Steam turbines have either of two conditions at the exit :(i) condensing or (ii) back-pressure. The condensing turbine expand the working medium (steam) upto a pressure a little lower than the ambient, taking into account the kinetic energy at the exit. This is generally a dead state and no further extraction of energy is possible. Change of state is effected to add more energy at higher density ( water) to continue the process further . The exhaust from a back-pressure turbine can be used for further transfer of energy in some process, including an ejector, to convert pressure energy into kinetic energy; thus reducing the pressure level ,without extracting any work.
@krishna
You are talking about the turbine extract as driving flow, but the question is the reverse. The inlet of the turbine is the driving and part of the outlet is driven by the ejector.
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