Aerodynamics issues and configurations in MILD reactors

Sorrentino, Giancarlo; Ariemma, Giovanni Battista; Manna, Maria Virginia; Cavaliere, Antonio; Sabia, Pino; Joannon, M. de; Ragucci, Raffaele

doi:10.1016/b978-0-323-85244-9.00006-x

Cited by 3 publications

(2 citation statements)

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“…Nonetheless, in industrial applications, MILD combustion is achieved through massive burnt gas recirculation, which allows for dilution of the inlet mixture before its ignition. The specific design of the inlet jet aerodynamics together with a tailored flow field inside the combustion chamber permits the acquisition of the desired recirculation degree . The local dilution strongly affects mixing and chemical scales, making such configurations deeply different from JHC and Cabra configurations, which are only based on the modification of the kinetics time scale.…”

Section: Introductionmentioning

confidence: 99%

“…The specific design of the inlet jet aerodynamics together with a tailored flow field inside the combustion chamber permits the acquisition of the desired recirculation degree. 26 The local dilution strongly affects mixing and chemical scales, making such configurations deeply different from JHC and Cabra configurations, which are only based on the modification of the kinetics time scale. In fact, other representative characteristics of MILD combustion commonly found in burners with an internal exhaust gas recirculation (EGR) are absent in the JHC configuration.…”

Section: Introductionmentioning

confidence: 99%

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Performance Assessment of Modeling Approaches for Moderate or Intense Low-Oxygen Dilution Combustion in a Scale-Bridging Burner

Giuntini,

Frascino,

Ariemma

et al. 2023

Energy Fuels

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The present work provides deep insights into methane oxidation in a cyclonic flow field chamber whose strong internal recirculation of burnt products enables the attainment of a moderate or intense low-oxygen dilution (MILD) combustion regime over a wide range of operating conditions. Steady-state Favreaveraged Navier−Stokes (FANS) simulations are performed to evaluate the thermochemical processes taking place within the reactor and to assess the suitability of existing computational fluid dynamics (CFD) models to describe the turbulence−chemistry interactions in such a scale-bridging configuration. A sensitivity analysis is carried out with respect to different turbulence closure models [i.e., renormalization group (RNG) k−ε, realizable k−ε, and Reynolds stress model], kinetic mechanisms (i.e., KEE-58 and GRI-Mech 2.11), as well as different turbulent combustion approaches, i.e., the flamelet generated manifold (FGM), the eddy dissipation concept (EDC), and the partially stirred reactor (PaSR) models. The accuracy of numerical predictions is assessed by a direct comparison to obtained experimental results in terms of temperature profiles locally collected within the reactor and flue gas compositions monitored at the exit of the burner. Results highlight that the EDC and PaSR methods are the most suitable modeling paradigms for the investigated MILD combustion conditions, although the former may likely predict an extinction of the combustion process; conversely, the FGM model shows the largest discrepancies with respect to experimental data, highlighting the need for improvements.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%