Excrescence drag magnification factors at the drag-rise condition for aerofoils with a specified form of upper-surface pressure distribution.
Abstract:ESDU 91029 provides data for the chordwise variation of the magnification factor on the upper and lower surfaces of a family of aerofoils designed to combine a high drag-rise Mach number with a high lift coefficient for a given thickness/chord ratio. (The geometry and pressure distribution at the design condition are described in ESDU 71020 and profile drag data are given in ESDU 67011.) The data are typical of aerofoils designed for that purpose and were obtained using the program of ESDU 91028. They are presented in tables together with normalised values of local flow properties and boundary layer momentum thickness on both aerofoil surfaces, and also graphically. The influence of systematic variations of thickness/chord ratio, design Mach number, and extent of upper-surface roof top are discussed. A worked example illustrates the use of both the tabulated and graphical data in conjunction with excrescence drag data for grooves in uniform flow from ESDU 75028.
|Data Item ESDU 91029|