Abstract
The main purpose of this paper has been to express experimental results in a form which reveals the fundamental principles for application to the design of ejectors. Notwithstanding the large losses of work energy in the nozzle, combining cone, and diffuser, the diffuser was found to obey the same laws of discharge as in convergent nozzles, although with a different constant. At the best nozzle settings, if P is the ejector outlet pressure, the position at which the pressure reached the adiabatic critical value P c = 0·55 P occurred at nearly the same point in the diffuser at maximum efficiency for wide variations in the working conditions, and for different forms of combining cone and diffuser throat. Also, the calculated area a c of the stream at this point was practically independent of the same factors. The position of the mouth of the nozzle had a predominant effect on the performance and efficiency, and the best nozzle positions were found to be nearly independent of the dimensions of the nozzle, the weight of steam and air flow, and the dimensions or form of the combining cone and of the diffuser throat.
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