Effects of ambient pressure, gas temperature and combustion reaction on droplet evaporation

Abstract

The effects of ambient pressure, initial gas temperature and combustion reaction on the evaporation of a single fuel droplet and multiple fuel droplets are investigated by means of three-dimensional numerical simulation. The ambient pressure, initial gas temperature and droplets' mass loading ratio, M L, are varied in the ranges of 0.1-2.0 MPa, 1000-2000 K and 0.027-0.36, respectively, under the condition with or without combustion reaction. The results show that both for the conditions with and without combustion reac

Analytical and numerical studies on a single-droplet evaporation and combustion under forced convection

“…Numerical simulations of droplet evaporation and combustion have recently been reported in Refs. [5][6][7]. Awasthi et al [5] simulated the effect of ambient temperature and initial droplet size on the combustion of a heptane droplet.…”

“…In that study there was no forced convection, and only a spherical flame was considered. Kitano et al [6] simulated singleand multiple-droplet combustion using a given evaporation model to study the effect of ambient pressure and gas temperature on droplet evaporation. In these two papers, no detailed information on gas flows, species concentration, or gas temperature distributions surrounding the droplets was reported.…”

Evaporation and combustion of multicomponent fuel droplets

“…The set of governing equations of the carrier gas and dispersed droplets phases and the numerical procedure are described in our previous paper [27]. To remove grid resolution dependency, source terms for gas phase are calculated for cells surrounding each droplet by using distance function from droplet position [17].…”

“…The computational domain is a cube 4.8 mm on a side and divided into 48 uniform computational grid points in each direction. This grid resolution is determined based on our previous study [27].…”

“…For the calculation of the reaction, 113 species and 891 reactions for the one-and two-component fuels and 273 species and 2322 reactions for the three-component fuel are considered, respectively. The ambient pressure ranges from 0.1 MPa to 1.0 MPa, and the evaporation model for the multicomponent fuels in the high pressure conditions is extended based on our previous work (Kitano et al [27]). …”