Moment Induced by Liquid Payload during Spin-Up Without a Critical Layer.

Abstract

For a fully spun-up liquid payload, eigenfrequencies and liquid side moments induced by projectile coning motion have been computed by a linear boundary layer theory. For partially spun-up liquids, this theory can fail due to the presence of a critical layer in which the local angular velocity of the spinning motion is near the angular velocity of the projectile's coning motion. Late in the spin-up process, when more than 90% of the spin angular momentum has been acquired by the liquid, a critical layer usually does not exist. In this report, a linear-boundary-layer theory is developed to predict eigenfrequencies and the liquid moment during late spin-up times. The predicted eigenfrequencies agree well with those computed by the linearized Navier-Stokes technique of Gerber and Sedney. The side moments predicted by the linear-boundary-layer theory are available to projectile designers for flight stability analysis.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1984
Accession Number
ADA145716

Entities

People

  • C. H. Murphy

Organizations

  • Ballistic Research Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Aeronautics
  • Aircrafts
  • Angular Momentum
  • Boundary Layer
  • Computational Fluid Dynamics
  • Computational Science
  • Differential Equations
  • Eigenvalues
  • Engineering
  • Equations
  • Fluid Mechanics
  • Jet Propulsion
  • Mechanics
  • Physics Laboratories
  • Reynolds Number
  • Steady State
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Fluid Dynamics.