Performance tests were conducted for an air ejector entraining two secondary jets which axes are coaxial of that of motive stream. The air ejector under investigation employed cylindrical-type mixing section, had nozzle throat -to- mixing chamber area ratio of 0.12 and motive air supply pressure which was maintained between 1.5 and 3 bar. A unique ejector housing was constructed to receive both the convergent or convergentdivergent primary nozzle and the mixing chamber. The entire unit adapts readily to any existing compressed-air system. The mixing chamber was so constructed that the length of its cylindrical section may be changed. Pressure variations along the mixing chamber were recorded, and this offered a valuable appreciation of the effect of the cylindrical length-to-diameter ratios. Results indicate the influence of the supply air pressure and cylindrical length-to-diameter ratio on the jet entertainment capacity. The occurrence of flow choking in both the convergent or convergentdivergent primary nozzle was ensured.
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