Difference between revisions of "Multi-inlet kerosene/air flame with scheme"

Revision as of 18:07, 24 March 2017

Objectives

The Stochastic_ReducedLuche test case shows the reduction of a reduced version of the Luche scheme ^[1], for a 0D 2-inlet configuration. Started with 43 species and 302 reactions, we reduce to 23 species and 221 reactions.

Principle

The configuration has 2 inlets, one of air and the second one of pure n-decane. The Luche scheme represents the fuel with a composition mainly based on n-decane (~77%) and we choose to start from a 100% n-decane fuel here, in order to run a relatively quick test case. The target species here are ${\displaystyle CO}$, ${\displaystyle CO_{2}}$ and ${\displaystyle O_{2}}$.

Key parameters

The main parameters are found in the condition.cpp file.

  configuration = "MultipleInlet";
  step = "DRGEP_species";

When you perform the next steps, the given mech is the one chosen from the previously step.

  mech= "mechanisms/luche_red_43s.xml";
  mech_desc = "luche";

  //Inlet 1
  listInlets.push_back(new MultipleInlet(
               /*Temperature*/ 750,
               /*Pressure*/ 1E+05,
               /*Mass flow rate*/ 0.500,
               /*Xk*/ "O2:0.2321, N2:0.7679",
               /*Yk*/ "",
               /**/ false,
               /**/ 0.0,
               /**/ 0.0,
               /**/ 0.0,
               /**/ 0.0));

  //Inlet 2
  listInlets.push_back(new MultipleInlet(
               /*Temperature*/ 750,
               /*Pressure*/ 1E+05,
               /*Mass flow rate*/ 0.017,
               /*Xk*/ "NC10H22:1.0",
               /*Yk*/ "",
               /**/ true,
               /**/ 1.28E-05,
               /**/ 4.91E-4,
               /**/ 810,
               /**/ 251000));

A third inlet is set for the burned gases, with the composition calculated at equilibrium.

   //BurnedGases
  listInlets.push_back(new Characteristics_MultipleInlet(
               /*Temperature*/ 2000,
               /*Pressure*/ 1E+05,
               /*Mass flow rate*/ 0.200,
               /*Xk*/ "N2:0.76308, O2:0.093573, H2O:0.072355, CO2:0.070468",
               /*Yk*/ "",
               /**/ false,
               /**/ 0.0,
               /**/ 0.0,
               /**/ 0.0,
               /**/ 0.0,
               /*tau_t*/ 2e-04,
               /*delta_t*/ 1e-05,
               /*nbIterations*/ 200,
               /*BurnedGases*/ true));

Be careful, the new_mixing parameter must be set to true only for the first step (DRGEP_species in that case).

  new_mixing = true;

Results

DRGEP step

The DRGEP_Species step ranks the species as follows

Bibliography

1. ↑ J. Luche. Elaboration of reduced kinetic models of combustion. Application to a kerosene mechanism. PhD thesis, LCSR Orleans, 2003.