Laminar Burning Velocities of Diluted Hydrogen−Oxygen−Nitrogen Mixtures

Abstract

Measurements of laminar adiabatic burning velocities of flames propagating in hydrogen−oxygen−nitrogen mixtures at atmospheric pressure are presented and analyzed in this study. The oxygen content in the oxidizer (nitrogen−oxygen mixture) was varied between 0.07 and 0.1 (7−10 volume percent) at an equivalence ratio of 1.058. Besides the variation in oxygen content a variation in equivalence ratio from 0.7 to 3.1 and from 0.7 to 0.95 is presented at oxygen contents of 0.077 and 0.1077, respectively. The heat flux method was used to determine burning velocities under conditions where the net heat loss of the flat stretchless flame to the burner is zero. The resulting adiabatic burning velocities are presented with error margins using a 95% confidence interval. A significant difference was found when comparing the present results with experimental data from the literature.

Experimental and Computational Determination of LBV of Hydrogen Enriched Methane Mixtures

“…So, some other appropriate reaction mechanism may be used for the computational simulations. Hermanns [13] have conducted experiments at 298 K. So, the experimental results of Hermanns are higher than th e experimental results of the present work which is c arried at 292 K. It has been predicted that 4 0 C increase in temperature increases the LBV by roughly 1 cm/s. …”

Effects of pressure and carbon dioxide, hydrogen and nitrogen concentration on laminar burning velocities and NO formation of methane-air mixtures

“…The length of calculations have been regarded 2 cm before the spot of reaction or generally equal to 12 cm. The conservation of mass is expressed by the general continuity equation [10]:…”

“…(6) with Ns the number of species. This leads to a conservation equation for every species mass fraction in the mixture [10]:…”

“…Faster burning in SI engines leads to a more robust and repeatable combustion and permits engine operation with substantially larger amount of exhaust gas recirculation (EGR), bringing the reduction in NOX emission [9]. Enrichment of Methane fuel by hydrogen, nitrogen and carbon dioxide has been investigated by many researchers through experimental methods [10,11], and the studies have indicated that laminar burning velocity of Methane-Hydrogen mixture will be increased, by increase of hydrogen fractional ratio [11,12]. This paper is an experimental research indicating the effect of dilution of Methane-air mixture with N2, CO2 and also numerically with H2 on flame burning velocity.…”

Numerical Simulations of Flat Laminar Premixed Methane-Air Flames at Elevated Pressure

“…An experimental study was performed by Hermanns (2007) at ambient conditions by using a gold-coated burner plate and a conventional brass burner plate. It was observed that the laminar burning velocity was not influenced.…”