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A generalized ejector model was successfully developed for gas ejector design and
performance analysis . Previous 1 -D analytical models can be derived from this new
comprehensive model as particular cases . For the first time , this model shows the
relationship between the cosntant -pressure and constant -area 1 -D ejector models . The
new model extends existing models and provides a high level of confidence in the
understanding of ejector mechanics . “Off -design” operating conditions , such as the
shock occurring in the primary stream , are included in the generalized ejector model .
Additionally , this model has been applied to two -phase systems including the gas -liquid
ejector designed for a Proton Exchange Membrane (PEM ) fuel cell system .
The equations of the constant -pressure and constant -area models were verified . A
parametric study was performed on these widely adopted 1 -D analytical ejector models .
FLUENT , commercially available Computational Fluid Dynamics (CFD ) software , was
used to model gas ejectors . To validate the CFD simulation , the numerical predictions were compared to test data and good agreement was found between them . Based on this
benchmark , FLUENT was applied to design ejectors with optimal geometry
configurations . |
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