ESDU 92042:2011

ESDU 92042 introduces a Fortran program (available as ESDUpac
A9242) for the design or performance assessment of ejectors (or jet
pumps) in which the primary and secondary flows may be of the same
or of different gases. It uses two approaches to design. The quick
design method is based on an analysis of experimental data for
single-nozzle designs and, given a minimum of input (selection of
entry and required exit pressures, temperatures, mass flow rate and
dimensions), will calculate primary nozzle and exit dimensions. The
detailed design method, based on one-dimensional flow equations
that are detailed, applies also to multi- and annular-nozzle
designs. In addition to the input for the quick method, it requires
loss factors (in the primary and secondary nozzles, mixing duct and
contraction or diffuser) and acceptable maximum design values for
four parameters, but will calculate flow conditions throughout the
ejector. The performance assessment method for an existing design,
also based on the one-dimensional flow equations, calculates
conditions throughout the ejector and at exit given the geometry,
loss factors and a range of entry conditions. The use of the three
methods is illustrated in a worked example. The program is provided
as an executable file and within ESDU view.