Effects of substituting fuel spray for fuel gas on flame stability in lean premixtures

Rich spray-flame propagating through a 2D­Lattice of alkane droplets in air

“…In the recent years, this property allowed us to resort to a homogenization process for developing an appropriate numerical modelling [22,[26][27]. In such an approach which also neglects droplet inertia, liquid fuel appears as an additional species only allowed to enter into the chemical scheme after a vaporization step.…”

“…Several spreading regimes have been predicted [22], in particular an intrinsic oscillatory regime, which had been observed experimentally by Hanai et al [28] and by Atzler [13]. The existence of this regime, which occurs as a Hopf bifurcation, does not require the presence of differential diffusivity effects [26][27].…”

Oscillatory Propagation of a Rich Premixed Spray Flame

“…That study concentrated on fuel rich laminar premixed spray flames and its purpose was to attempt to replicate some of their aforementioned peculiar phenomena by numerical means. Whereas previous stability analysis [10][11][12][13], aimed at predicting mathematically the aforedescribed cellularization and pulsating behavior, were predicated on linearization, the numerical study of [9] dispensed with this restriction by retaining the important non-linear terms and was indeed able, in a limited qualitative way, to predict what had been previously observed independently in the laboratory.…”

Propagation of Rich Premixed Polydisperse Spray Flames

“…A comprehensive review of background material consisting of previous experimental and theoretical studies on laminar premixed spray flames was given in [9] and repetition of this material here is superfluous. It should be noted that previous stability analyses [10][11][12][13], aimed at predicting mathematically the aforedescribed cellularization and pulsating behaviour, were predicated on linearization, whereas the numerical study of [9] was free of linearization and retained the important non-linear terms, thereby enabling, in a limited qualitative way, prediction of what had been previously observed independently in the laboratory.…”