Accession Number : AD0831747

Title :   UNSTEADY AERODYNAMIC FORCES FOR GENERAL WING/CONTROL-SURFACE CONFIGURATIONS IN SUBSONIC FLOW PART I-THEORETICAL DEVELOPMENT,

Corporate Author : GRUMMAN AIRCRAFT ENGINEERING CORP BETHPAGE NY ADVANCED DEVELOPMENT PROGRAM

Personal Author(s) : Berman, J. H. ; Shyprykevich, P. ; Smedfjeld, J. B.

Report Date : DEC 1967

Pagination or Media Count : 78

Abstract : A kernel-function procedure is presented for the prediction of subsonic oscillatory pressure distributions on finite-aspect-ratio wings with partial-span control surfaces. The basic wing pressure-series functions used in previous kernel-function applications are augmented in this report to include the logarithmic singularity at the control-surface leading edge, and to account for gap effects at the control-surface side edges. The procedure employs either a conventional planar kernel function or, on an optional basis, a non-planar kernel function which considers the effect of an initially deflected control surface. The solution for the unknown coefficients of the pressure-series functions is performed in a least-squares sense based on downwash values at locations chosen by the program user. The final results obtained are in the form of pressure distributions and generalized forces. Finally, a limited correlation of program calculations with available experimental data is presented. (Author)

Descriptors :   (*AERODYNAMIC CONTROL SURFACES, SUBSONIC CHARACTERISTICS), MATHEMATICAL PREDICTION, AIRFOILS, ASPECT RATIO, OSCILLATION, LIFT, DOWNWASH, TWO DIMENSIONAL FLOW, NUMERICAL INTEGRATION, MOMENTS, LEADING EDGES, AERODYNAMIC CHARACTERISTICS, EQUATIONS, BESSEL FUNCTIONS, CORRELATION TECHNIQUES, NUMERICAL METHODS AND PROCEDURES, MATRICES(MATHEMATICS), AERODYNAMIC LOADING.

Subject Categories : Statistics and Probability
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE