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

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

研究成果: Article

23 引用 (Scopus)

抄録

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.

元の言語English
ページ(範囲)427-432
ページ数6
ジャーナルJournal of Loss Prevention in the Process Industries
20
発行部数4-6
DOI
出版物ステータスPublished - 2007 7
外部発表Yes

Fingerprint

hazard characterization
Velocity measurement
hydrogen
Hydrogen
Luminance
Hazards
air
Air
video cameras
Pressure transducers
transducers (equipment)
Balloons
Latex
Deceleration
Digital cameras
Video cameras
latex
Latexes
Ignition
duration

ASJC Scopus subject areas

  • Chemical Health and Safety
  • Process Chemistry and Technology
  • Safety, Risk, Reliability and Quality

これを引用

Hazard evaluation of hydrogen-air deflagration with flame propagation velocity measurement by image velocimetry using brightness subtraction. / Otsuka, Teruhito; Saito, Hiroyasu; Mizutani, Takaaki; Morimoto, Kaoru; Yoshikawa, Norihiko.

:: Journal of Loss Prevention in the Process Industries, 巻 20, 番号 4-6, 07.2007, p. 427-432.

研究成果: Article

@article{a8aefd2ce6ef471b9bf66148c8284d99,
title = "Hazard evaluation of hydrogen-air deflagration with flame propagation velocity measurement by image velocimetry using brightness subtraction",
abstract = "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.",
keywords = "Blast curve, Deflagration, Hydrogen, Image velocimetry, Scaling law",
author = "Teruhito Otsuka and Hiroyasu Saito and Takaaki Mizutani and Kaoru Morimoto and Norihiko Yoshikawa",
year = "2007",
month = "7",
doi = "10.1016/j.jlp.2007.04.031",
language = "English",
volume = "20",
pages = "427--432",
journal = "Journal of Loss Prevention in the Process Industries",
issn = "0950-4230",
publisher = "Elsevier BV",
number = "4-6",

}

TY - JOUR

T1 - Hazard evaluation of hydrogen-air deflagration with flame propagation velocity measurement by image velocimetry using brightness subtraction

AU - Otsuka, Teruhito

AU - Saito, Hiroyasu

AU - Mizutani, Takaaki

AU - Morimoto, Kaoru

AU - Yoshikawa, Norihiko

PY - 2007/7

Y1 - 2007/7

N2 - 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.

AB - 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.

KW - Blast curve

KW - Deflagration

KW - Hydrogen

KW - Image velocimetry

KW - Scaling law

UR - http://www.scopus.com/inward/record.url?scp=34548380015&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34548380015&partnerID=8YFLogxK

U2 - 10.1016/j.jlp.2007.04.031

DO - 10.1016/j.jlp.2007.04.031

M3 - Article

AN - SCOPUS:34548380015

VL - 20

SP - 427

EP - 432

JO - Journal of Loss Prevention in the Process Industries

JF - Journal of Loss Prevention in the Process Industries

SN - 0950-4230

IS - 4-6

ER -