Accession Number:

AD0267036

Title:

THEORETICAL AND EXPERIMENTAL STUDIES ON AIRLOADS RELATED TO HYPERSONIC AEROELASTIC PROBLEMS OF GENERAL SLENDER POINTED CONFIGURATIONS

Descriptive Note:

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE AEROELASTIC AND STRUCTURES RESEARCH LAB

Personal Author(s):

Report Date:

1961-04-01

Pagination or Media Count:

1.0

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. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE