Hazard evaluation of hydrogen-air deflagration with flame propagation velocity measurement by image velocimetry using brightness subtraction

Teruhito Otsuka, Hiroyasu Saitoh, Takaaki Mizutani, Kaoru Morimoto, Norihiko Yoshikawa

Research output: Contribution to journalArticle

23 Citations (Scopus)


Deflagration phenomena in hydrogen-air mixtures initially filled in 1.4 m3 spherical latex balloons were measured using a high-speed digital video camera and pressure transducers. The image velocimetry using brightness subtraction was introduced to eliminate the background effects for obtaining accurate time evolution records of flame propagation velocity. The maximum flame propagation velocity of about 100 m/s was observed with maximum overpressure 15 kPa at 1 m from ignition point. According to the detailed flame propagation velocity records, there were long deceleration durations. The observed maximum overpressure was smaller than the overpressure estimated by the basis of the observed maximum flame propagation velocity and the pressure wave theories of spherical flames. A new blast curve plot of scaled overpressure vs. distance was tentatively proposed.

Original languageEnglish
Pages (from-to)427-432
Number of pages6
JournalJournal of Loss Prevention in the Process Industries
Issue number4-6
Publication statusPublished - 2007 Jul 1



  • Blast curve
  • Deflagration
  • Hydrogen
  • Image velocimetry
  • Scaling law

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Food Science
  • Chemical Engineering(all)
  • Safety, Risk, Reliability and Quality
  • Energy Engineering and Power Technology
  • Management Science and Operations Research
  • Industrial and Manufacturing Engineering

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