Laminar-burning velocities of hydrogen–air and hydrogen–methane–air mixtures: An experimental study

Ignition delay times, laminar flame speeds, and mechanism validation for natural gas/hydrogen blends at elevated pressures

“…The effect of hydrogen addition to methane and natural gas has been shown to vary with the amount of higher-order hydrocarbons in the natural gas, the equivalence ratio (φ), and the pressure [31,32]. However, putting together a test list covering a wide range of pressures, % hydrogen, stoichiometry, and fuel blend could prove a huge task due to the large number of possible combinations.…”

A Review of Hydrogen-Natural Gas Blend Fuels in Internal Combustion Engines

“…Many studies have been carried out to measure the flame speed of hydrogen-methane air mixtures at different hydrogen concentrations and equivalence ratios. Ilbas et al (2006) performed the measurements at ambient temperatures with hydrogen-methane blends up to 100% hydrogen. Fig.…”

“…2. Flame speed of different fuels versus equivalence ratio φ (Ilbas et al, 2006). Figure 2 shows the flame speed for methane and a 50% hydrogen-methane blend plotted versus the equivalence ratio.…”

Use of Hydrogen-Methane Blends in Internal Combustion Engines

“…It indicated that the addition of hydrogen could increase the flame propagation speed, thus stabilizing the combustion process, especially the lean combustion process [43]. Ilbas et al [44] experimentally studied the laminar burning velocities of hydrogen-air and hydrogenmethane-air mixtures. They concluded that increasing the hydrogen percentage in the hydrogen-methane mixture brought about an increase in the resultant burning velocity and caused a widening of the flammability limit ( Figure 6).…”