Underexpanded Noncondensing Turbulent Gas Jets in Liquids

Abstract

The structure of turbulent noncondensing round and plane air jets submerged in still water were investigated experimentally. Both adapted and underexpanded jets were considered, the latter with underexpansion ratios up to 8:1. Measurements included flow visualization, using flash photography and shadowgraphs as well as high-speed motion-picture photography; mean void fraction distributions, using gamma-ray absorption; entrainment rates, using laser-Doppler aneomometry; and mean static pressures, using static-pressure probes. Present measurements and the earlier results of Bell et al. (1972), Tross (1974) and Carreau et al. (1985) were used to evaluate analysis of the process. The analysis was based on the locally-homogeneous-flow approximation (relative velocities between the phases neglected) and the effective-adapted-jet approximation for underexpanded jets. Keywords: Multiphase flow, Gas jets, Liquids, Compressible turbulent jets.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1988
Accession Number
ADA197939

Entities

People

  • E. Loth
  • Gerard M. Faeth

Organizations

  • University of Michigan

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Boundary Layer
  • Buoyancy
  • Computational Fluid Dynamics
  • Flow Visualization
  • Fluid Dynamics
  • Fluid Flow
  • Hydrodynamics
  • Measurement
  • Mechanical Properties
  • Mixing
  • Physics Laboratories
  • Pressure Distribution
  • Pressure Gages
  • Pressure Measurement
  • Reynolds Number
  • Turbulent Mixing
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Combustion and Flow Dynamics.
  • Fluid Mechanics and Fluid Dynamics.

Technology Areas

  • Directed Energy