An Experimental and Numerical Study of IR Emission from a Porous Radiant Burner

Abstract

An experimental analysis and computational modelling of thermal radiation from an INCONEL601 wire-mesh porous burner has been conducted. It has been found that within a bandwidth between 2 micrometers and 20 micrometers, the infrared radiation in the 2-5 micrometers waveband is the dominant band. Optimal operating conditions, as determined by the surface temperature and radiant intensity, are a function of the equivalence ratio and the firing rate. The location of the flame front is also influenced by these parameters. For fuel-rich mixtures the flame is usually located above the surface and the flame stability is sensitive to external perturbations. A maximum surface temperature of approximately 1223K, and a radiation intensity of 50 W/Sr, has been measured. It has also been shown that INCONEL601, despite its high emissivity, can be used as an effective radiation shield. By placing a piece of the wire-mesh in front of burning MTV pyrotechnic composition, the infrared radiation was significantly reduced. The equivalent black body temperature of MTV was cut from ^1900 deg C without a shield to ^1400 deg C with a shield adjacent to the mixture. A comparison between the ChemRad model predictions and measured surface temperature for various equivalence ratios has shown a reasonable agreement with a maximum discrepancy of 16% for fuel-rich mixtures. However, within optimal operating conditions of the burner (equivalence ratio 0.8-1) a maximum difference of 8% has been observed. Accounting for the variability in the measurements, the number of simplifying assumptions and the uncertainty in some values of the physical and optical properties, the accurac and consistenc of the model, as a first-order approximation is acceptable.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 2001
Accession Number
ADA393145

Entities

People

  • Farid C. Christo
  • Lakshmanan V. Krishnamoorthy

Organizations

  • Defence Science and Technology Group

Tags

Communities of Interest

  • Energy and Power Technologies
  • Ground and Sea Platforms
  • Sensors
  • Weapons Technologies

DTIC Thesaurus Topics

  • Accuracy
  • Chemical Reactions
  • Chemistry
  • Combustion
  • Computational Science
  • Detectors
  • Emissivity
  • Engineering
  • Engineers
  • Firing Rate
  • Measurement
  • Mechanical Engineering
  • Optical Properties
  • Physical Properties
  • Propulsion Systems
  • Radiant Intensity
  • Surface Temperature

Fields of Study

  • Physics

Readers

  • Rocket Propulsion.
  • Spectroscopy.
  • Thermal Physics or Thermal Science.