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.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/ETD-TAMU-3206 |
| Date | 15 May 2009 |
| Creators | Liao, Chaqing |
| Contributors | Best, Frederick R. |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | Book, Thesis, Electronic Dissertation, text |
| Format | electronic, application/pdf, born digital |
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