I am simulating for simple combustion of air-fuel mixture at different temperatures and equivalence ratios. Chemkin- Singular Jacobian error, No solution found, Particle solver error, Changing initial guess. However, it was concluded that the biodiesel fuel with a higher fraction of unsaturated FAMEs (more double carbon bonds C C) contributed more to the formation of soot precursors, thus producing a higher amount of soot particles in mass and numbers as a consequence of accelerated soot particle nucleation and soot surface growth. Also, the particle number concentration decreases and increases alternatively inside the reaction chamber because of constant removal of existing (nucleation-mode and ambient preexisting) particles and reoccurrence of NPF, while the particle surface area decreases monotonically because of the removal of large preexisting particles (Fig. Chemkin- Singular Jacobian error, No solution found, Particle solver error.
The reduction of exhaust soot from biodiesel combustion, compared to diesel fuel, was attributed to the suppressed soot precursors formation and lower number of particles in total.
The proposed numerical approach, with a quad-component skeletal mechanism of biodiesel blend surrogates along with a multi-step phenomenological soot particle model, could capture the soot particle characteristics of test fuels with acceptable accuracy under engine combustion conditions. In this study, numerical analysis of fuel structures on engine soot particles’ mass and size were done by CFD combustion modelling using diesel and different levels of unsaturated biodiesel fuels through the KIVA4-CHEMKIN platform.
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