Abstract:

ESDU 93022 introduces a FORTRAN program (ESDUpac A9322) for ejectors in which the primary and secondary flows are of non-reacting miscible liquids. Inlet conditions for both primary and secondary flows can be either a constant pressure source or provided by a pump. In the latter case, it is assumed that the head can be expressed as a quadratic in pump speed and flow rate. Two procedures are provided: a Design Procedure and a Performance Prediction Procedure. For Design, the input is a selection of entry and exit pressures and flow rates, together with estimates of loss coefficients in the primary and secondary inlets, mixing duct and diffuser and fluid properties. The program optimises the ejector, calculating the primary nozzle, secondary inlet and ejector exit dimensions. For Performance, the ejector dimensions are input together with the loss coefficients and fluid properties and a range of entry flow conditions; the program calculates flow conditions throughout the ejector and at exit. The equations on which the program is based are fully specified, the input format required is set out in clear tables, and two worked examples illustrate the use of the procedures.