Representation of measured ejector characteristics by simple Eulerian bond graph models

For some time, a purely fluidic type of pump or compressor has existed. This device possesses no solid moving parts. Such an ejector of jet-pump employs the momentum of a high velocity jet from the drive flow to entrain and pressurize a secondary suction flow stream. One application of such ejectors is related to an employment by the nuclear industry. Certain accidents have drawn attention to the grossly inadequate data base for ejectors operating under extreme pathological conditions including reverse flows. In connection with these developments, extensive tests were conducted. The present paper uses primarily data obtained in these tests. Attention is given to an analysis of the test results, aspects of bond graph representation, internal Eulerian flows satisfying a condition of Eulerian similitude, a canonical model, moduli functions, a near-perfect Eulerian device, and constant and variable paramter models. The considered tests and studies made it possible to establish a structured performance model for ejectors.