Extinction Studies Of Furanic Fuels Using Counterflow Diffusion Flames

抄録

The potential of 2,5 dimethylfuran (DMF) and methyl furan (MF) as an alternative transport fuel is on the rise due to the recent breakthroughs in their production. Researchers are currently involved in understanding combustion characteristics such as flame speed, ignition delay, emissions etc. This study reports the extinction strain rate measurements in counterflow diffusion flame burner for three fuels - DMF, MF and iso-octane. The fuels are pre-evaporated and injected into one of the nozzles of a specially -designed counterflow burner using heated nitrogen as carrier gas. The temperature of the fuel and oxidizer (air) streams are maintained at 373 K and 300 K, respectively. The volumetric fuel loading in nitrogen carrier gas is varied from 10% to 25%. Extinction strain rates for DMF/air flames are found to be lower than those for iso-octane/air flames at all fuel loadings. On the other hand, extinction strain rates for MF/air flames are similar to those for iso-octane/air flames at fuel loadings lower than 15% but tend to be greater at higher fuel loadings. The extinction strain rates for MF/air flames vary from 120 s^-1 to 300 s^-1, while for DMF flames they vary from 100 s^-1 to 220 s^-1. The measurements reported in this work serve to validate and optimize kinetic mechanisms. Further, the results are interpreted not only in terms of the chemistry, but also in terms of the diffusivities of larger intermediate species, especially in iso-octane and DMF flames.