A critical condition for combustion mode transition of flame spread in narrow channel

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K16365
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Social systems engineering/Safety system
• Research Institution: Toyohashi University of Technology
• Principal Investigator: Matsuoka Tsuneyoshi 豊橋技術科学大学, 工学(系)研究科(研究院), 助教 (90633040)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: 火災安全 / 燃え拡がり / 高酸素濃度 / 消炎限界 / 狭流路 / バックライト再構成法 / ホログラフィ干渉法

Outline of Final Research Achievements

Two series of experiments were conducted with two kinds of fuel geometry to form a narrow channel: parallel plates and cylinder. Based on a comparison between cylindrical and rectangular channels, the geometrical effects on the flame spread were clarified. The regression mode, which is known as a unique near-limit behavior that has observed for the flame spread in cylinder, is confirmed to occur for that in parallel plates. Experiments with a step change in oxidizer velocity enabling the mode transition were then performed to observe the response of the flame. It is found that the resulted mode is different depending on the channel geometry.
An in-situ method to extract the outer surface shape of deforming thermoplastic materials during combustion was proposed. A visualization system was developed and the proposed method was validated by using the system. A holographic interferometry for measurement of temperature field in the solid was also constructed.

Free Research Field

燃焼工学