Two-tracer LIF imaging of preferential evaporation of multi-component gasoline fuel sprays under engine conditions

Lama M. Itani (1, 2, 3) , Gilles Bruneaux (1, 3) , Angela Di Lella (3) , C Schulz (2)

1 IFPEN - IFP Energies nouvelles
2 Universität Duisburg-Essen = University of Duisburg-Essen [Essen]
3 Ecole Centrale Paris

A laser-induced fluorescence (LIF) technique capable of assessing the effects of preferential evaporation of multi-component fuels was developed based on the simultaneous detection of two aromatic fluorescence tracers with complementary evaporation characteristics. Preferential evaporation is determined from the LIF-signal intensity ratio measured within two distinct spectral bands. A scheme to determine the measurement accuracy and precision was established by characterizing the collection setup through determining the ratio of LIF intensities collected within two identical spectral bands. Measurements were performed in a high-pressure, high-temperature vessel equipped with a hollow-cone injector. Experimental conditions were chosen that are representative for engine environments and favor preferential evaporation. The analysis of the preferential evaporation was based on the comparison of instantaneous and mean images of LIF ratios obtained at various temperatures. Inhomogeneous distributions of the fuel volatility classes as a consequence of preferential evaporation were observed and two-dimensionally imaged at ambient temperatures up to 550 K.

Mots clés: Multi-component fuel; gasoline sprays; preferential evaporation; laser-induced fluorescence 3

Domaines: Autre

Lama M. Itani, Gilles Bruneaux, Angela Di Lella, C Schulz. Two-tracer LIF imaging of preferential evaporation of multi-component gasoline fuel sprays under engine conditions. Proceedings of the Combustion Institute, 2015, 35, pp.2915-2922. ⟨10.1016/j.proci.2014.06.108⟩. ⟨hal-01121161⟩