A field experiment of hydrogen-air deflagration

Hiroyasu Saito, Takaaki Mizutani, Teruhito Ohtsuka, Naoto Uesaka, Yuki Morisaki, Hidenori Matsui, Norihiko Yoshikawa

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The behaviors of deflagrations initiated near the center of 1.5 m 3 hydrogen-air clouds were observed in a field experiment. The equivalence ratio of gas mixtures was varied in the range from 0.5 to 4.0. The corresponding changes of flame spread size, flame propagation velocity, and sound noise level were measured. In fuel lean cases, spherical flames were observed, while in fuel rich cases, the spherical flame propagation was followed by a rapid flame spread near the ground surface and a fireball at the top part of the cloud. The high-speed photographs and the records of ion probes show that the flame spread size and the flame acceleration increase with increasing the hydrogen concentration. The propagation velocity of spherical flames are one order of magnitude faster than the laminar burning velocity, and both quantities have a common dependency on the mixture equivalence ratio. The flame velocity reaches the maximum value of about 40 ms-1 near the equivalence ratio of 2.0. The flame velocity in the fireballs reaches 180 ms-1 at the maximum. The sound noise level increases with increasing equivalence ratio.

Original languageEnglish
Pages (from-to)140-146
Number of pages7
JournalScience and Technology of Energetic Materials
Volume65
Issue number4
Publication statusPublished - 2004
Externally publishedYes

Fingerprint

deflagration
Hydrogen
flames
air
hydrogen
Air
equivalence
noise (sound)
Acoustic noise
Experiments
fireballs
Acoustic waves
propagation velocity
flame propagation
Gas mixtures
ion probes
Ions
photographs
gas mixtures
high speed

ASJC Scopus subject areas

  • Engineering (miscellaneous)

Cite this

Saito, H., Mizutani, T., Ohtsuka, T., Uesaka, N., Morisaki, Y., Matsui, H., & Yoshikawa, N. (2004). A field experiment of hydrogen-air deflagration. Science and Technology of Energetic Materials, 65(4), 140-146.

A field experiment of hydrogen-air deflagration. / Saito, Hiroyasu; Mizutani, Takaaki; Ohtsuka, Teruhito; Uesaka, Naoto; Morisaki, Yuki; Matsui, Hidenori; Yoshikawa, Norihiko.

In: Science and Technology of Energetic Materials, Vol. 65, No. 4, 2004, p. 140-146.

Research output: Contribution to journalArticle

Saito, H, Mizutani, T, Ohtsuka, T, Uesaka, N, Morisaki, Y, Matsui, H & Yoshikawa, N 2004, 'A field experiment of hydrogen-air deflagration', Science and Technology of Energetic Materials, vol. 65, no. 4, pp. 140-146.
Saito H, Mizutani T, Ohtsuka T, Uesaka N, Morisaki Y, Matsui H et al. A field experiment of hydrogen-air deflagration. Science and Technology of Energetic Materials. 2004;65(4):140-146.
Saito, Hiroyasu ; Mizutani, Takaaki ; Ohtsuka, Teruhito ; Uesaka, Naoto ; Morisaki, Yuki ; Matsui, Hidenori ; Yoshikawa, Norihiko. / A field experiment of hydrogen-air deflagration. In: Science and Technology of Energetic Materials. 2004 ; Vol. 65, No. 4. pp. 140-146.
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