Study of Pre-chamber Jet Combustion Behavior using a Small Two-stroke Optically Accessible Engine

A small 2-stroke engine can be an effective power source for an electric generator mounted on a series hybrid electric vehicle. In recent years, a technology referred to as pre-chamber jet combustion has attracted attention as a means of enhancing thermal efficiency by improving mixture ignitability. In this study, experiments were conducted to investigate differences in combustion behavior between the application of spark-ignited (SI) combustion and pre-chamber jet combustion to a small, two-stroke engine. The experimental equipment used was a two-stroke, single-cylinder, optically accessible engine with a displacement of 63.3 cm3. Differences between conventional SI combustion and pre-chamber jet combustion were examined by means of in-cylinder pressure analysis, in-cylinder combustion visualization and image processing software. The diameter of the connecting orifice of the pre-chamber was varied between two types. The results revealed that the combustion time and indicated mean effective pressure obtained with pre-chamber jet combustion were more stable compared with conventional combustion. It was also found that a linear jet combustion flow was formed with a smaller connecting orifice diameter and the combustion time was shortened, but combustion was not stable. In addition, it was found that the maximum pressure decreased with a higher jet flow velocity.

• Record URL:
  https://doi.org/10.4271/2022-32-0076
• Supplemental Notes:
  • Abstract reprinted with permission of SAE International.
• Authors:
  • DEUSHI, Takato
  • NAKA, Takuma
  • TSUJIGUCHI, Tatsuya
  • Iijima, Akira
  • YAMAGUCHI, Shiro
  • KUROIWA, Minoru
  • Eto, Kuniyoshi
• Conference:
  • The 26th Small Powertrains and Energy Systems Technology Conference
  • Location: Himeji , Japan
  • Date: 2022-10-31 to 2022-11-3
• Publication Date: 2022-1-9

Language

• English

Media Info

• Media Type: Web
• Features: References;

Subject/Index Terms

• TRT Terms: Combustion; Engines; Hybrid vehicles; Spark ignition engines; Two stroke cycle engines; Visualization
• Subject Areas: Highways; Vehicles and Equipment;

Filing Info

• Accession Number: 01870503
• Record Type: Publication
• Source Agency: SAE International
• Report/Paper Numbers: 2022-32-0076
• Files: TRIS, SAE
• Created Date: Jan 23 2023 4:23PM