Gas ejector modeling for design and analysis

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Title: Gas ejector modeling for design and analysis
Author: Liao, Chaqing
Abstract: 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 .
URI: http : / /hdl .handle .net /1969 .1 /ETD -TAMU -3206
Date: 2009-05-15


Gas ejector modeling for design and analysis. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -3206 .

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