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Energies 2015, 8(9), 9930-9945; doi:10.3390/en8099930

Swirling Combustor Energy Converter: H2/Air Simulations of Separated Chambers

Department of Astronautic, Electrics & Energetics Engineering, University of Rome "La Sapienza" Via Eudossiana 18, Rome 00184, Italy
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Academic Editor: Chang Sik Lee
Received: 13 May 2015 / Revised: 3 September 2015 / Accepted: 6 September 2015 / Published: 14 September 2015
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Abstract

This work reports results related to the “EU-FP7-HRC-Power” project aiming at developing micro-meso hybrid sources of power. One of the goals of the project is to achieve surface temperatures up to more than 1000 K, with a ∆T ≤ 100 K, in order to be compatible with a thermal/electrical conversion by thermo-photovoltaic cells. The authors investigate how to reach that goal adopting swirling chambers integrated in a thermally-conductive and emitting element. The converter consists of a small parallelepiped brick inside two separated swirling meso-combustion chambers, which heat up the parallelepiped, emitting material by the combustion of H2 and air at ambient pressure. The overall dimension is of the order of cm. Nine combustion simulations have been carried out assuming detailed chemistry, several length/diameter ratios (Z/D = 3, 5 and 11) and equivalence ratios (0.4, 0.7 and 1); all are at 400 W of injected chemical power. Among the most important results are the converter surfaces temperatures, the heat loads, provided to the environment, and the chemical efficiency. The high chemical efficiency, h > 99.9%, is due to the relatively long average gas residence time coupled with the fairly good mixing due to the swirl motion and the impinging air/fuel jets that provide heat and radicals to the flame. View Full-Text
Keywords: meso-combustor; hydrogen-air combustion; whirl flow; fluid-structure interaction; computational fluid dynamics (CFD); detailed chemistry meso-combustor; hydrogen-air combustion; whirl flow; fluid-structure interaction; computational fluid dynamics (CFD); detailed chemistry
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Minotti, A.; Teofilatto, P. Swirling Combustor Energy Converter: H2/Air Simulations of Separated Chambers. Energies 2015, 8, 9930-9945.

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