Too long to post as a comment.
See Modeling of kerosene combustion under fuel-rich conditions in Researchgate or here or in Advances in Mechanical Engineering 9(7) · July 2017
Also, from Thermophysics Characterization of Kerosene Combustion by Ten-See Wang l
NASA Marshall Space Flight Center, Huntsville:
Under fuel rich conditions, kerosene/RP-1 forms soot readily. This is because Naphthene and aromatic hydrocarbons form soot rapidly (condenstaion-polymerization) by directly condensing themselves into polycyclic aromatic hydrocarbons (PAH). On the other hand, paraffins form soot slowly. This is because paraffins have to be break up into smaller fragments first, from which fusing of the fragments occurs to form naphthenes and aromatics, and PAH's form eventually and indirectly (fragmentation-polymerization). 8,9 These PAH's, also known as soot precursors, are then undergone a series of physical processes to form coagulated soot panicles. Frenklach et al.20 developed a comprehensive soot formation mechanism in which 180 species and 619 elementary reactions are used in an attempt to describe the aforementioned soot formation processes. However, at the present moment, it is far too expensive to be incorporated into a CFD code while the oxidation of those 180 species was not even considered...
8Lawver, B. R., "Testing of Fuel/Oxidizer-Rich High-Pressure Preburners,Final Report, NASA CR-16544, NASA-Lewis Research Center, May 1982.
9Nickerson, G. R., and Johnson, C. W.,"A Soot Prediction Model for the TDK Computer Program," AIAA Paper 92-3391 ,July, 1992
20Frenklach, M., Clary, D. W., and Ramachandra, M. K., "Shock Tubes Study of the Fuel Structure Effects on the Chemical Kinetic Mechanisms Responsible for Soot Formation, Part2," NASA CR174880,May 1985.