Cell G - Spray Laboratory
In two spray chambers in the G-cell it is possible to study various properties and phenomena of fuel sprays. In direct injected engines are combustion and emissions controlled to a great extent by the characteristics of fuel sprays, which means that understanding of this is particularly important when it comes to modeling and designing internal combustion engines.
In an engine many parameters vary simultaneously, such as cylinder pressure, cylinder temperature, gas motion, turbulence, etc. When a fuel spray is injected under conditions similar to those of an internal combustion engine, it is difficult to see what affects what. This is where the benefits of a spray chamber come to its rights - we can freeze the ambient conditions and see the effect of varying one parameter at a time. In order to mimic, for an engine, real injection conditions is it necessary to be able to vary, especially, the ambient pressure, fuel pressure, ambient gas temperature and fuel temperature.
Properties that can be studied are droplet size distribution, spray penetration, fuel distribution, evaporation, velocity field, air entrainment, turbulence, mixing, formation of soot particles and interactions of spray/spray and spray/wall. The results of measurements of the spray chamber are used for both basic understanding of the sprays and as input for numerical simulations.
Last modified: May 27, 2010
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