Evaluation of a Lagrangian Soot Tracking Method for the prediction of primary soot particle size under engine-like conditions

Abstract

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Effects of Ambient Oxygen and Density on Primary Soot Size under Diesel-Like Conditions Using a Lagrangian Soot Tracking Model

“…For computational expediency, the cylindrical chamber was simplified to a 4-degree axisymmetric wedge with a single layer of cells in the tangential direction. Details of the mesh and geometry can be found herein [32]. The time step size was fixed at 0.2 μs.…”

“…Details about the mechanism can be referred to in [45]. In this current study, the spray combustion solver was incorporated with a LST model [32]. The LST model is explained in detail in our previous study [32] but for completeness the essential features are outlined here.…”

“…The spatial location of the predicted SVF is further downstream than the measured SVF. This can be attributed to the use of the Moss-Brookes soot model in the formulation of the LST model which is discussed in [32]. It is shown in Ref.…”

“…It is important to note that the aforementioned studies were both related to gas turbine applications. A Lagrangian soot tracking (LST) model based on a semi-empirical formulation was recently developed by Ong et al [32] and was successfully implemented for diesel spray applications. The LST model was validated using the experimental data of n-dodecane and n-heptane spray flame from the Engine Combustion Network.…”

“…Setting against this background, the present study is carried out by integrating the previously developed LST model [32] with a reduced n-heptane chemical mechanism to investigate the effect of ambient oxygen and density on primary soot size in a Sandia nheptane reacting spray. The paper is structured such that numerical formulation and setup are first provided.…”