An Experimental Investigation of Low-Soot and Soot-Free Combustion Strategies in a Heavy-Duty, Single-Cylinder, Direct-Injection, Optical Diesel Engine

High-efficiency, clean-combustion strategies for heavy-duty diesel engines are critical for meeting stringent emissions regulations and reducing the costs of aftertreatment systems that are currently required to meet these regulations. Results from previous constant-volume combustion-vessel experiments using a single jet of fuel under quiescent conditions have shown that mixing-controlled soot-free combustion (i.e., combustion where soot is not produced) is possible with #2 diesel fuel. These experiments employed small injector-orifice diameters (? 150 µm) and high fuel-injection pressures (? 200 MPa) at top-dead-center (TDC) temperatures and densities that could be achievable in modern heavy-duty diesel engines. The present study examines the feasibility of mixing-controlled low-soot and soot-free combustion strategies using multi-hole injector tips in a 1.72-liter single-cylinder version of a heavy-duty diesel engine that has been modified to provide extensive optical access to the combustion chamber. Indicated-specific emissions, high-speed images of in-cylinder natural luminosity and OH*-radical chemiluminescence, and indicated efficiency measurements were acquired over parametric sweeps of injection pressure, number of injector-tip orifices, quantity of injected fuel, start of combustion, TDC density, TDC temperature, and mixture composition. These measurements indicate that sustaining soot-free combustion over the entire duration of combustion is limited by jet-jet interactions and the re-entrainment of hot combustion products into each fuel jet near its flame lift-off length. Nevertheless, significant reductions in engine-out smoke levels are possible even if soot-free combustion is not sustained.

• Record URL:
  • https://doi.org/10.4271/2011-01-1812
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/19463952
• Supplemental Notes:
  • Abstract reprinted with permission of SAE International.
• Authors:
  • Polonowski, Christopher J
  • Mueller, Charles J
  • Gehrke, Christopher R
  • Bazyn, Tim
  • Martin, Glen C
  • Lillo, Peter M
• Conference:
  • SAE International Powertrains, Fuels and Lubricants Meeting
  • Location: Kyoto , Japan
  • Date: 2011-8-30 to 2011-9-2
• Publication Date: 2011-8-30

Language

• English

Media Info

• Media Type: Web
• Features: Figures; References; Tables;
• Pagination: pp 51-77
• Serial:
  • SAE International Journal of Fuels and Lubricants
  • Volume: 5
  • Issue Number: 1
  • Publisher: SAE International
  • ISSN: 1946-3952
  • EISSN: 1946-3960
  • Serial URL: https://www.sae.org/publications/collections/content/E-JOURNAL-04/

Subject/Index Terms

• TRT Terms: Combustion; Combustion deposits; Compression ignition engines; Diesel engines; Exhaust gases; Fuel injection; Heavy duty vehicles; Pollutants
• Uncontrolled Terms: Soot
• Subject Areas: Aviation; Energy; Highways; Vehicles and Equipment;

Filing Info

• Accession Number: 01623843
• Record Type: Publication
• Source Agency: SAE International
• Report/Paper Numbers: 2011-01-1812
• Files: TRIS, SAE
• Created Date: Jan 25 2017 3:29PM