Statistical Interpretation of Power Spectral Densities Measured by Picosecond Time-Resolved Laser-Induced Fluorescence in Turbulent Nonpremixed Flames

Abstract

This research is concerned with the application of time-series measurements for minor-species concentrations to turbulent nonpremixed flames, so as to better understand scalar fluctuation rates. In the previous report, measurements of OH and CH concentrations were presented for jet diffusion flames composed of H2, CH4, and N2. The fluctuations in the time series were generally well characterized by only the integral time scale. In this report, a stochastic model based on the laminar flamelet concept is presented which can predict these integral time scales. Improvements over a prior version of this model and a more systematic application to the previous H2/CH4/N2 flames permit a reasonable prediction of the experimental trends. An application of this model to extrapolating mixture fraction statistics is discussed.

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Document Details

Document Type
Technical Report
Publication Date
Jun 19, 2001
Accession Number
ADP012107

Entities

People

  • Galen B. King
  • Jay P. Gore
  • Normand M. Laurendeau

Organizations

  • Purdue University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Data Science
  • Data Sets
  • Diffusion
  • Fluorescence
  • Frequency
  • Integrals
  • Laser Induced Fluorescence
  • Measurement
  • Mechanical Engineering
  • Military Research
  • Picosecond Time
  • Repetition Rate
  • Scientific Research
  • Simulations
  • Statistics
  • Technical Information Centers

Fields of Study

  • Physics

Readers

  • Combustion science or combustion engineering.
  • Computational Modeling and Simulation
  • Statistical inference.

Technology Areas

  • Directed Energy