Abstract
The numerical modelling of turbulent combustion of H2–air mixtures with solid graphite particles is a challenging and key issue in many industrial problems including nuclear safety. This study presents a Eulerian–Eulerian model based on the resolution of the Navier–Stokes equations via large eddy simulation (LES) coupled with a system of ordinary differential equations (ODEs) of the detailed chemical kinetics to simulate the combustion of mixtures of gases and particles. The model was applied to predict the transient evolution of turbulent combustion sequences of mixtures of hydrogen, air and graphite particles under low concentration conditions. When applied to simulate lab-scale combustion experiments, the results showed a good agreement between experimental and numerical data using a detailed chemical kinetic model. Moreover, the model was able to predict some key experimental tendencies and revealed that the presence of a low concentration of graphite particles (~96 g/m3) in the scenario influenced the hydrogen combustion dynamics for mixtures of 20% (in volume) of hydrogen in air. Under these conditions, pressure levels reached at the walls of the sphere were increased and the combustion time was shortened. The results also showed the viability of using this kind of a model for obtaining global combustion parameters such as wall pressure evolution with time.
Highlights
Introduction iationsCombustion of gas and particles mixtures is an issue of major interest in many different fields, including industrial combustors [1,2,3], pollutant emissions [4,5,6], solid propellants [7,8,9] or accident prediction and mitigation [10,11]
We explore the application of this model to a combustion two-phase flow problem with graphite particles in the presence of a premixed
The use of Large eddy simulation (LES), thickened flame model (TFM) and detailed kinetic schemes was explored as a way to take into account a realistic description of turbulence, flame wrinkling and reaction mechanisms in the turbulent combustion process
Summary
Combustion of gas and particles mixtures is an issue of major interest in many different fields, including industrial combustors [1,2,3], pollutant emissions [4,5,6], solid propellants [7,8,9] or accident prediction and mitigation [10,11] In this last field, prediction of particle behaviour with and without combustion is a key topic in nuclear power plants [12,13] as well as in fusion reactors such as the International Thermonuclear Experimental Reactor (ITER) [14,15].
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