Flame acceleration and detonation initiation around a T-shaped bifurcation

Journal of Loss Prevention in the Process Industries Volume 89 Page 105280- published_at 2024-03-07
アクセス数 : 18
ダウンロード数 : 0

今月のアクセス数 : 18
今月のダウンロード数 : 0
File
available 2026-03-07 4.05 MB 種類 : fulltext エンバーゴ : 2026-03-07
Title ( eng )
Flame acceleration and detonation initiation around a T-shaped bifurcation
Creator
Honda Tomoaki
Ogawa Syotaro
Kida Yusuke
Johzaki Tomoyuki
Yatsufusa Tomoaki
Source Title
Journal of Loss Prevention in the Process Industries
Volume 89
Start Page 105280
Abstract
We experimentally studied the flame behavior of H2–O2–N2 premixed gas around a T-shaped bifurcation in a piping system with an inner diameter of 20 mm. In the experiments, we measured the flame speed as a function of the path length from the igniting spark plug using ion probes and observed self-emission images using a high-speed camera. The speed and disturbance of the flame entering the bifurcation were varied by installing various numbers of obstacle rods into the pipe just downstream of the igniting spark plug. We compared the effects of the bifurcation on the flame propagation between two cases: the flame propagating straight through the T-shaped bifurcation and the flame turning 90° at the T-shaped bifurcation. In both cases, the flame was accelerated around the T-shaped bifurcation. Especially, in the case of the flame turning 90° at the T-shaped bifurcation, the flame acceleration was remarkable and, in some cases, a detonation was initiated immediately downstream of the T-shaped bifurcation. The observed remarkable flame acceleration is considered to be ascribed to the recirculation region formed by the separation of the unburned-gas flow downstream of the T-shaped bifurcation, and governed by the ratio between the ignition delay time of the mixture of the burned and unburned gases and the sound-crossing time for the pipe diameter which is the only length scale of a long pipe.
Keywords
Flame acceleration
Detonation
Deflagration-to-detonation transition
T-shaped bifurcation
Language
eng
Resource Type journal article
Publisher
Elsevier
Date of Issued 2024-03-07
Rights
© 2024. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
This is not the published version. Please cite only the published version.
この論文は出版社版ではありません。引用の際には出版社版をご確認、ご利用ください。
Publish Type Accepted Manuscript
Access Rights embargoed access
Source Identifier
[DOI] https://doi.org/10.1016/j.jlp.2024.105280 isVersionOf
助成機関名
日本学術振興会
Japan Society for the Promotion of Science
助成機関識別子
[Crossref Funder] https://doi.org/10.13039/501100001691
研究課題名
助走距離の短縮と伝播の高速化によるパルスデトネーション技術の高度化
Improvement of the pulse-detonation technology by shortening of the run-up distance and speeding up of the propagation
研究課題番号
20H02352
Remark The full-text file will be made open to the public on 07 March 2026 in accordance with publisher's 'Terms and Conditions for Self-Archiving'