Improved Correlation for Blowout of Bluff-body Stabilized Flames (Preprint)

Abstract

With the advent of high-speed diagnostics and computers, new observations concerning the extinction process have been made, with the most general conclusion being that the extinction process is a wake phenomenon, where the flame is highly strained and dominated by large vortices. In the present paper a new correlation for lean extinction is derived using a linear least-squares fit and more than 800 data points from historical and current experiments. Fits of various dimensionless parameters are made, but the best fit is that of a Damkoehler number with ignition delay as the chemical time scale, verifying many previous conclusions. Finally, it is concluded that flame-holder size--not shape--is the driving parameter that represents the flame-holder geometry.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 2012
Accession Number
ADA560506

Entities

People

  • Amy C. Lynch
  • Barry V. Kiel
  • Bethany C. Huelskamp
  • Michael S. Klassen
  • Ponnuthurai Gokulakrishnan
  • Stanislav Kostka

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies
  • Materials and Manufacturing Processes
  • Space

DTIC Thesaurus Topics

  • Air Force
  • Air Force Research Laboratories
  • Boundary Layer
  • Chemical Reactions
  • Combustion
  • Combustion Products
  • Engines
  • Flame Holders
  • Fluid Dynamics
  • Fluid Flow
  • Geometry
  • Heat Transfer
  • Ignition Lag
  • Physics Laboratories
  • Reynolds Number
  • Turbines
  • Turbulent Mixing

Readers

  • Combustion science or combustion engineering.
  • Computational Modeling and Simulation
  • Fluid Mechanics and Fluid Dynamics.