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This chapter explores the unsteady modelling and simulation of turbulent pulverised solid fuel combustion, transitioning models from coal to biomass in oxy-fuel chambers. The first section introduces the models implemented in OxySim-129, structured around three pillars: (1) solid fuel conversion, (2) gas-phase turbulence-chemistry interaction, and (3) turbulent flow, mixing, and particle movement. Solid fuel conversion covers devolatilisation and char burnout. Gas-phase combustion of complex volatiles is handled using an extended tabulated flamelet approach, balancing fidelity and computational efficiency. Turbulent flow is modeled with large eddy simulations (LES), while particles are treated as Lagrangian point particles. Computational reactor networks (CRN) enable detailed chemistry integration with a reduced-order fluid dynamics model. The second section applies this framework to combustion systems of varying scales, focusing on model validation and key physical processes observed in research burners.

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OxySim-129 Simulation Framework

  • 章节

  • 出版模式：

    开放获取

  • 发表日期：

    2026年

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  • Pascal Steffens,
  • Antje Vahl,
  • Leon Loni Berkel,
  • Hendrik Nicolai,
  • Christian Hasse

摘要

This chapter explores the unsteady modelling and simulation of turbulent pulverised solid fuel combustion, transitioning models from coal to biomass in oxy-fuel chambers. The first section introduces the models implemented in OxySim-129, structured around three pillars: (1) solid fuel conversion, (2) gas-phase turbulence-chemistry interaction, and (3) turbulent flow, mixing, and particle movement. Solid fuel conversion covers devolatilisation and char burnout. Gas-phase combustion of complex volatiles is handled using an extended tabulated flamelet approach, balancing fidelity and computational efficiency. Turbulent flow is modeled with large eddy simulations (LES), while particles are treated as Lagrangian point particles. Computational reactor networks (CRN) enable detailed chemistry integration with a reduced-order fluid dynamics model. The second section applies this framework to combustion systems of varying scales, focusing on model validation and key physical processes observed in research burners.