Studies of friction drag and pressure drag of airfoils using the Eppler programMost previous studies of the drag and two-dimensional airfoils consider only the total drag. The present report gives results of a study of three airfoils, using the Eppler program, to determine the distribution of friction drag along the chord and to obtain relative values of friction drag and pressure drag over a wide range of angle of attack and Reynolds number. The effects of boundary-layer suction in the turbulent region of the boundary layer of two of the airfoils are also investigated. The pressure drag is found to be an important component of the total drag, reaching values of 60 to 80 percent of the total drag near the stall. The use of suction producing a uniform inflow in the turbulent region of the boundary layer results in large increases in maximum lift, and increases the skin-friction drag but reduces or even changes the sign of the pressure drag.
Document ID
19890063985
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Phillips, William H. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1988
Subject Category
Aerodynamics
Report/Patent Number
SAE PAPER 881396
Meeting Information
Meeting: Aerospace Technology Conference and Exposition