Combustion and soot modelling of a high-pressure and high-temperature Dodecane spray

Abstract

Diesel engines are known to be one of the main sources of soot particle emission in the atmosphere. The norms to restrain these emissions have created a need of accurate soot models for piston engine emissions prediction in the automotive industry. This article addresses this question by coupling a sectional soot model with a tabulated combustion model for Reynolds-averaged Navier-Stokes simulations of the engine combustion network Spray A, a high-pressure Dodecane spray with conditions very similar to diesel engine sprays. The sectional soot model, which has already been used in diesel engines Reynolds-averaged Navier-Stokes simulations with a simpler combustion model, is implemented in the IFP-C3D Reynolds-averaged Navier-Stokes computational fluid dynamics code. At each time and location, transport equations are solved for several soot sections, including source terms for collisional and chemical processes. The soot model is here coupled to the approximated diffusion flame-presumed conditional moment model, which is a tabulated combustion model. It allows to represent the minor species required by the soot model with a much lower computational cost than a kinetic solver and includes complex turbulence-chemistry interactions. The predictions of these models agree with the experimental measurements for most of the Spray A cases for flame structure and soot production. These results show that detailed soot models can be coupled to tabulated combustion models with good results in turbulent flames.

A numerical study of the effect of nozzle diameter on diesel combustion ignition and flame stabilization

“…The Spray A experiment, a single-hole nozzle injecting into a quiescent environment with thermodynamic conditions representative of CI engines, has allowed the development of an extensive database of experimental results. [8][9][10][11][12][13] On the simulation side, the single-hole nozzle experiment has enabled the comprehensive validation of the two-phase turbulent spray using both Lagrangian-Eulerian [14][15][16][17] and Eulerian 18,19 approaches.…”

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

“…With this aim, the approximated diffusion flamelet (ADF) model was suggested some years ago 24 and has proved to be accurate enough for its application to this kind of simulations. 9,23,[25][26][27] This article presents an analysis of a reacting diesellike spray by means of LES simulations in conjunction with a flamelet model. ECN spray A from ECN has been chosen since it has been targeted by many studies and, hence, it has become a sort of benchmark for this type of analysis.…”

Modelling of Soot Aerosol Dynamics in Turbulent Flow

“…Netzell [133] developed a method that, while not derived via a finite element method, allows for variation of the distribution within each bin. This approach was used in a number of soot modelling studies on laminar [134,135] and turbulent [136,137] flames, a diesel spray confined in a high-pressure vessel [138] and a Diesel engine [139].…”

“…Fraioli et al [165] applied the soot model of D'Anna and co-workers [41,44] to the simulation of an IC engine using the eddy dissipation model. Aubagnac-Karkar et al [134,138,139] applied the approach of Netzell et al [133,136] to the RANS modelling of IC engine combustion in conjunction with a tabulated chemistry model and kinetics for Diesel surrogate fuels. In these works, no further modelling of the coupling between turbulence and soot aerosol dynamics was attempted, other than the assumptions inherent in the eddy dissipation and flamelet models.…”