Investigation of Air Driven Ejectors at Elevated Temperatures

Abstract

Ejectors are often used to pump difficult fluids where conventional pumps will suffer operational and maintenance problems. One such application where ejectors may be used is in the pumping of high temperature gases. Experiments show that increasing the induced gas temperature causes a reduction in the ejector pumping performance in terms of its entrainment rate. A one-dimensional compressible flow theory is presented which predicts this, and the effects of other parametric changes and which also shows that the pumping performance can be restored by increasing the temperature of the forcing gas.