Combustion Regime Visualization

The movies in this section were generated to provide an overview of comparisons of in-cylinder spray, ignition, and natural luminosity characteristics among several internal engine combustion modes. All data were acquired in the same platform, the Heavy-Duty Low-Temperature Combustion/Diesel Combustion lab. For all movies in this section, the engine was equipped with a side-mounted 100-bar gasoline direct injector delivering neat iso-octane during the early intake stroke to create a relatively well mixed iso-octane charge at ignition (for SI, HCCI, and RCCI), and a 300-2000 bar common-rail injector delivering n-heptane (for DICI, PCI, MK, HCCI, and RCCI). Sprays were illuminated using a high-power LED source, and the combustion luminosity is primarily chemiluminescence for all movies except the DICI, for which the combustion luminosity is primarily natural soot incandescence.

The following links demonstrate how various parameters affect combustion:

Conventional Combustion: Spark Ignition (SI - gasoline)

Conventional Combustion: Direct-Injection Compression Ignition (CI - diesel)

Low-Temperature Combustion (LTC): Premixed Compression Ignition (PCI - early injection)

Low-Temperature Combustion (LTC): Modulated Kinetics (MK - late injection)

Low-Temperature Combustion (LTC): Homogeneous Charge Compression Ignition (HCCI)

Low-Temperature Combustion (LTC): Reactivity Controlled Compression Ignition (RCCI)

Credits go to Mark Musculus