Twodimensional imaging of formaldehyde in a transient fuel spray

Hidenori Kosaka, Volker H. Drewes, Luca Catalfamo, Norimasa Iida, Takeyuki Kamimoto

Research output: Contribution to journalArticlepeer-review


To investigate the ignition processes in a diesel spray, the two-dimensional techniques of silicone oil particle scattering imaging (SSI) and laser induced fluorescence (LIF) were used. The sequential and two-dimensional images of SSI reveal that the first ignition occurs in the periphery of spray head vortices, not in spray tip. The fluorescent images of intermediate products which are formed during the ignition reaction were taken by the LIF method with the laser sheet of the 3rd harmonic of Nd: YAG laser. We conducted these visualization techniques and measured the chamber pressure under the same conditions. The the ignition delays obtained by each technique were compared. This comparison showed that both the time when the first local heat release is detected by SSI method and the time when the first fluorescence is detected by LIF method are nearly equal to the time when the total heat release due to ignition reaction exceeds the heat absorption of fuel evaporated.

Original languageEnglish
Pages (from-to)1905-1911
Number of pages7
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Issue number647
Publication statusPublished - 2000 Jul


  • Diesel engine
  • Formaldehyde
  • Fuel injection
  • Fuel spray
  • Ignition
  • Laser induced fluorescence (LIF)
  • Low temperature oxidation

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering


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