Linear stability analysis of laminar premixed water-in-fuel emulsion spray flames

Yokev, Neta; Greenberg, J.B.

doi:10.1016/j.fuel.2018.02.113

Cited by 8 publications

(4 citation statements)

References 29 publications

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“…In recent work [10][11][12][13][14][15], water-in-fuel (WIFE) emulsion spray flames were considered theoretically. The droplets themselves were taken to be comprised of an outer layer of liquid fuel immiscible with an inner sphere of water.…”

Section: Introductionmentioning

confidence: 99%

“…This provides a sufficiently significant heat sink for temperature reduction which, if correctly controlled, lowers the onset of cracking of liquid phase hydrocarbons within the droplet and thereby reduces the formation of particulate matter [17,18]. The latent heat discrepancy also has a strong effect on the laminar flame speed [10][11][12][13] and flame stability [14,15], depending on the relative amount of water in the droplets and the location of onset of pure water evaporation.…”

Section: Introductionmentioning

confidence: 99%

“…Comprehensive literature surveys can be found in [14,15] and the review paper by Jhalani et al [19], the latter having covered over 100 published works in this field. The interested reader is referred to those works for more background material on the topic at hand.…”

Section: Introductionmentioning

confidence: 99%

“…In previous theoretical research [10][11][12][13][14][15] the type of water-in-flame spray flames considered was taken to be premixed, due to their applicability in realistic combustion systems. However, non-premixed spray flames are also of practical relevance in modern aircraft jet engines which are designed with lean-burn combustion (see, for example, [31] and references therein).…”

Section: Introductionmentioning

confidence: 99%

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Micro-explosion effects in a laminar water-in fuel spray diffusion flame

Greenberg

Shpitz

2020

Combustion Theory and Modelling

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In this work, we formulate a simple one-dimensional model as a framework for studying the influence of water-in-fuel emulsions on spray diffusion flames. The special contribution of these emulsions to combustion is examined via the relevant steady state equations, which are solved both analytically, when the chemical Damköhler number becomes infinitely large, and numerically when it is finite. Two possible scenarios are investigated; the first, when no micro-explosions occur. The second is when conditions are met for droplet micro-explosions to happen, an occurrence that has been independently observed. The leading order analytical solutions indicate that, as far as the fuel vapour and temperature profiles are concerned, any differences between the case of occurrence and non-occurrence of micro-explosions is fairly minor. However, the numerical solutions showed that in both scenarios the range of permissible values of supply stream mass flux for which spray diffusion flames can be established is considerably reduced by the presence of the water in the droplets. This effect is magnified greatly when micro-explosions take place, primarily due to the focused heat loss for droplet evaporation which entails as the water vapour is released and the evaporation rate of the small droplets created by the micro-explosions is enhanced.

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