Ambient air entrainment into transient hydrogen jet and its flame jet

Eiji Tomita, Yoshisuke Hamamoto, Sadami Yoshiyama, Hiroyuki Tsutsumi, Toru Watanabe

Research output: Contribution to journalConference articlepeer-review

6 Citations (Scopus)


It is necessary to understand the entrainment process of ambient air into diesel sprays for the combustion process. This study focused on the entrainment process of non-combusting and combusting hydrogen jets instead of evaporated fuel sprays because of ease with measurement for fundamental research. Spatial and temporal changes of the air entrainment into the jets were obtained using flow visualization technique. The experimental results showed that the total air mass entrained into the flame jet is nearly equal to that into the cold jet. The rate of entrainment per unit area of the flame jet is smaller than that in the cold jet. When a transient jet is separated into side and front parts, the rate of air mass entrained from the front part of the jet decreases with time while the rate into the side of the jet per unit area is almost the same. The total air mass entrained into the jet can be approximately explained by the momentum theory.

Original languageEnglish
JournalSAE Technical Papers
Publication statusPublished - 1997
Externally publishedYes
EventInternational Congress and Exposition - Detroit, MI, United States
Duration: Feb 24 1997Feb 27 1997

ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering


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