Laser-spectroscopic analysis of internal combustion engines

Laser-spectroscopic analysis of internal combustion engines 

Combustion processes are complex due to the very large diversity of chemical intermediates involved. Thus, a number of laser techniques, including LIF, Raman spectroscopy and Rayleigh scattering have been used to study combustion processes. Combustion in gasoline (petrol) and diesel engines has received particular attention, and we will focus on these studies to illustrate the use of lasers for combustion research. 

The main aim of these studies has been to improve combustion efficiency and to reduce the emission of pollutants. Specially modified engines have been designed with windows that allow laser radiation to enter and exit the combustion chamber, and to allow 

Laser Chemistry Spectroscopy, Dynamics and Applications Helmut H. Telle, Angel Gonzalez Urena Robert J. Donovan 2007 John Wiley Sons, Ltd ISBN 978-0-471-48570-4 (HB) ISBN 978-0-471-48571-1 (PB) 

The main challenge in combustion research lies in the need to make a large number of measurements simultaneously. First, it is essential to know how well the fuel and air are mixed, together with their spatial and temporal distributions in the combustion chamber. Second, the spatial and temporal variations in temperature must be measured. Third, the large number of chemical intermediates, whose concentration changes rapidly with time, has to be determined. 

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