Abstract:
The following report deals with the designing and analysis of steam/gas ejector. Inlet
pressure, mass flow rate and temperature of both primary fluid and secondary fluid, back
pressure of diffuser, temperature of mixed fluid at diffuser end and entrainment ratio were
initial parameters used to design the ejector. Isentropic relations were used for designing
the primary nozzle which were obtained from various sources. Deciding factor in its
designing was the back pressure which was linked with nozzle position. Designing of
secondary nozzle was done partially by ESDU approach and partially with isentropic
relations of shockwave. First Shut off condition was also calculated for different nozzle
positons. Results obtained analytical were corroborated by CFD analysis of both primary
and secondary nozzle. Angles of convergence and divergence of both primary and
secondary nozzle and length of mixing chamber were selected after thorough CFD analysis.
The prototype was manufactured after detail review of the prototyping methods i.e. casting,
machining. Experiments were performed on the prototype while testing it in real time after
connecting it to an outlet of a boiler. The results were then compared and conclusions were
drawn.
