A two-dimensional planar computational investigation of flame broadening in confined non-premixed jets

The near-exit region of confined, unsteady, momentum dominated, non-premixe d, chemically reacting jets is investigated computationally using one-step chemistry. Non-premixed flame/wall interaction is manifested in the form of reaction zone broadening. Depending on the value of the stoichiometric mix ture fraction, the flame zone moves into or out of the region of strong she ar. For flames with large stoichiometric mixture fraction, the flame region is located in closer proximity to the isothermal wall. With increased stoi chiometric mixture fraction, reaction thicknesses predicted by asymptotic t heory differ from flame zone thicknesses obtained from the simulation datab ases. (C) 1999 by The Combustion Institute.