NUMERICAL STUDY OF SYNGAS PREMIXED FLAME STRUCTURE AND EXTINCTION

This paper presents a numerical investigation of extinction limits (quenching and blow-off) and laminar flame speed for synthetic gas (syngas) premixed flame structure. These properties are important in premixed combustion which can be applied in gas turbines combustion chambers and burners design and modeling. Variations in syngas composition, the content of its dilution, and operating condition can have considerable impact on engine performance. Calculations are performed with using Davis et al. kinetics mechanism and a comprehensive study on effects of preheating temperature, composition, pressure, N2, and CO2 diluents are done for both properties. Counterflow premixed flame model is used for calculation of extinction limits. PREMIX code is used for laminar flame speed calculation and OPPDIF code for estimation of quenching and blow-off limits. Calculations show that with increasing preheating temperature, pressure, and decreasing the level of dilution with N2 and CO2, laminar flame speed increases and extinction limits (quenching and blow-off) become