Application of a flamelet-based combustion model to diesel-like reacting sprays

Understanding the diesel-like spray characteristics applying a flamelet-based combustion model and detailed large eddy simulations

“…An interesting case of this observation is that the total mass of acetylene in the domain, which is important since it is a soot precursor, decreases when augmenting the oxygen concentration in agreement with previous RANS simulations carried out with this model. 45 This is shown in Figure 13 where the total mass found in the domain for acetylene is represented for the oxygen parametric sweep. The error bars indicate the standard deviation of the total mass and only consider the solved part of the field (the sub-grid component is not included).…”

“…The interested reader can find more details in the studies by Desantes et al 35 and Pérez Sánchez. 45 As previously explained, the flamelet concept describes the turbulent flame as an ensemble of strained laminar flames where the gradients along the tangent directions are negligible compared to those found in the normal one. This leads to adopt a one-dimensional description for the laminar flames whose species transport equations can be written in the mixture fraction space as 46,47…”

Influence of the n-dodecane chemical mechanism on the CFD modelling of the diesel-like ECN Spray A flame structure at different ambient conditions

“…The chemical source term required to solve CFD transport equations is found from the difference between the next value predicted by the turbulent manifold and the current value in the cell divided by the time step. More details can be found in [42,32,33,43].…”

Considerations for the temperature stratification in a pre-burn constant-volume combustion chamber

“…At 1.5 ms, the LOL differs by approximately 2 mm between realizations #1 and #4. Pachano Prieto [60] showed a 7 mm longer LOL for the SAGE model [35] compared to the Unsteady Flamelet Progress Variable model [61,62] under uniform-temperature Spray A conditions, and while also using RANS simulations and the same chemical mechanism as in this study [36].…”