Combustion Diagnostics Using a Spark Plug as Ion Probe

Yoshisuke Hamamoto, Sadami Yoshiyama, Eiji Tomita, Norihiko Hirata, Atsushi Ueda

Research output: Contribution to journalArticlepeer-review


In order to investigate the relation between ion current and combustion characteristics, ion current signal from a spark plug used as an ion probe, pressure history and flame development were measured in a homogeneous propane-air mixture in closed combustion chambers. When negative bias is applied to the central electrode of the spark plug, the ion current flows only due to an early flame kernel existing near the spark plug. When positive bias is applied to the central electrode, the ion current flows from the central electrode to the combustion chamber wall and to the ground electrode. Consequently, the ion current is dominated by the contact area between the flame and combustion chamber wall. The appearance time of ion-current peaks is related with combustion duration.

Original languageEnglish
Pages (from-to)1486-1492
Number of pages7
JournalTransactions of the Japan Society of Mechanical Engineers Series B
Issue number572
Publication statusPublished - 1994
Externally publishedYes


  • Combustion
  • Combustion Measurement
  • Internal Combustion Engine
  • Ion Current
  • Premixed Combustion
  • Spark-Ignition Engine

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering


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