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- W658532507 abstract "Current approaches to the prediction of unsteady wing loading in mixed subsonic and supersonic flow show a wide variety of method and a clear need for economy in transonic aerodynamic calculations for flutter clearance in subsonic flight. An approximate theoretical treatment is devised in terms of nonlinear steady surf ace pressures and linear oscillatory loading. The steady data are taken either from transonic small-perturbation theory or from static measurements of surf ace pressure. The resulting theoretical or semi-empirical method can take account of stream Mach number, mean incidence, mode of oscillation, frequency and amplitude. The calculations are organized into a computer program, the scope and broad details of which are outlined. lts first application is in support of a wind-tunnel study of a rigid half-wing with freedom to rotate about a swept axis. The experiment provides measurements of steady and oscillatory pressure distributions over the range of Mach number from 0.60 to 0.86. The oscillatory results are compared with calculations from linearized theory and from the present method in its theoretical and semi-empirical forms. Like the dynamic experiments, the calculations show large differences between oscillatory chordwise load distributions under subcritical and supercritical conditions. In particular, the region surrounding a shockwave exhibits large and rapid changes in both amplitude and phase of the measured loading, which are reproduced qualitatively in the calculations. The resulting generalized aerodynamic forces are found to dep end significantlyon the development of supercritical flow. The method should provide an economical indication of the influence of mean flow on the flutter aerodynamics in the lower transonic regime. Finally there is a forward-Iooking appraisal of the method, which pinpoints the evidence of a part icular need for improvement. The effects of boundary layers are considered to be important in future work on flutter aerodynamics. There should be a concerted plan to compare results from unsteady threedimensional transonic theories as they are developed." @default.
- W658532507 created "2016-06-24" @default.
- W658532507 creator A5034506055 @default.
- W658532507 date "1977-01-31" @default.
- W658532507 modified "2023-09-28" @default.
- W658532507 title "A practical framework for the evaluation of oscillatory aerodynamic loading on wings in supercritical flow" @default.
- W658532507 hasPublicationYear "1977" @default.
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