Non-premixed turbulent combustion in a laboratory scale ﬂame (Delft III ﬂame) is studied using a statistical description at the one-point one-time joint velocity—scalar composition probability density function (PDF) level. The PDF evolution equation is solved using a stochastic Lagrangian Monte Carlo method. The PDF equation requires a so called micro-mixing model for closure and the performance of two micro-mixing models is investigated. The Interaction by Exchange with the Mean (IEM) micro mixing model is the most commonly adopted model. The IEM model was developed for the scalar PDF method and does not depend on velocitystatistics.AphysicallymoresoundextensionoftheIEMistheInteractionby Exchange with the Conditional Mean (IECM) which involves mixing of the scalars towards mean values conditional on the velocity. Both models are applied in this workanditisshownthattheIECMmodeldoesperformsigniﬁcantlybetterthanthe simple IEM model.
|Title of host publication||Stochastic equations for complex systems|
|Subtitle of host publication||Theoretical and computational topics|
|Editors||S Heinz, H Bessaih|
|Place of Publication||Cham, Switzerland|
|Publication status||Published - 2015|