Hot flow testing of multiple nozzle exhaust eductor systems.
Abstract
Hot flow model tests of multiple nozzle gas turbine
exhaust eductor systems were conducted to evaluate the
temperature effects of several eductor design modifications.
A one-dimensional analysis of a simple eductor system based
on conservation of momentum for an incompressible gas was
used in determining the nondimensional parameters governing
the flow. Eductor performance is defined in terms of these
parameters. Compared to existing solid wall eductors, the
addition of film cooling slots in the mixing stack, a mixing
stack shroud and a double split ring diffuser section was
found to significantly improve the pumping coefficient of the
eductor, and drastically decrease all external surface temperatures
as well as moderately reduce the maximum gas discharge
temperature.
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