A STUDY ON OPPOSED GASEOUS JET FLAMES STABILIZED IN A UNIFORM AIRSTREAM : 2ND REPORT : MIXING CHARACTERISTICS OF OPPOSED JET

Abstract

The turbulent mixing in an isothermal opposed jet, which seems to be basically similar to that of an opposed gaseous jet flame, is studied theoretically and experimentally on the same point of view as in the previous report. It has been found that the development of the turbulent mixing depends on the velocity profiles at the nozzle exit section and the excess momentum of jets, and that the character of the jet changes gradually from a self-preserving pure jet at the virtual origin of the jet into a wake type of flow depending upon the local excess-velocity ratio on the axis. The application of the idea of the excess-momentum radius to the flow with combustion gives the same type of expression and a result similar to the isothermal opposed jet, which is verified experimentally. It has been found that the concept of excess-momentum radius is of use also for the opposed gaseous jet flame.