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Direct Numerical Simulation of a Reacting Turbulent Hydrogen/Ammonia/Nitrogen Jet in an Air Crossflow at 5 Bar

Author

Listed:
  • Eugenio Giacomazzi

    (Laboratory of Processes and Systems Engineering for Energy Decarbonisation, ENEA, 00124 Rome, Italy)

  • Donato Cecere

    (Laboratory of Processes and Systems Engineering for Energy Decarbonisation, ENEA, 00124 Rome, Italy)

  • Matteo Cimini

    (Department of Mechanical and Aerospace Engineering, Sapienza University of Rome, 00184 Rome, Italy)

  • Simone Carpenella

    (Department of Civil, Computer Science and Aeronautical Technologies Engineering, Roma Tre University, 00146 Rome, Italy)

Abstract

The article aims to analyze the fluid dynamics and combustion characteristics of a non-premixed flame burning a fuel mixture derived from ammonia partial decomposition injected in an air crossflow. Nominal pressure (5 bar) and inlet air temperature (750 K) conditions are typical of micro-gas turbines. The effects of strain on the maximum flame temperature and NO generation in laminar non-premixed counter-flow flames are initially explored. Then, the whole three-dimensional fluid dynamic problem is investigated by setting up a numerical experiment: it consists of a Direct Numerical Simulation, based on accurate transport, chemical, and numerical models. The flow topology of the specific reacting jet in crossflow configuration is described in terms of its main turbulent structures, like shear layers, ring, and horse-shoe vortices, as well as of its leeward recirculation region anchoring the flame. The reacting region is characterized by providing instantaneous spatial distributions of temperature, heat release, and some transported chemical species, including NO , and calculating the Flame Index to identify non-premixed and premixed combustion local conditions. The latter is quantified by looking at the distribution of the volume fraction associated with a certain Flame Index versus the Flame Index and at the distribution of the average values of both the Heat Release Rate and NO versus the Flame Index and the mixture fraction.

Suggested Citation

  • Eugenio Giacomazzi & Donato Cecere & Matteo Cimini & Simone Carpenella, 2023. "Direct Numerical Simulation of a Reacting Turbulent Hydrogen/Ammonia/Nitrogen Jet in an Air Crossflow at 5 Bar," Energies, MDPI, vol. 16(23), pages 1-17, November.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:23:p:7704-:d:1285077
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    References listed on IDEAS

    as
    1. Sorrentino, Giancarlo & Sabia, Pino & Bozza, Pio & Ragucci, Raffaele & de Joannon, Mara, 2019. "Low-NOx conversion of pure ammonia in a cyclonic burner under locally diluted and preheated conditions," Applied Energy, Elsevier, vol. 254(C).
    2. Donato Cecere & Eugenio Giacomazzi & Antonio Di Nardo & Giorgio Calchetti, 2023. "Gas Turbine Combustion Technologies for Hydrogen Blends," Energies, MDPI, vol. 16(19), pages 1-29, September.
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