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Aerodynamics of Tactical Weapons to Mach Number 8 and Angle of Attack 180 deg. Part 1. Theory and Application.

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Final rept.,

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An existing methodology for predicting static and aerodynamic coefficients was extended to higher angles of attack and Mach numbers. Improvements in existing computational methods were also made. The theory is applicable to bodies of revolution with one or two, piecewise similar-cross section lifting surfaces 2 or 4 number. The original methodology was applicable to a Mach number of 3 and to an angle of attack of 15 deg. The capability for dynamic derivative prediction for small angles was extended and improved to Mach numbers of the order 6, above which real gas effects and much stronger viscous coupling are important. Static aerodynamic prediction capability at small angles of attack was extended and improved to M sub infinity 6, and empirical code developed for the Army by G. Aiello of the Martin-Marietta Corp. Orlando was adapted for prediction of static aerodynamics at higher angles of attack for a limited configurational envelope. The Martin-Marietta code predicts body-tail aerodynamics for arbitrary roll orientation and angles of attack to 45 deg for 0.8 M sub infinity 3. Body-alone and wing-alongin the presence of the body components can be computer to alpha 180 deg and for 0.8 M sub infinity 3. New individual computational methods are evaluated by comparison with other computational methods and experimental data. The resulting extended computer program was segmented in order to conserve storage locations. Computational times depending on Mach number, configuration, and program option range from under a second to a minute per Mach number on the CDC 6700 computer.

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  • Aerodynamics

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