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Piston Wetting in an Optical DISI Engine: Fuel Films, Pool Fires, and Soot Generation.


DE2001772346

Publication Date 2001
Personal Author Stevens, E.; Steeper, R.
Page Count 10
Abstract Piston-wetting effects are investigated in an optical direct-injection spark-ignition (DISI) engine. Fuel spray impingement on the piston leads to the formation of fuel films, which are visualized with a laser-induced fluorescence (LIF) imaging technique. Oxygen quenching is found to reduce the fluorescence yield from liquid gasoline. Fuel films that exist during combustion of the premixed charge ignite to create piston-top pool fires. These fires are characterized using direct flame imaging. Soot produced by the pool fires is imaged using laser elastic scattering and is found to persist throughout the exhaust stroke, implying that piston-top pool fires are a likely source of engine-out particulate emissions for DISI engines.
Keywords
  • Spark ignition engines
  • Pistons
  • Combustion
  • Elastic scattering
  • Engines
  • Flames
  • Fluorescence
  • Gasoline
  • Impingement
  • Lasers
  • Oxygen
  • Particulates
  • Quenching
Source Agency
  • Technical Information Center Oak Ridge Tennessee
Corporate Authors Sandia National Labs., Albuquerque, NM.; Department of Energy, Washington, DC.
Document Type Conference Proceedings
NTIS Issue Number 200211
Contract Number
  • AC04-94AL85000
Piston Wetting in an Optical DISI Engine: Fuel Films, Pool Fires, and Soot Generation.
Piston Wetting in an Optical DISI Engine: Fuel Films, Pool Fires, and Soot Generation.
DE2001772346

  • Spark ignition engines
  • Pistons
  • Combustion
  • Elastic scattering
  • Engines
  • Flames
  • Fluorescence
  • Gasoline
  • Impingement
  • Lasers
  • Oxygen
  • Particulates
  • Quenching
  • Technical Information Center Oak Ridge Tennessee
  • AC04-94AL85000
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