Study on the Turbulent Burning Velocity of Hydrogen Mixtures Including Hydrocarbon

Abstract

To clarify the turbulent burning velocity of hydrogen in the presence of hydrocarbons, a two-component fuel mixture of hydrogen, methane, and propane was considered. Both hydrocarbon fuel-lean and fuel-rich mixtures were prepared while keeping the laminar burning velocity approximately constant. Even though the laminar burning velocities were approximately the same, a distinct difference in the measured turbulent burning velocity at the same turbulence intensity is observed, depending on the addition of hydrocarbon, the equivalence ratio, and the kind of hydrocarbon. The burning velocities of lean mixtures changed almost monotonically as the rate of addition changed, whereas the burning velocities of the rich mixtures showed no such tendency. This trend can be explained qualitatively based on the mean local burning velocity, which is estimated by taking into account the preferential diffusion effect for each fuel component.