Accession Number:

ADP005912

Title:

Survey on Nonlinear Effects,

Descriptive Note:

Corporate Author:

NIELSEN ENGINEERING AND RESEARCH INC MOUNTAIN VIEW CA

Report Date:

1988-04-01

Pagination or Media Count:

103.0

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.

Subject Categories:

  • Guided Missile Dynamics, Configurations and Control Surfaces
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE