Velocity and concentration characteristics and their cross correlation for coaxial jets in a confined sudden expansion. II  Predictions
Abstract
Measurements of coaxial jets in a confined sudden expansion were performed; the geometric parameters of the experiment were appropriate to the aircraft gas turbine combustor and the twoequation turbulence model. This paper gives the prediction of this flow made with a mathematical model. Predictions and comparisons with the experimental data include radial profiles of timeaveraged axial velocity, radial velocity, mixture fraction, and their fluctuations, kinetic energy of turbulence, turbulent shear stress, and turbulent mass flux. Qualitative agreement was obtained for all variables. Earlier recommendations concerning a lower turbulent Schmidt number than normally used are confirmed, and the assumption of a constant Schmidt number across the flow appears to be adequate for the calculation of timeaveraged scalar quantities.
 Publication:

Fluid Mechanics of Combustion Systems
 Pub Date:
 1981
 Bibcode:
 1981fmcs.proc..161S
 Keywords:

 Coaxial Nozzles;
 Flow Velocity;
 Gas Expansion;
 Jet Mixing Flow;
 Prediction Analysis Techniques;
 Aircraft Engines;
 Combustion Chambers;
 Composition;
 Computational Fluid Dynamics;
 Cross Correlation;
 Gas Turbine Engines;
 Mathematical Models;
 Schmidt Number;
 Shear Stress;
 Turbulence Models;
 Turbulent Flow;
 Turbulent Jets;
 Fluid Mechanics and Heat Transfer