Accession Number : ADP005912

Title :   Survey on Nonlinear Effects,

Corporate Author : NIELSEN ENGINEERING AND RESEARCH INC MOUNTAIN VIEW CA

Personal Author(s) : Dillenius, Marnix F. ; Perkins, Stanley C., Jr

Report Date : APR 1988

Pagination or Media Count : 103

Abstract : This lecture describes a survey of experimental observations and intermediate level prediction methods aimed at nonlinear aerodynamic characteristics of tactical missiles. A description is given of the major differences between missile and aircraft flight and configuration characteristics. The importance of vortical interference and nonlinear compressibility due to shocks is stressed. Nonlinearities associated with deformable fin design, supersonic fin on body interference, wraparound fins, and unsteady flight are discussed. Summarized accounts are provided of the effects of asymmetric body vortex shedding and vortex bursting on overall missile aerodynamic characteristics. Physical examples are given that show vortex structures and shock formations in vapor screen and schlieren pictures. In many instances, the nonlinear aerodynamic effects are illustrated by theoretical results obtained with and without the relevant nonlinearity. Short descriptions are given of intermediate level panel-based missile aerodynamics prediction methods with special attention to the models incorporated to account for vortical and nonlinear compressibility effects. The descriptions include applications to additive force analysis for supersonic inlets and to deformable fins. Additional comparisons with experimental data are provided and the nonlinear effects pointed out. Presently available methods and future needs are summarized.

Descriptors :   *GUIDED MISSILES, *AERODYNAMIC CONFIGURATIONS, GUIDED MISSILE COMPONENTS, AERODYNAMIC CHARACTERISTICS, MATHEMATICAL PREDICTION, VORTICES, INTERFERENCE, NONLINEAR SYSTEMS, SHOCK, COMPRESSIBLE FLOW, FINS, VORTEX SHEDDING, ASYMMETRY, SUPERSONIC INLETS, DEFORMATION, COMPRESSIVE PROPERTIES, FLOW VISUALIZATION, TACTICAL WEAPONS.

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

Distribution Statement : APPROVED FOR PUBLIC RELEASE