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Related Experiment Videos

Quantitative rainbow schlieren deflectometry as a temperature diagnostic for nonsooting spherical flames.

Douglas A Feikema1

  • 1National Aeronautics and Space Administration, Glenn Research Center at Lewis Field, Cleveland, Ohio 44135, USA. douglas.feikema@grc.nasa.gov

Applied Optics
|June 30, 2006
PubMed
Summary

This study presents a quantitative method for measuring temperature distribution in microgravity spherical diffusion flames using rainbow schlieren deflectometry. The technique is suitable for designing optical systems to analyze flame behavior.

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Area of Science:

  • Fluid dynamics
  • Combustion science
  • Optical physics

Background:

  • Quantitative temperature measurement in microgravity flames is crucial for understanding combustion phenomena.
  • Rainbow schlieren deflectometry offers a non-intrusive optical method for flow visualization and analysis.

Purpose of the Study:

  • To define a method for quantitatively measuring the temperature distribution of spherical diffusion flames in microgravity.
  • To illustrate the preliminary design steps for a rainbow schlieren system for microgravity applications.

Main Methods:

  • Utilized numerical analysis and experimental results to develop the measurement technique.
  • Employed rainbow schlieren deflectometry with specific optical configurations for deflection measurement.
  • Focused on spherical diffusion flames in a microgravity environment.

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Main Results:

  • Successfully defined a method for quantitative temperature measurement.
  • Demonstrated the feasibility of the rainbow schlieren technique for microgravity flames.
  • Determined the largest deflection for a normal gravity flame to be 7.4 x 10(-4) rad.
  • Achieved an experimental uncertainty of deflection measurement below 5 x 10(-5) rad.

Conclusions:

  • The presented method is effective for quantitative temperature mapping of microgravity flames.
  • The study provides a foundation for the design and implementation of rainbow schlieren systems in microgravity research.
  • Accurate deflection measurements are achievable with appropriate optical setups.