TY - GEN
T1 - Influence of the curved ground surface on the lift of flat plate airfoil
AU - Chen, Shishi
AU - Xiong, Fenfen
AU - Frolov, Vladimir A.
AU - Li, Keyong
PY - 2012
Y1 - 2012
N2 - At present, only the flat ground surface problem is investigated in most studies on ground effect, which is not effective for practical applications due to the universal existence of curved ground surface. In this paper, the lift calculation of a two-dimensional flat plate airfoil placed near a curved ground surface is investigated. In order to calculate the complex velocity in the flow field, the complex variable function theory is employed. The conformal mapping method is applied to transform the flat plate airfoil to a cylinder in the uniform flow. Moreover, the discrete vortices method is modified to convert the curved ground surface to a series of discrete boundary elements. Two kinds of curved ground surfaces are considered: semicylindrical hollows and semicylindrical hills. It is shown that the lift fluctuation of flat plate airfoil located near a hollow or a hill is considerably serious, which should be considered during the design of flight vehicles flying near the ground surface.
AB - At present, only the flat ground surface problem is investigated in most studies on ground effect, which is not effective for practical applications due to the universal existence of curved ground surface. In this paper, the lift calculation of a two-dimensional flat plate airfoil placed near a curved ground surface is investigated. In order to calculate the complex velocity in the flow field, the complex variable function theory is employed. The conformal mapping method is applied to transform the flat plate airfoil to a cylinder in the uniform flow. Moreover, the discrete vortices method is modified to convert the curved ground surface to a series of discrete boundary elements. Two kinds of curved ground surfaces are considered: semicylindrical hollows and semicylindrical hills. It is shown that the lift fluctuation of flat plate airfoil located near a hollow or a hill is considerably serious, which should be considered during the design of flight vehicles flying near the ground surface.
KW - Complex variable function
KW - Conformal mapping
KW - Curved ground surface
KW - Discrete vortices
KW - Ground effect
UR - http://www.scopus.com/inward/record.url?scp=84871532074&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/AMM.232.261
DO - 10.4028/www.scientific.net/AMM.232.261
M3 - Conference contribution
AN - SCOPUS:84871532074
SN - 9783037855140
T3 - Applied Mechanics and Materials
SP - 261
EP - 266
BT - Mechanical and Aerospace Engineering
T2 - 2012 3rd International Conference on Mechanical and Aerospace Engineering, ICMAE 2012
Y2 - 7 July 2012 through 8 July 2012
ER -