Moderate or Intense Low-oxygen Dilution (MILD) combustion is considered as one of themost promising novel combustion technologies, as it ensures high efficiency and very lowemissions (NOx and CO). Because of the high level of dilution, the system reactivity isreduced and the chemical time scale is increased compared to conventional flames.Therefore, combustion models accounting for finite-rate chemistry are needed to study thecharacteristics of such flames. Reactor based models, such as the Partially Stirred Reactorand the Eddy Dissipation Concept models have been successfully used to model MILDcombustion. This article describes recent progress and developments in the application ofreactor based models for the simulation of the jet-in-hot-coflow burners that emulate MILDcombustion. The main objective is to provide an overview about the current state of the artof reactor based models for turbulence-chemistry interactions in MILD regime and outlinefuture prospects for the further development of such models. The literature acknowledgesboth Reynolds Averaged Navier Stokes and Large Eddy Simulations studies, with variousoperating conditions as well as different fuels. The results indicate that it is necessary toinclude both the mixing and chemical time scales explicitly in the combustion modelformulation. Because of the distributed reaction area, according to recent investigations,Large Eddy Simulation grid can be sufficient to resolve the MILD combustion reactingstructures. The present review underlines the importance of finite rate chemistry in MILDcombustion simulations, as well as of providing reliable estimation of the characteristic timescales.
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