کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1240343 | 1495724 | 2012 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Laser-induced breakdown spectroscopy for lambda quantification in a direct-injection engine Laser-induced breakdown spectroscopy for lambda quantification in a direct-injection engine](/preview/png/1240343.png)
We apply laser-induced breakdown spectroscopy (LIBS) to determine local lambda values (i.e. the normalized air-fuel mass ratio) at the ignition location λip in a direct-injection single-cylinder optical research engine. The technique enables us to determine variations of λip for different fuel injection strategies, as well as correlations between variations in λip and the combustion dynamics. In particular we observe, that fluctuations in λip are not the major cause of cycle-to-cycle variations in the combustion process. Moreover, our experiments identify insufficient lean λip 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 λ distribution. These results demonstrate the potential of LIBS to monitor λ values during mixture formation in gasoline engines.
► Determination of λ values by means of LIBS in an optical gasoline engine.
► Evaluation of λ fluctuations for different fuel injection strategies.
► Investigation of the effect of λ upon combustion dynamics.
► Combination of LIBS and LIF to obtain two-dimensional λ distributions.
Journal: Spectrochimica Acta Part B: Atomic Spectroscopy - Volumes 74–75, August–September 2012, Pages 103–108