Semi-Empirical Methods for Conventional and Unconventional Missiles,
PRC KENTRON HAMPTON VA
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In the development and use of semi-empirical methods for prediction of the aerodynamic characteristics of modern missiles, one fact is exploited more than any other the slenderness of the airframes and of the flows surrounding them. The first mathematical attempts to use this fact made over thirty years ago, resulted in classical slender-body theory and the universally-known Pitts, Nielsen and Kaatari method for conventional missiles. In this lecture, it is shown that invoking slenderness for a missile in supersonic high angle-of-attack flow fields similarity forms which correlate data for affine bodies and wings in a particularly useful way. The equivalent angle-of-attack concept which is rooted in classical slender body theory is also presented together with extensions required for flows with high cross-flow Mach number, one of the similarity variables. Finally, it is shown that the classical two-term fits to normal-force and center-of-pressure-location data for isolated wings and bodies are inferior to one-term power-law fits to the data in similarity form.
- Guided Missile Dynamics, Configurations and Control Surfaces
- Fluid Mechanics