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article imageDutch Scientist Creates Hyper Efficient Diesel Filtering Technology Using Laser Beams

By Angelique van Engelen     Dec 23, 2007 in Technology
A Dutch researcher has developed a laser system to investigate soot development in diesel engines which uses Laser Induced Incandescence (LII) which eliminates soot right where it's generated.
Small soot particles are not retained by a soot filter but are, however, more harmful than larger soot particles. Therefore, soot development needs to be tackled at the source, says the inventor, Bas Bougie.
His LLI technology can be used by project partners to develop cleaner diesel engines. Measuring soot formation in a diesel engine is far from easy, says Bougie. "Due to the turbulent environment in the combustion cylinder, no two combustion cycles are the same", he says. The measurements are also difficult to reproduce as the pressure at which fuel is injected into the cylinder causes an extra source of turbulence.
Bougie made his measurements in a glass cylinder with an engine adapted for this purpose. Laser Induced Incandescence (LII) can be used to investigate optimal engine conditions that reduce soot emission from the engine, he says. LII can be deployed in different types of engines and with different fuels.
Bougie carried out measurements during higher and lower loading of the engine and for two different fuel injection systems: a line pump system and a common rail system. Neither the engine load nor the injection system was found to affect the primary particle size of the soot emitted. However, there are many other motor settings that can lead to an improvement in the combustion.
The results of the measurements can now be used to verify existing combustion models at Eindhoven University of Technology. The department will investigate further improvements to the measuring system with the ultimate objective of producing cleaner diesel engines collaborating with various other parties, including DAF, TNO, Shell, Cyclone Fluid dynamics, EP Controls, all from the Netherlands as well as the Swiss Paul Scherrer Institute.
Bougie's doctoral research was part of a programme of the Institute for Molecules and Material (IMM) of the Radboud University Nijmegen.
Bas Bougie’s research was funded by Technology Foundation STW.
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