Visualization of Diesel Spray Penetration, Cool-Flame, Ignition, High-Temperature Combustion, and Soot Formation Using High-Speed Imaging 2009-01-0658
Shadowgraph/schlieren imaging techniques have often been used for flow visualization of reacting and non-reacting systems. In this paper we show that high-speed shadowgraph visualization in a high-pressure chamber can also be used to identify cool-flame and high-temperature combustion regions of diesel sprays, thereby providing insight into the time sequence of diesel ignition and combustion. When coupled to simultaneous high-speed Mie-scatter imaging, chemiluminescence imaging, pressure measurement, and spatially-integrated jet luminosity measurements by photodiode, the shadowgraph visualization provides further information about spray penetration after vaporization, spatial location of ignition and high-temperature combustion, and inactive combustion regions where problematic unburned hydrocarbons exist. Examples of the joint application of high-speed diagnostics include transient non-reacting and reacting injections, as well as multiple injections. Shadowgraph and schlieren image processing steps required to account for variations of refractive index within the high-temperature combustion vessel gases are also shown.
Citation: Pickett, L., Kook, S., and Williams, T., "Visualization of Diesel Spray Penetration, Cool-Flame, Ignition, High-Temperature Combustion, and Soot Formation Using High-Speed Imaging," SAE Int. J. Engines 2(1):439-459, 2009, https://doi.org/10.4271/2009-01-0658. Download Citation
Lyle M. Pickett, Sanghoon Kook, Timothy C. Williams
Sandia National Laboratories
SAE World Congress & Exhibition
Combustion and Flow Diagnostics and Fundamental Advances in Thermal and Fluid Sciences, 2009-SP-2238, SAE International Journal of Engines-V118-3, SAE International Journal of Engines-V118-3EJ