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Fuel jet atomization using LEIS


Overview: Multiphase combustion in automotive industry as well as in propulsion of aerospace vessels is a critical issue since it directly controls pollution emissions. The same is true for land-based energy production systems like gas turbines. Apart from the environmental impact, reducing fuel consumption in these sectors has tremendous financial impact, too.

The challenge: Multiphase jets with large-scale motions are primarily responsible for the initial entrainment of ambient fluid and mixing of the species. As such, the design of better combustion systems require first that these flow are well understood, in particular when involving phase change, e.g. evaporation of fuel sprays in internal combustion engines. The available surface area at the interfaces separating the two immiscible fluids governs the amount of heat or chemical species exchanged. Therefore, knowledge of the size distribution of the fluid particles is critical to developing accurate predictive models of these processes.

TransAT Solution: TransAT using a model combination consisting of the mixture model and LES for turbulence turned out to be an excellent tool for the predicting the behavior of these large steam bubbles and their breakup, their rate of condensation in the pool, the currents induced in the surrounding liquid and the consequent mixing, including instantaneous forces on the pool structure. The model also needed compressibility effects – including capturing shocks- implemented within the multiphase flow context, which is a rather unique feature.

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Jan van Rickenbach
ASCOMP Switzerland
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