Fire and explosion - observation of confined deflagration phenomena of flammable gas mixtures under elevated gravity

Hiroyasu Saito, Takaaki Mizutani, Sayuri Kurihara, Tomohito Hori

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

In order to investigate the effects of gravity on ignition and deflagration of flammable mixtures, we conducted flammable gas explosion experiments using constant volume combustion vessels under several gravity levels from normal gravity (1 G) to elevated gravity up to 50 G. The elevated gravity field was formed by a large-size centrifuge system. We examined flame kernel growth, flame spreading, and explosion pressure in hydrogen-air, methane-air, and propane-air mixtures in an elevated gravity environment. The flammability ranges were determined by the records of the explosion pressures, and it was confirmed that the upper and lower explosion limits were approximately the same regardless of the gravity level. However, the shapes of the propagating flames changed dramatically with increase of gravity level due to strong buoyancy effect especially in lean and rich mixture conditions with slow burning velocity. Moreover, it was found that similar flame spreading phenomena were observed in large-size deflagration of rich mixture under normal gravity and small-size deflagration of stoichiometric mixture under elevated gravity.

Original languageEnglish
Title of host publicationProgress in Scale Modeling, Volume II: Selections from the International Symposia on Scale Modeling, ISSM VI (2009) and ISSM VII (2013)
PublisherSpringer International Publishing
Pages105-114
Number of pages10
ISBN (Electronic)9783319103082
ISBN (Print)9783319103075
DOIs
Publication statusPublished - 2015 Jan 1

Fingerprint

flammable gases
deflagration
Gas mixtures
Explosions
gas mixtures
explosions
Gravitation
Fires
gravitation
flames
air
gas explosions
Air
centrifuges
flammability
Flammability
Centrifuges
Buoyancy
buoyancy
Propane

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Saito, H., Mizutani, T., Kurihara, S., & Hori, T. (2015). Fire and explosion - observation of confined deflagration phenomena of flammable gas mixtures under elevated gravity. In Progress in Scale Modeling, Volume II: Selections from the International Symposia on Scale Modeling, ISSM VI (2009) and ISSM VII (2013) (pp. 105-114). Springer International Publishing. https://doi.org/10.1007/978-3-319-10308-2_8

Fire and explosion - observation of confined deflagration phenomena of flammable gas mixtures under elevated gravity. / Saito, Hiroyasu; Mizutani, Takaaki; Kurihara, Sayuri; Hori, Tomohito.

Progress in Scale Modeling, Volume II: Selections from the International Symposia on Scale Modeling, ISSM VI (2009) and ISSM VII (2013). Springer International Publishing, 2015. p. 105-114.

