NUMERICAL-SIMULATION OF THE EFFECT OF VELOCITY RATIO ON THE FLOW CHARACTERISTICS IN A COAXIAL JET

Previous experimental work shows that velocity ratio is the principal independent variable to determine the flow behavior of coaxial jets. T his study focusing on the effect of velocity ratio on the flow charact eristics such as the velocity and kinetic energy profiles, centerline velocity decaying, how growing and entraining of the jet, presents a d etailed numerical simulation of a coaxial jet with a secondary paralle l moving stream. It is found that radial profiles of the mean velocity component u depending on the velocity ratio show good similarity in t he fully developed zone. Compared with available experimental data, th e results show that the use of standard k-epsilon model leads to good agreement between the numerical results and experimental data.