Influence of chemical reaction mechanism on turbulent jet flame

Turbulent combustion is extensively employed in industry and transportation, where the flow and chemical reactions are intricately interconnected. Due to the complexity of this coupling mechanism, it is essential to incorporate the chemical reaction mechanism in combustion simulations. However, there are many kinds and quantities of chemical reaction mechanisms, and the choice of mechanism has great influence on the simulation results. In this article, 11 distinct chemical reaction mechanisms were chosen and their reaction kinetics examined in order to investigate the impact of chemical reaction mechanisms on the simulation of turbulent jet flame. Then Sandia Flame D turbulent jet flame was selected as the research object, and the temperature and component concentration data after calculation and stability were extracted for comparative analysis. The findings demonstrate the stark differences in the kinetic performance of several chemical processes. The ignition delay time of the global mechanism JL4 is too short due to the omission of too many intermediate species. The ignition delay time of the SMOOKE mechanism and the z42 mechanism is longer than the experimental value due to the omission of multi-carbon species. As the flow field develops, the disparity between the computation outputs of various methods grows. Whereas the difference away from the fuel inlet is mostly caused by the various species and elementary processes involved in various chemical reaction mechanisms, the difference near the fuel inlet is primarily caused by the difference in kinetic performance. For all chemical mechanisms, there is a tendency that the more species used in the chemical reaction, the more concentrated the region of high heat release rate, the shorter the flame length, and the higher the maximum temperature throughout the field.