A laminar smoke point-based soot model considering surface growth and soot reactions

Abstract

This paper proposes a Laminar Smoke Point (LSP)-based soot model, incorporating (as opposed to previously developed LSP-based models) soot surface growth. The latter is indeed believed to be dominant in soot formation. Simple reactions are also introduced to account for the conversion of fuel and oxygen in soot evolution mechanisms. The proposed and a reference LSP-based soot models have been implemented in OpenFOAM-v2006 and assessed against a wide variety of laminar flames (16 flames). A calibration-evaluation procedure is defined in which some flames are involved in the calibration of the constants, and the majority are utilised in an independent evaluation stage. The results show that the newly added features to the LSP-based soot modelling approach allow for a better agreement over a wider range of conditions, e.g. diluted and highly sooty flames. It is shown that although the proposed model is more accurate for buoyant flames, it performs significantly better than the reference model for non-buoyant flames.

Keywords:

• CFD
• laminar smoke point
• soot modelling
• OpenFOAM
• laminar diffusion flames

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work is funded by Ghent University (UGent), Belgium. Project number BOF/STA/201909/008.