Stagnation Point Offset of Two Opposed Jets

The axial velocity and the stagnation point offset of impinging streams from two opposed nozzles have been theoretically studied and experimentally measured by smoke wire visualization and hot-wire anemometry (HWA) techniques. The results show that, for small nozzle separation (L/D < 2), the equations based on Reynolds stress theory can be used to predict the stagnation point offset for two nozzles of the same size. For middle nozzle separation (2 <= L/D <= 12), the stagnation position is very sensitive to the exit velocity ratio and that it changes nonlinearly with increasing nozzle separation. For large nozzle separation (L/D > 12), the equations based on the free jet theory can be used to predict the stagnation point offset for two nozzles of the same and different sizes. The illustrated effects of the exit momentum ratio and the nozzle separation on the stagnation point offset are useful for defining the optimum conditions for many industrial applications of the opposed jets.