Research output: Chapter in Book/Report/Conference proceedingChapter

Saito, H, Mizutani, T, Kurihara, S & Hori, T 2015, Fire and explosion - observation of confined deflagration phenomena of flammable gas mixtures under elevated gravity. in Progress in Scale Modeling, Volume II: Selections from the International Symposia on Scale Modeling, ISSM VI (2009) and ISSM VII (2013). Springer International Publishing, pp. 105-114. https://doi.org/10.1007/978-3-319-10308-2_8
Saito H, Mizutani T, Kurihara S, Hori T. Fire and explosion - observation of confined deflagration phenomena of flammable gas mixtures under elevated gravity. In Progress in Scale Modeling, Volume II: Selections from the International Symposia on Scale Modeling, ISSM VI (2009) and ISSM VII (2013). Springer International Publishing. 2015. p. 105-114 https://doi.org/10.1007/978-3-319-10308-2_8
Saito, Hiroyasu ; Mizutani, Takaaki ; Kurihara, Sayuri ; Hori, Tomohito. / Fire and explosion - observation of confined deflagration phenomena of flammable gas mixtures under elevated gravity. Progress in Scale Modeling, Volume II: Selections from the International Symposia on Scale Modeling, ISSM VI (2009) and ISSM VII (2013). Springer International Publishing, 2015. pp. 105-114
@inbook{7018960177a4494395debfd13d1d266f,
title = "Fire and explosion - observation of confined deflagration phenomena of flammable gas mixtures under elevated gravity",
abstract = "In order to investigate the effects of gravity on ignition and deflagration of flammable mixtures, we conducted flammable gas explosion experiments using constant volume combustion vessels under several gravity levels from normal gravity (1 G) to elevated gravity up to 50 G. The elevated gravity field was formed by a large-size centrifuge system. We examined flame kernel growth, flame spreading, and explosion pressure in hydrogen-air, methane-air, and propane-air mixtures in an elevated gravity environment. The flammability ranges were determined by the records of the explosion pressures, and it was confirmed that the upper and lower explosion limits were approximately the same regardless of the gravity level. However, the shapes of the propagating flames changed dramatically with increase of gravity level due to strong buoyancy effect especially in lean and rich mixture conditions with slow burning velocity. Moreover, it was found that similar flame spreading phenomena were observed in large-size deflagration of rich mixture under normal gravity and small-size deflagration of stoichiometric mixture under elevated gravity.",
author = "Hiroyasu Saito and Takaaki Mizutani and Sayuri Kurihara and Tomohito Hori",
year = "2015",
month = "1",
day = "1",
doi = "10.1007/978-3-319-10308-2_8",
language = "English",
isbn = "9783319103075",
pages = "105--114",
booktitle = "Progress in Scale Modeling, Volume II: Selections from the International Symposia on Scale Modeling, ISSM VI (2009) and ISSM VII (2013)",
publisher = "Springer International Publishing",

}

TY - CHAP

T1 - Fire and explosion - observation of confined deflagration phenomena of flammable gas mixtures under elevated gravity

AU - Saito, Hiroyasu

AU - Mizutani, Takaaki

AU - Kurihara, Sayuri

AU - Hori, Tomohito

PY - 2015/1/1

Y1 - 2015/1/1

N2 - In order to investigate the effects of gravity on ignition and deflagration of flammable mixtures, we conducted flammable gas explosion experiments using constant volume combustion vessels under several gravity levels from normal gravity (1 G) to elevated gravity up to 50 G. The elevated gravity field was formed by a large-size centrifuge system. We examined flame kernel growth, flame spreading, and explosion pressure in hydrogen-air, methane-air, and propane-air mixtures in an elevated gravity environment. The flammability ranges were determined by the records of the explosion pressures, and it was confirmed that the upper and lower explosion limits were approximately the same regardless of the gravity level. However, the shapes of the propagating flames changed dramatically with increase of gravity level due to strong buoyancy effect especially in lean and rich mixture conditions with slow burning velocity. Moreover, it was found that similar flame spreading phenomena were observed in large-size deflagration of rich mixture under normal gravity and small-size deflagration of stoichiometric mixture under elevated gravity.

AB - In order to investigate the effects of gravity on ignition and deflagration of flammable mixtures, we conducted flammable gas explosion experiments using constant volume combustion vessels under several gravity levels from normal gravity (1 G) to elevated gravity up to 50 G. The elevated gravity field was formed by a large-size centrifuge system. We examined flame kernel growth, flame spreading, and explosion pressure in hydrogen-air, methane-air, and propane-air mixtures in an elevated gravity environment. The flammability ranges were determined by the records of the explosion pressures, and it was confirmed that the upper and lower explosion limits were approximately the same regardless of the gravity level. However, the shapes of the propagating flames changed dramatically with increase of gravity level due to strong buoyancy effect especially in lean and rich mixture conditions with slow burning velocity. Moreover, it was found that similar flame spreading phenomena were observed in large-size deflagration of rich mixture under normal gravity and small-size deflagration of stoichiometric mixture under elevated gravity.

UR - http://www.scopus.com/inward/record.url?scp=84944619776&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84944619776&partnerID=8YFLogxK

U2 - 10.1007/978-3-319-10308-2_8

DO - 10.1007/978-3-319-10308-2_8

M3 - Chapter

AN - SCOPUS:84944619776

SN - 9783319103075

SP - 105

EP - 114

BT - Progress in Scale Modeling, Volume II: Selections from the International Symposia on Scale Modeling, ISSM VI (2009) and ISSM VII (2013)

PB - Springer International Publishing

ER -