Abstract
Among the factors which affect the performance characteristics of a pneumatic ejector, the effect of the distance α' from the nozzle exit section to the entrance of the parallel part of the mixing tube was experimentally dealt with in the present paper. It was found that the optimum distance α' for the highest vacuum and the highest ejector efficiency was α'=15mm, so long as the present ranges of experiments were concerned. As the inner diameter e of the parallel part of the mixing tube was selected as e=9.55mm, the optimum value above-mentioned yields to α'/e=1.57, which coincides with the results obtained previously by L.J. Kastner, J.R. Spooner for a pneumatic ejector. Besides, the present authors have measured the pressure distributions in the mixing tube, the results of which were compared with the theories by W. Tollmien and A.M. Kuethe. Further, the results of the present paper were compared with the results hitherto published for steam ejectors.
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