Abstract

The theoretical computation of jets and flames in co-flowing streams is of considerable interest in aerothermochemistry. Axisymmetric flowfields are considered with time-mean velocity, temperature and species concentrations (three components — fuel, oxygen, and products) being predicted via a version of the GENMIX computer code. It is equipped with the standard Prandtl mixing length model of turbulence and an Arrhenius-type reaction rate expression for kinetically-influenced turbulent flame simulation. The code solves the boundary layer equations using a fully-implicit forward-marching solution procedure.

A variety of production runs have been made to show parameter effects, and results are tabulated, graphed and discussed. Complexities include:

1. The jet and surroundings may have different densities.

2. The surroundings may be co-flowing with nonzero axial velocity.

3. Flame ignition is via an outer annular hot zone.

4. Flames with typical hydrocarbon fuels burning in air are considered, and dissociation effects are included in a simple manner.

Results confirm the previous experimental findings about jet development in co-flowing streams, and extend knowledge to more practical and burning situations.

This content is only available via PDF.
You do not currently have access to this content.