Imaging of soot formation process in a diesel spray flame by laser-induced emission techniques

Hidenori Kosaka, Tetsuya Aizawa

Research output: Contribution to journalReview article


In order to study the soot formation process in a diesel spray flame, simultaneous imaging of soot precursor and soot particles in a transient spray flame, achieved in a rapid compression machine, was conducted by laser-induced fluorescence (LIF) and incandescence (LII) techniques. The LIF and LII were separately imaged by two image-intensified CCD cameras with identical detection wavelength (400 nm) and bandwidth (80 nm). The intensity of the LIF due to soot precursor reached its maximum immediately after rich premixed combustion. In contrast, the intensity of the LII due to soot particles increased gradually and reached its maximum after the end of injection. Measured LIF spectrum of the soot precursor in the spray flame was very broad and showed no apparent spectral structure.

Original languageEnglish
Pages (from-to)710-715
Number of pages6
JournalNihon Enerugi Gakkaishi/Journal of the Japan Institute of Energy
Issue number9
Publication statusPublished - 1 Sep 2004



  • Combustion
  • Diesel engine
  • Ignition
  • Laser-Induced Fluorescence
  • Laser-Induced Incandescence
  • Soot formation
  • Soot precursor

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