Quantitative 2D LIF Measurements of Air/Fuel Ratios During the Intake Stroke in a Transparent SI Engine 922320
The fluorescence characteristics of different carbonyl compounds were investigated in a pressurized bomb using an excimer laser (308 nm) for excitation. The partial pressure of the carbonyl compounds and air was varied between 0 - saturation pressure and 0 - 5 bar, respectively. The fluorescence signal of different ketones increased almost linearly with vapour pressure. It was found to be almost independent of air pressure indicating only a weak quenching influence of oxygen. Ethylmethylketone (EMK) has a boiling temperature and vapour pressure similar to gasoline. Therefore, the applicability of EMK for measuring 2-D fuel distributions in a combustion chamber was tested in a transparent SI square piston engine. EMK was injected into the intake manifold by a conventional injector for studying the fuel/air mixing during the intake and compression stroke at 1.000 rpm. From the 2-D fluorescence signals 2-D air/fuel ratios were calculated using calibration data from bomb experiments.
Citation: Lawrenz, W., Köhler, J., Meier, F., Stolz, W. et al., "Quantitative 2D LIF Measurements of Air/Fuel Ratios During the Intake Stroke in a Transparent SI Engine," SAE Technical Paper 922320, 1992, https://doi.org/10.4271/922320. Download Citation
W. Lawrenz, J. Köhler, F. Meier, W. Stolz, R. Wirth, W. H. Bloss, R. R. Maly, E. Wagner, M. Zahn
University of Stuttgart, Daimler Benz AG
International Fuels & Lubricants Meeting & Exposition
SAE 1992 Transactions: Journal of Engines-V101-3