A method of calculating the maximum performance of jet pumps or ejectors is presented by eqs. (26), (27) and (28) or (29). These equations have been introduced by a one-dimensional analysis which contains some assumptions; namely, ideal gas law can be applied to primary and secondary gases, the mixing process of both the gases follows eq. (13), the flow is adiabatic to the outside of the ejector, and both the friction loss factor, ζ, and the ratio of specific heats, γ, are constant.
Eq. (28) is to be used for the design of jet pumps, and eq. (29) for ejectors.
Several diagrams, Fig. 2-12, are drawn for the designers' convenience. The calculations would be simplified by using these diagrams.
The comparisons between the calculation results and the experimental data have been made with some examples. Fairly good agreements are recognized as shown in Figs. 13, 14, 15.
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