Modeling and Experiments on Ignition of Fuel Sprays Considering the Interaction Between Fuel-Air Mixing and Chemical Reactions

This study aimed to elucidate the ignition processes in transient fuel-sprays over a wide range of ambient conditions corresponding to PCCI combustion, as well as diesel combustion. Ignition of n-heptane sprays was experimentally investigated by using a constant-volume vessel. The well-known temperature dependencies of ignition delays were observed at a high ambient pressure. On the other hand, a negative temperature coefficient (NTC) accompanying a two-stage pressure rise was detected for lower ambient pressures. High-speed shadowgraph images indicated that the temperature rise begins in the highly homogenous mixture along the combustion chamber wall. Enhancement of fuel-air mixing with elevated injection pressure and a reduced nozzle orifice delays the appearance of hot flame in the NTC condition. To better understand these phenomena, ignition processes were predicted using an ignition model including a stochastic turbulent mixing model and a reduced chemical reaction scheme. Calculated ignition delays and pressure curves were compared with experimental data. Based on the comparison, explanations are made on the measured effects of injection conditions with an emphasis on the relation between fuel-air mixing and chemical reactions.

• Record URL:
  • https://doi.org/10.4271/2003-01-1071
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/01487191
• Supplemental Notes:
  • Abstract reprinted with permission of SAE International.
• Authors:
  • Ishiyama, Takuji
  • Shioji, Masahiro
  • Ihara, Tadayoshi
  • Katsuura, Akihiro
• Conference:
  • SAE 2003 World Congress & Exhibition
  • Location: Detroit Michigan, United States
  • Date: 2003-3-3 to 2003-3-6
• Publication Date: 2001-10-28

Language

• English

Media Info

• Media Type: Web
• Serial:
  • SAE Technical Paper
  • Publisher: Society of Automotive Engineers (SAE)
  • ISSN: 0148-7191
  • EISSN: 2688-3627
  • Serial URL: http://papers.sae.org/

Subject/Index Terms

• TRT Terms: Combustion; Combustion chambers; Compression ignition engines; Fuel injection; Pressure
• Subject Areas: Highways; Vehicles and Equipment;

Filing Info

• Accession Number: 01802266
• Record Type: Publication
• Source Agency: SAE International
• Report/Paper Numbers: 2003-01-1071
• Files: TRIS, SAE
• Created Date: Dec 9 2021 10:24AM