of NACA 6412-modified, circular-arc aerofoils with thickness ratio 9% and 12% were clarified by the 6-component balance. Suction and moving-belt system were used to simulate the ground. Characteristics of two-dimensional aerofoils and three-dimensional wings were compared, and lift-to-drag rations of three aerofoils were compared. Separations on the upper surface of the circular-arc aerofoils were visualized by tuft and oil spot method. It was found that increase of drag in ground effect condition was caused by increase of the induced drag and by enlargement of the separation area on upper surface of circular-arc aerofoils. A circular-arc aerofoil with thickness ratio 9% at the angle of attuck 2 degrees had enough lift-to-drag ratio for Aero-Train.
AB - In this paper, the aerodynamic characteristics of a symmetrical ground effect wing are measured in a low turbulance wind tunnel. To change the directions of an Aero-Train in practical use, it must shuttle back and forth. Circular-arc aerofoil seems to be suitable for the Aero-train, while it can run back and forth by changing only the attack angle of wings. Lift and drag characteristics of NACA 6412-modified, circular-arc aerofoils with thickness ratio 9% and 12% were clarified by the 6-component balance. Suction and moving-belt system were used to simulate the ground. Characteristics of two-dimensional aerofoils and three-dimensional wings were compared, and lift-to-drag rations of three aerofoils were compared. Separations on the upper surface of the circular-arc aerofoils were visualized by tuft and oil spot method. It was found that increase of drag in ground effect condition was caused by increase of the induced drag and by enlargement of the separation area on upper surface of circular-arc aerofoils. A circular-arc aerofoil with thickness ratio 9% at the angle of attuck 2 degrees had enough lift-to-drag ratio for Aero-Train.
KW - Aero-Train
KW - Circular-Arc Aerofoils
KW - Flow Visualization
KW - Fluid Force
KW - Lift-to-Drag Ratio
KW - Separation
KW - Wing in Ground Effect
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U2 - 10.1299/kikaib.70.1179
DO - 10.1299/kikaib.70.1179
M3 - Article
AN - SCOPUS:3242758141
VL - 70
SP - 1179
EP - 1185
JO - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
JF - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
SN - 0387-5016
IS - 693
ER -