Effect of von Karman Vortex Shedding on Regular and Open-slit V-gutter Stabilized Turbulent Premixed Flames

Abstract

The commercial code FLUENT is used for modeling and simulation of three- and twodimensional non-reacting and reacting flows past regular and open-slit V-gutters. Incompressible Large-Eddy Simulations with Dynamic Subgrid Kinetic Energy Model, C-progress variable equation and Zimont turbulent flame speed closure are used. C3H8 is used as the fuel. The measured and predicted time-averaged streamwise velocity and r.m.s velocity are qualitatively similar for both three- and two-dimensional regular V-gutters under non-reacting conditions.However, the two-dimensional geometry predicts a longer recirculation zone, but shifted upstream. The two-dimensional geometry overpredicts the turbulence fluctuation downstream the flameholder, whereas the three-dimensional geometry underpredicts it. The two-dimensional geometry exhibits greater drag coefficient (CD) per unit flameholder width than that of the corresponding three-dimensional geometry. However, the Strouhal numbers (St) for both geometries are similar.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 2012
Accession Number
ADA560959

Entities

People

  • Alejandro M. Briones
  • Balu Sekar

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force Research Laboratories
  • Boundary Layer
  • Combustion
  • Combustion Products
  • Energy
  • Equations
  • Flow
  • Fluid Flow
  • Kinetic Energy
  • Large Eddy Simulation
  • Physical Properties
  • Simulations
  • Strouhal Number
  • Three Dimensional
  • Turbulent Mixing
  • Two Dimensional
  • Vortex Shedding

Fields of Study

  • Physics

Readers

  • Fluid Mechanics and Fluid Dynamics.