Accession Number : ADP005913

Title :   Semi-Empirical Methods for Conventional and Unconventional Missiles,

Corporate Author : PRC KENTRON HAMPTON VA

Personal Author(s) : Hemsch, Michael J.

Report Date : APR 1988

Pagination or Media Count : 21

Abstract : 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.

Descriptors :   *GUIDED MISSILES, *SLENDER BODIES, AERODYNAMIC CONFIGURATIONS, AERODYNAMIC CHARACTERISTICS, MATHEMATICAL PREDICTION, CORRELATION, HIGH ANGLES, ANGLE OF ATTACK, SUPERSONIC FLOW, CROSS FLOW, FLOW FIELDS, NONLINEAR ANALYSIS, GUIDED MISSILE COMPONENTS, WINGS.

Subject Categories : Guided Missile Dynam, Config & Cntrl Surfaces
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE