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Theoretical And Experimental Studies On Airloads Related To Hypersonic Aeroelastic Problems Of General Slender Pointed Configurations

Report Number: ASD TR 61-7
Author(s): Zartarian, Garabed; Tan Hsu,Pao
Corporate Author: Massachusetts Inst Of Tech Cambridge Aeroelastic And Structures Research Lab
Laboratory: Flight Dynamics Laboratory
Date of Publication: 1961-04
Pages: 145
Contract: AF 33(616)-5651
Project: 1370
Task: 13478
AD Number: AD0267036

Abstract:
Two approximate techniques for e timating inviscid hypersonic airloads on pointed slender configurations, originally developed for airfoil and bodies of revolution are extended to cover other cross-sectional shapes. The first, an unsteady shock-expansion method, is illustrated by application to two ogives ith earlyelliptic, similar cross sections. A a check, tical analysis, Differential equations, Integral equations.) (*Wings, *Flutter, Mathematical analysis.) Two approximate techniques for e timating inviscid hypersonic airloads on pointed slender configurations, originally developed for airfoil and bodies of revolution are extended to cover other cross-sectional shapes. The first, an unsteady shock-expansion method, is illustrated by application to two ogives ith earlyelliptic, similar cross sections. A a check, steady-flow pressure and total lateral force were measured on two such models, one with a straight and the other with a cambered body axis, in the range of the hypersonic parameter 1.1 less than or equal to K less than or equal to 1.75. Experimental pressures are substantially higher than the predicted ones, although the shapes of the circumferential distributions are in goo agreem nt. The second technique, a variationalRitz procedure valid for lower values of the hypersonic parameter, is applied to a cone and an ogive, both with faired triangular cross sections, following a suitable transformation. Included is a preliminary investigation of the effects of aerodynamic nonlinearity, arising from largeamplitude oscillations, on the flutter characteristics of a typical wing section.

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