Access Restriction

Author Mekanikal, Jurnal ♦ Yeung, W. W. H.
Source CiteSeerX
Content type Text
File Format PDF
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Lift Enhancement Unconventional Airfoil ♦ Trapped Vortex ♦ Experimental Measurement ♦ Rotating Cylinder ♦ New Wing ♦ Lift Augmentation ♦ Flow Past Unconventional Airfoil ♦ Considerable Lift Enhancement ♦ Lift Enhancement ♦ Vortex Trajectory ♦ Surface Pressure Distribution ♦ Lift Curve ♦ Effective Wing Shape ♦ Critical Task ♦ Surface Discontinuity ♦ Theoretical Study ♦ Multiple Vortex ♦ Upper Surface ♦ Smooth Surface ♦ Vortex Trapping ♦ Wing Model ♦ Flow Visualization Study ♦ Maximum Lift ♦ Leading-edge Rotating Cylinder ♦ Corrugated Airfoil Confirm ♦ Backward-facing Step
Abstract Lift augmentation on airfoils is a critical task to an aerodynamicist when asked to design new wings. Flow visualization studies on a corrugated airfoil confirm that the trapped vortices lead to a modification of the effective wing shape and an increase in lift. Considerable lift enhancement is found in the experimental measurements on a wing model incorporated with a backward-facing step on the upper surface because of a trapped vortex. Furthermore, a leading-edge rotating cylinder (which behaves like a vortex) effectively extend the lift curve of an airfoil without substantially affecting its slope, thus increasing the maximum lift and delaying stall. While theoretical studies of vortex trapping are limited to airfoils with smooth surfaces, this paper explores the ability of trapping single and multiple vortices on airfoils with surface discontinuities, such as cavities, corrugations, or a rotating cylinder. Streamlines, surface pressure distributions and the vortex trajectories are presented in the hope to advance the knowledge on lift enhancement for flow past unconventional airfoils.
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study
Learning Resource Type Article
Publisher Date 2006-01-01