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Swirling Combustor Energy Converter: H 2 /Air Simulations of Separated Chambers

Author

Listed:
  • Angelo Minotti

    (Department of Astronautic, Electrics & Energetics Engineering, University of Rome "La Sapienza" Via Eudossiana 18, Rome 00184, Italy)

  • Paolo Teofilatto

    (Department of Astronautic, Electrics & Energetics Engineering, University of Rome "La Sapienza" Via Eudossiana 18, Rome 00184, Italy)

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 H 2 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.

Suggested Citation

  • Angelo Minotti & Paolo Teofilatto, 2015. "Swirling Combustor Energy Converter: H 2 /Air Simulations of Separated Chambers," Energies, MDPI, vol. 8(9), pages 1-16, September.
    • Handle: RePEc:gam:jeners:v:8:y:2015:i:9:p:9930-9945:d:55725
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    References listed on IDEAS

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    1. Angelo Minotti & Enrico Sciubba, 2010. "LES of a Meso Combustion Chamber with a Detailed Chemistry Model: Comparison between the Flamelet and EDC Models," Energies, MDPI, vol. 3(12), pages 1-17, December.
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    Cited by:

    1. Seyed Ehsan Hosseini & Evan Owens & John Krohn & James Leylek, 2018. "Experimental Investigation into the Effects of Thermal Recuperation on the Combustion Characteristics of a Non-Premixed Meso-Scale Vortex Combustor," Energies, MDPI, vol. 11(12), pages 1-16, December.
    2. Ruirui Wang & Jingyu Ran & Xuesen Du & Juntian Niu & Wenjie Qi, 2016. "The Influence of Slight Protuberances in a Micro-Tube Reactor on Methane/Moist Air Catalytic Combustion," Energies, MDPI, vol. 9(6), pages 1-17, May.
    3. Angelo Minotti, 2016. "Energy Converter with Inside Two, Three, and Five Connected H 2 /Air Swirling Combustor Chambers: Solar and Combustion Mode Investigations," Energies, MDPI, vol. 9(6), pages 1-15, June.

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