For the second the input is a selection of entry and required exit pressures and flow rates, together with estimates of loss coefficients in the primary and secondary nozzles, mixing duct and diffuser.
If other gases are handled the secondary mass flow rate is converted by the program to an equivalent rate based on the molar mass of the secondary gas. The first is based on experimental data obtained for steam ejectors pumping air at 20 degrees C. Three procedures are provided: a Quick Design Procedure, a Detailed Design Procedure and Performance Prediction.
ESDU 94046 introduces a program (ESDUpac A9446) for ejectors in which the primary and secondary flows are non-reacting gases that can be modelled as real.
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