Soot modeling with Particle sectional model (PSM) in diesel engine. Results and discussion

F Ravet, L Dutfoy, B Rathinam, H Lehtiniemi, L Seidel, C Netzer, F Mauss

Abstract

Soot modeling is key issue in the design process of a Diesel combustion chamber. Close future Europeans standards evolution will be only on the mass emissions but also on size particles. Consequently, be able to predict size particles at the engine out is crucial for current combustion chamber developments. In addition, pollutants emission European standard are becoming more and more stringent and the cost of the after-treatment is increasing significantly. Thus, motivations to develop more accurate pollutants model to help for efficient design of the combustion chamber are high. PSM soot modeling was developed in the period 2006 – 2010 in a close cooperation between Renault, Cottbus University with Pr Fabian Mauss and the company LOGE. They support the chemistry development needed to the PSM model and their work was a great contribution. PSM model is based on the description of the current knowledge soot formation process: inception, coagulation, surface growth and oxidation.
The inception model is based on temperature and soot precursor concentration. Soot precursor are usually complex hydrocarbon species and the calculation of the concentration needs chemistry mechanism with a number species over state of the art number significantly.
PSM model was implemented in CONVERGE software by CONVERGE science. The model coupling with a compatible Diesel mechanism were evaluated on a large range of combustion conditions and be compared to measurements from one-single cylinder tests. A good agreement were obtained and promising issues in designing process have been determined