Retrieval of Flow-Field Gas Temperature and Concentration in Low-Visibility Propellant Rocket Exhaust Plumes

Abstract

Estimates have been obtained for the maximum loading level of particles in two-phase rocket exhaust plumes that still allows a reliable determination of flow-field temperature and active gas distribution using gas- only plume retrieval diagnostics. Spatial profiles of emission and absorption transverse to the plume axis and close to the nozzle exit plane were computed for various plume models using a single-scattering band model that correctly couples gas and particle radiation. Retrieval of radial gas temperature and concentration profiles from these transverse profiles were performed with an iterative Abel inversion algorithm designed for purely gaseous plumes. The retrieved profiles were compared with the model profiles to determine the error introduced by ignoring particle effects in inversion. A first-order method for accounting for particle effects was also examined. Results are presented for modeled tactical rocket plumes for candidate low-visibility propellants containing Al2O3/H2O, Carbon/HCL and ZrO2/H2O as the particulate/gas pairs.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1982
Accession Number
ADB064202

Entities

People

  • Stephen J. Young

Organizations

  • The Aerospace Corporation

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Absorption
  • Air Force
  • Aluminum Oxides
  • Electromagnetic Scattering
  • Exhaust Plumes
  • Flow Fields
  • Lepidoptera
  • Optical Properties
  • Particle Size
  • Particles
  • Propellants
  • Radiation
  • Radiative Transfer
  • Refractive Index
  • Rocket Exhaust
  • Scattering
  • Test And Evaluation

Fields of Study

  • Environmental science
  • Physics

Readers

  • Combustion and Flow Dynamics.
  • Rocket Propulsion.
  • Spectroscopy.