Investigation of the Effect of Pre-Heat Multi-Regions in Counterflow Combustion of Premixed Particle-Cloud

In this paper, the structure of lycopodium volatile particles flame is analytically studied in counterflow configuration. In this investigation, it is presumed thatthe gaseous fuel, produced from vaporization of the fuel particles, oxidizes in the gas phase and the fuel particles do not participate in the reaction. The structure of flameis considered to have three zones including the pre-heat zone, the asymptotically thin reaction zone and postflame zone. Also, uniformly dispersed particles in the gas phase passes throughout four sub-regions in preheat zone including; first pre-heat sub-region, dryingsub-region, second pre-heat sub-region and vaporization (devolatilisation) sub-region, respectively. The analysis is carried out in the asymptotic limit and one-stepchemical reaction is assumed. The flame position is determined and the effect of Lewis number change andsub-regions in pre-heat zone on the gaseous fuel massfraction and fuel particles mass fraction distribution is investigated. Also, the effect of volatile temperature isstudied on the gaseous fuel mass fraction versus nondimensional length.

Keywords:

Particle-cloud , Counterflow combustion , Multi-regions , Drying , Vaporization of volatile particles