Investigation of the effect of water-in-fuel emulsion spray on an edge flame

Water-in-fuel emulsion droplets are comprised of an inner water droplet immiscible with, and surrounded by, an outer liquid fuel layer. As part of the worldwide effort to reduce pollution emissions from combustion processes, the use of such liquid droplets is considered as a means to increase combustion efficiency and reduce pollutants emissions from existing power systems. This is achieved mainly due to a reduction in the burned gas temperature induced by the water content and to secondary droplet atomization, as parent droplets micro-explode producing faster-evaporating smaller offspring droplets, leading to better mixing.

In the current work, a new two-dimensional thermal-diffusional model is formulated to describe the edge flame formed by two laminar co-flowing streams, one of an oxidant and the other of fuel vapor and water-in-fuel emulsion droplets, separated initially by a splitter plate. A numerical investigation was performed of how the initial presence of the water-in-fuel droplets and their micro-explosions effect the thermal structure of the compound flame in the mixing layer downstream of the splitter plate. Trends were identified that, among others, relate the temperature of different flame zones, flame location and stability, to the percentage and properties of the water in the emulsion droplets. These findings contribute to understanding the potential working conditions, pros and cons of water-in-fuel emulsions.

Mon, 24-10-2022, 13:30-14:30 (Gathering at 13:30)
Classroom 165, ground floor, Library, Aerospace Eng.
ZOOM: https://technion.zoom.us/j/98800929742
Light refreshments will be served before the lecture