Investigation of Mixture Formation in Diesel Sprays under Quiescent Conditions using Raman, Mie and LIF Diagnostics 2008-01-0945
Mixture formation plays an important role for combustion and pollution formation in Diesel sprays. In particular air/fuel ratio (AFR) and temperature of the mixture short before ignition are crucial for these processes. Thus, these two quantities were measured quantitatively using 1-d spontaneous Raman scattering in this work. In addition, 1-d and 2-d Mie scattering was applied to visualize the distribution of the fuel droplets. 1-d and 2-d laser induced fluorescence (LIF) was also used to measure oxygen and fuel in a qualitative way in this work. The common rail Diesel injector was installed in a combustion vessel, in order to provide nearly quiescent high-pressure and high-temperature conditions. N-decane was used as the fuel, because it is a commonly used model fuel for standard Diesel fuel. It was doped with three different tracers with different boiling points in consecutive experiments in the case of 2-d LIF measurements. The Diesel spray is analyzed by combining the qualitative 2-d Mie and LIF images with the quantitative 1-d air/fuel ratio and temperature profiles measured by Raman scattering.
Citation: Hoffmann, T., Hottenbach, P., Koss, H., Pauls, C. et al., "Investigation of Mixture Formation in Diesel Sprays under Quiescent Conditions using Raman, Mie and LIF Diagnostics," SAE Technical Paper 2008-01-0945, 2008, https://doi.org/10.4271/2008-01-0945. Download Citation
T. Hoffmann, P. Hottenbach, H.-J. Koss, C. Pauls, G. Grünefeld
RWTH Aachen University
SAE World Congress & Exhibition
Diesel Fuel Injection and Sprays, 2008-SP-2183