A numerical modelling of an influence of CH4, N2, CO2 and steam on a laminar burning velocity of hydrogen in air

Additive Effects on the Burning Velocity of Ethylene–Air Mixtures

“…The plots in Figures and are linear only at low additive concentrations, below 10 vol %, in agreement with previous data found for other fuel–air–additive systems, e.g., syngas (50% H 2 and 50% CO)–air–N 2 , dissociated methanol (66.7% H 2 and 33.3% CO)–air–N 2 , propane–air–N 2 , , or methane–hydrogen–air–N 2 . Dilution by CO 2 has a greater impact on laminar flame speed in comparison to N 2 and Ar, as observed for many other fuel–air–additive mixtures. − ,, Dilution of ethylene–air mixture has, as a first consequence, the diminution of fuel and oxygen contents and the amount of evolved heat, able to sustain the flame propagation. As a consequence, both the maximum flame temperature in the reaction zone and the burning velocity decrease.…”

“…The interest toward the development and improvement of detailed mechanisms of hydrocarbon oxidation at high temperatures prompted numerous experimental studies on flames in various conditions, either deflagrations propagating in laminar conditions or self-ignitions in shock tubes. The mechanism validation could be made by a comparison between the computed and measured values of a few global parameters, such as the normal burning velocity and/or the ignition delay and ignition temperature, for representative fuels under extensive variations of the thermodynamic parameters. − …”

Kinetic and dynamic analysis of hydrogen-enrichment mixtures in combustor systems – A review paper

“…With addition of lower concentrations of hydrogen 2. With addition of higher concentrations of hydrogen at temperature lower than 1050°K [7,43,[45][46][47]64,81,84] [5,10,54] [9,42,45,46] [6]…”

“…-The mole fraction, equivalence ratio, initial pressure and initial temperature unify the effects of enriched hydrogen on the mentioned parameters [39]as well as the optimum ignition timing [7,50,52,68,71,80,89] [ 8,9,35,[37][38][39][40]42,43,45,46,50,51,64,81,84,111] values as shown in Fig. 1b and c. For instance, presence of N 2 and CO in CH 4 -H 2 and C 3 H 8 -H 2 mixtures in constant initial pressure declines the burning velocity up to two times at the same equivalence ratio.…”

“…The results show that the unstretched flame propagation speed [7,43,[45][46][47]84] and laminar burning velocity [43,64,81,84] increased parallel to any increase in the initial temperature [37][38][39]43,50,64,81] and hydrogen fraction [8,9,[37][38][39]42,43,45,46,84]. However, the values declined with an increase in the initial pressure, as this condition will reduce the H and OH radical concentrations at elevated pressures [8,9,37,39,42,50].…”