Abstract
Moderate or Intense Low Oxygen Dilution (MILD) combustion is a fuel-flexible combustion technology featuring high efficiency and low pollutant emissions. Fundamental studies reveal that turbulence-chemistry interactions are extremely complex in MILD conditions and reactor-type approaches seem to be the adequate modelling choice. In this work we develop a generalised Eddy Dissipation Concept (EDC) adapted to MILD combustion regime accounting for finite rate chemistry. We examine two recent modifications of the standard EDC and present a generalised model. It is based on functional expressions where the model parameters are adjusted to the local conditions in terms of Reynolds and Damköhler numbers, contrary to the usually proposed ad hoc tuning of the global EDC constants. Numerical results reveal that previously presented corrections are indeed suitable for specific conditions; their appropriate combination, guided by physical premises and a scrutiny of computation results, leads to a reformulation of the EDC framework. The study consists of two parts: the model development is described here (Part 1); in a companion paper (Part 2), we present a thorough validation process performed against twelve flames issuing from the jet-in-hot-coflow burners from Delft and Adelaide, representing a wide range of operating conditions. The new, generalised model can serve as a plug and play engineering tool without complex pre- or post-processing treatment.
Highlights
New combustion concepts are emerging or getting more popular, and are intensively investigated as a result of new trends in technology development
Fundamental aspects of Moderate or Intense Low-oxygen Dilution (MILD) combustion of different types of fuels with a focus on industrial applications were presented by Weber et al [11] and some issues of its mathematical modelling were discussed by Mancini et al [12]
We present a comprehensive development toward an easy-to-use and simple, yet accurate, turbulent combustion model incorporating finite rate kinetics at affordable computational cost, based on the Eddy Dissipation Concept
Summary
New combustion concepts are emerging or getting more popular, and are intensively investigated as a result of new trends in technology development. The technique is called Flameless Oxidation (FLOX) [1], Highly Preheated Air Combustion (HPCA) [2], High Temperature Air Combustion (HiTAC) or Colorless Distributed Combustion (CDC) [3]. Luan et al [9] presented an interesting study identifying MILD regime in a non-adiabatic well-stirred reactor. They composed a combustion map using initial inlet temperature and oxygen concentration. A comprehensive review on flameless combustion and its potential for gas turbine applications, discussing the regime definition, basic experimental investigations, computational modelling aspects, design of the combustors including future challenges has been recently published by Perpignan et al [14]
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