Date of Award


Publication Type

Master Thesis

Degree Name



Mechanical, Automotive, and Materials Engineering


Applied sciences


David S-K Ting




Nonpremixed turbulent combustion is a prevalent phenomenon in many practical applications. Theoretical research like simulating a well quantified piloted methane/air jet flame can serve as a means to make this technology effective, economical and clean. In this work, a Masri-Bilger piloted methane/air jet flame has been modeled by invoking the laminar flamelet assumption in FLUENT. The purpose was to investigate the effects of chemical reaction mechanisms and scalar dissipation rates on the accuracy of the model. Smooke's skeletal mechanism with 17 species and 25 reactions has been compared with GRI-Mech 3.0, a detailed mechanism consisting of 53 chemical species and 325 elementary reactions. The scalar dissipation rate was varied from 0.001 to 20 s -1. The results confirm the ability of the steady laminar flamelet model in qualitatively predicting the non-premixed, turbulent jet flame in terms of temperature and species profiles. The inclusion of detailed chemistry only led to marginally improved prediction. Scalar dissipation rate has a more pronounced influence on the predicted results, indicating that an appropriate nonzero dissipation rate is needed to better capture the underlying physics.