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Laser-induced breakdown spectroscopy for lambda quantification in a direct-injection engine
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DOI：10.1016/j.sab.2012.06.051.png)
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We apply laser-induced breakdown spectroscopy (LIBS) to determine local lambda values (i.e. the normalized air-fuel mass ratio) at the ignition location lambda(ip), in a direct-injection single-cylinder optical research engine. The technique enables us to determine variations of lambda(ip) for different fuel injection strategies, as well as correlations between variations in lambda(ip) and the combustion dynamics. In particular we observe, that fluctuations in lambda(ip) are not the major cause of cycle-to-cycle variations in the combustion process. Moreover, our experiments identify insufficient lean lambda(ip) values as a source of misfires in lean combustions. In a combination of LIBS with laser-induced fluorescence (LIF), we obtain additionally information about the two-dimensional lambda distribution. These results demonstrate the potential of LIBS to monitor h values during mixture formation in gasoline engines. (C) 2012 Elsevier B.V. All rights reserved.
Keyword:
LIBS
LIF
Combustion processes
Air-fuel ratio
期刊
IF:
3.8
论文数:
5.2K
被引数:
8.8K
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