Effect of ammonia addition on laminar burning velocity of CH4/H2 premixed flames at high pressure and temperature conditions

Laminar Burning Velocity Measurement of CH4/NH3/H2–Air Premixed Flames under Engine Relevant Conditions

“…The production/dissipation rates of important species through their flux strength in a chemical reaction are characterized using the reaction pathway diagram (RPD) which is also defined in our previous work. , Flux strength of an individual element such as nitrogen, hydrogen, and so forth, is regulated by the thickness of arrows for illustrating fuel oxidation via definitive path. Cantera software with python script and Graphviz tool is utilized for the RPD of hydrogen flux.…”

“…Quartz is utilized in fabricating the diverging channel as it accustoms thermo-physical characteristics like low thermal conductivity, wall transparency, and high specific heat capacity for an extensive temperature domain. The relevant information regarding the diverging channel is mentioned in our previous studies. , The uniform temperature distribution is obtained along the channel’s axial length resonating the Hele-Shaw flow. , The divergence of 10 0 was maintained to reduce the modes of partially unstable flames with optimum oscillation frequency . This divergence creates a negative velocity gradient, and an increasing wall-temperature gradient is generated by the external heater accompanying fluid flow.…”

Data-Driven Prediction of Laminar Burning Velocity for Ternary Ammonia/Hydrogen/Methane/Air Premixed Flames

“…Detailed chemical kinetic mechanisms were compared [16][17][18] and it was reported that the Li mechanism [18] provided the best LBV computation for ternary blends, increasing accuracy was observed with increased NH 3 content. More recently, Berwal et al [13] investigated the LBV of ternary NH 3 /CH 4 /H 2 /air blends at elevated temperature and pressure conditions, extending their previous work to 5 bar. It was noted that the LBV for the ternary mixtures would be comparable to that of CH 4 /air at 5 bar.…”

“…The following conditions are identified as under-represented according to Fig. 3 this work, the mechanism by Li et al [18] is used for simulating ternary NH 3 /H 2 /CH 4 /air mixtures since it was tested and reported to be highly accurate by Yasiry et al [15] and Berwal et al [13].…”