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Research Papers

Ejector Model for High Temperature Fuel Cell Hybrid Systems: Experimental Validation at Steady-State and Dynamic Conditions

[+] Author and Article Information
Mario L. Ferrari

Thermochemical Power Group (TPG), Dipartimento di Macchine, Sistemi Energetici e Trasporti (DiMSET), Università di Genova, via Montallegro 1, Genova 16145, Italymario.ferrari@unige.it

Matteo Pascenti

Thermochemical Power Group (TPG), Dipartimento di Macchine, Sistemi Energetici e Trasporti (DiMSET), Università di Genova, via Montallegro 1, Genova 16145, Italymatteo.pascenti@unige.it

Aristide F. Massardo

Thermochemical Power Group (TPG), Dipartimento di Macchine, Sistemi Energetici e Trasporti (DiMSET), Università di Genova, via Montallegro 1, Genova 16145, Italymassardo@unige.it

J. Fuel Cell Sci. Technol 5(4), 041005 (Sep 05, 2008) (7 pages) doi:10.1115/1.2890102 History: Received August 04, 2006; Revised March 10, 2007; Published September 05, 2008

The aim of this work is the experimental validation of a steady-state and transient ejector model for high temperature fuel cell hybrid system applications. This is a mandatory step in performing the steady state and the transient analysis of the whole plant to avoid critical situations and to develop the control system. The anodic recirculation test rig, developed at TPG-University of Genoa, and already used in previous works to validate the ejector design models (0D and computational fluid dynamics), was modified and used to perform tests at transient conditions with the aim of ejector transient model validation. This ejector model, based on a “lumped volume” technique, has been successfully validated against experimental data at steady-state and transient conditions using air or CO2 at room temperature and at 150°C in the secondary duct inlet. Then, the ejector model was integrated with the models of the connecting pipes, and with the volume simulation tool, equipped with an outlet valve, in order to generate an anodic recirculation model. Also in this case, the theoretical results were successfully compared with the experimental data obtained with the test rig. The final part of the paper is devoted to the results obtained with square wave functions generated in the ejector primary pressure. To study the effects of possible fast pressure variations in the fuel line (ejector primary line), the test rig was equipped with a servo-controlled valve upstream of the ejector primary duct to generate different frequency pressure oscillations. The results calculated with the recirculation model at these conditions were successfully compared with the experimental data too.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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The ejector test rig at TPG-University of Genoa laboratory

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Figure 11

Recirculation model validation: ejector diffuser mass flow rate

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Figure 10

Recirculation model validation: pressures

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Figure 9

Ejector stand-alone condition: shutdown validation

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Figure 8

Ejector stand-alone condition: start-up validation

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Figure 7

Ejector model steady-state validation: CO2–CO2

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Ejector model steady-state validation: CO2-air

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Figure 5

Ejector model steady-state validation: air-air (3)

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Figure 4

Plant scheme in LABVIEW ™

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Figure 1

RRFCS 250kW generator module (1)

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Recirculation model validation: volume pressures during the square wave tests

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Pressure square waves from primary flow (fuel line): experimental results

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Figure 12

Primary flow controlled valve

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