Demonstration of a Strategy to Perform Two-Dimensional Diode Laser Tomography

Abstract

Demonstration of a strategy to perform two-dimensional diode laser tomography using a prior knowledge from symmetry arguments and computational fluid dynamic (CFD) calculations is presented for a flat flame burner. The strategy uses an optimization technique to determine flame diameter and location using a vector quantization approach. Next, the variance in a training set, produced from CFD calculations, is captured using principal components analysis. The information in the training set allows interpolation between beam paths resulting in temperature and density maps. Finally, the TDLAS temperature and density maps are shown to agree with traditional thermocouple measurements of the flat flame burner to within five percent. Preliminary tomography results using the same strategy are then presented for a super-sonic flow through an isolator, a length of wind tunnel necessary to keep the shock wave produced by the combustor from reaching the inlet.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 2008
Accession Number
ADA483259

Entities

People

  • Ryan N. Givens

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Absorption Coefficients
  • Absorption Spectra
  • Air Force
  • Angular Momentum
  • Combustion
  • Computational Fluid Dynamics
  • Computational Science
  • Detectors
  • Geometry
  • Heat Transfer
  • Laser Diodes
  • Laser Induced Fluorescence
  • Lasers
  • Spreadsheet Software
  • Total Angular Momentum
  • Two Dimensional
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Combustion science or combustion engineering.
  • Computational Fluid Dynamics (CFD)
  • Wave Propagation and Nonlinear Chaotic Dynamics.

Technology Areas

  • Directed Energy