Measurement of unburned hydrocarbons in a lean burn natural gas engine with prechamber by using PLIF technique

Nobuhiko Fukatani, Takashi Wakabayashi, Takao Fujiwaka, Eiji Tomita

Research output: Contribution to journalArticlepeer-review


A producing process of unburned hydrocarbons in the cylinder of a natural gas engine with prechamber was investigated. Distribution of unburned hydrocarbons (UHC) was measured by the planer laser induced fluorescence (PLIF) and acetone was selected as a tracer in fuel, after investigating of characteristic of acetone. The effects of acetone concentration in fuel and ambient pressure on laminar burning velocity were investigated. Furthermore, the effects of laser energy, ambient pressure and equivalence ratio on fluorescence were conducted. A single cylinder gas engine with 170 mm bore was used and the UHC was visualized by attaching a cylinder made of quartz on the top of the liner. The result obtained from the PLIF measurement showed that the UHC from the prechamber was little despite of rich mixture in the prechamber. In the main chamber, the UHC from the crevice of top land between the piston and the cylinder liner during expansion stroke was confirmed. And a little amount of UHC was observed in the burned gas at the end of combustion. This was also confirmed by the images with a high-speed video camera.

Original languageEnglish
Pages (from-to)1263-1270
Number of pages8
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Issue number5
Publication statusPublished - 2006


  • Emissions
  • Internal Combustion Engine
  • LIF
  • Laser Diagnostics
  • Lean Burn
  • Natural Gas Engine
  • Unburned Hydrocarbons

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering


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