Accession Number : ADA119401

Title :   A Contribution to the Flat Flame Olympics: Problem B.

Descriptive Note : Final rept.,


Personal Author(s) : Heimerl,Joseph M

PDF Url : ADA119401

Report Date : Aug 1982

Pagination or Media Count : 67

Abstract : This report discusses in detail the input parameters used in computing flame speeds and profiles for the stoichiometric hydrogen-air premixed, steady-state, laminar flame. The input kinetics were specified. OUr solution was obtained by use of a relaxation technique. The partial differential equations were solved using a finite element method, PDECOL. A special algorithm that enabled spatial grid points to be placed in the flame front was used. Results include: (1)information requested by the workshop that deals with specific transport parameters, (2) computed flame speeds, (3) mass fraction peak values of radical species profiles, and (4) the extrema of the enthalpy profile. We also consider the likely sources of our computed HO2 'spike' and OH double peak. We also found features in the N2 and O2 mole fraction profiles that are due simply to the mass-to-mole fraction transformation. Finally, we have compared the flame speeds, radical peaks, and enthalpy extrema when two quite different transport mixing algorithms were used.(etc.)

Descriptors :   *Mathematical models, *Flames, *Flame propagation, Differential equations, Hydrogen, Oxygen, Temperature, Boundary layer, Stoichiometry, Thermodynamics, Heat transfer coefficients, Thermal conductivity, Algorithms, Computerized simulation, Velocity

Subject Categories : Thermodynamics
      Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE