1002 RESONANCE JET FLOW FROM NOTCHED ORIFICE NOZZLE

抄録

Setting the second orifice nozzle after the first orifice nozzle with a resonance room, the jet causes a periodic resonance oscillation. In this study, the resonance frequency dependence on the jet velocity and the volume of resonance room were presented. Furthermore, in order to enhance the flow fluctuation at the nozzle exit, a notched orifice nozzle was used as the second one and a comparison of the flow characteristics with those of the resonance orifice nozzle is also performed. The velocity measurements of jets from the resonance notched nozzle by a constant temperature hot-wire anemometer indicate that the turbulent intensity at the nozzle exit increased by about 74% compared with that of the resonance orifice jet. It is also found that the resonance frequency decreases with increasing the volume of resonance room and that the mixing characteristics are improved in the downstream.