EXPERIMENTAL INVESTIGATION OF THE DRIVING JET OF AN INDUCED FLOW EJECTOR OPERATING IN A MIXED-FLOW CONDITION

An experimental investigation of the driving (or primary) jet of an induced air ejector operating in a mixed flow condition is presented. This study is carried out using recently developed investigation techniques in order to measure the centerline static pressure, and to achieve the visualization of the flow in the secondary nozzle. The results permit the study of the driving jet expansion in the primary nozzle, and the detection of the appearance of the mixed flow pattern with separation. Effects of the driving and entrainment ratios on the behaviour of the driving jet, and on the recompression and mixing processes in the secondary nozzle, are also examined. Suggestions for the design of the mixing tube are indicated.