N Hnaien - Unite de Metrologie et des systemes energetiques, National Engineering School of Monastir, Monastir, Tunisia
S Marzouk Khairallah - Unite de Metrologie et des systemes energetiques, National Engineering School of Monastir, Monastir, Tunisia
H Ben Aissia - Unite de Metrologie et des systemes energetiques, National Engineering School of Monastir, Monastir, Tunisia
J Jay - Centre de Thermique de Lyon, INSA de Lyon, France

In the present investigation, we propose a numerical simulation of two plane parallel turbulent jets.Several turbulence models were tested in the present work: the standard k   , the standard k   andthe RSM models. A parametric study was also presented to pick up the nozzles spacing and thevelocity ratio effect on the merge and combined point’s axial and transverse positions. An investigationin the velocity ratio effect on the strong and weak jet spreading was also performed. It has beenshowed through the present investigation that the velocity ratio significantly affects the merge andcombined point’s positions. Correlations between the merge and combined points position with respectto the nozzle spacing and the velocity ratio were also provided. Results shows that the increase in thevelocity ratio moves the merge and combined points further upstream in the longitudinal directionwhile deflecting toward the strong jet in the transverse direction. The present numerical investigationallow us to conclude that when increasing the velocity ratio, the weak jet exercises some braking on thestrong jet, which decelerates its spread. On the other hand, the strong jet produces some acceleration onthe weak jet, which enhances its spread.

Combined PointMerge PointSpacingTurbulentTwo JetsVelocity Ratio