Effect of inert gas on turbulent burning velocities

In our previous works, the preferential diffusion effect was found to play an important role in premixed turbulent combustion characteristics, where n itrogen was added as an inert gas to several fuel/oxygen mixtures. In this study, the inert gas is changed to Ar, He and CO2, and the relationship bet ween the turbulent burning velocity and the diffusion coefficient of each i nert gas in the multi-component mixture is examined experimentally. As a re sult, Ar and CO2 added mixtures show slightly larger turbulent burning velo cities than that of nitrogen added mixtures. On the contrary, He added mixt ures show very smaller turbulent burning velocities at the same equivalence ratio. These characteristics are discussed in connection with each diffusi on coefficient of fuel, oxygen and inert gas in multi-component system.