Observation of Micro Premixed Flames Surrounded by High Temperature Burned Gas Flow

• FUCHIHATA Manabu

  School of Science and Engineering, Kinki University

• IDA Tamio

  School of Science and Engineering, Kinki University

• KUWANA Kazunori

  Yamagata University

Bibliographic Information

Other Title

• 高温既燃ガスに囲まれた微小予混合火炎の燃焼挙動

Abstract

  Flame structure of micro scale methane-air premixed flames is investigated experimentally. First, the uppermost and lowest flow rates which propagating flame could be formed are examined with simple single burner. Propagating flame is not stabilized on the simple single burner whose diameter is less than 4mm, despite the flow rate is well controlled between the expected velocity gradient limits for blow off and flash back. In addition, all the extinction mechanism observed for the burner diameter less than 4mm is blow off. It is, consequently, considered that the flame formed on the burner whose diameter is less than 4mm has other extinction mechanism in addition to blow off and flash back caused by flow velocity gradient. Secondly, the flame formed on the burner with pilot flame is observed. The flame is stabilized even on the burner whose diameter is 0.3mm. However, shape of the flame formed on the burner whose diameter is less than 1mm and at around lowest flow rate is near spherical. It is similar to the appearance of micro diffusion flames. On the other hand, the flame formed on the burner whose diameter is less than 0.5mm is not considered as propagating flame, because typical laminar propagating flame has a structure more than 0.5mm thickness at this condition. Therefore, it is supposed that the flame formed on the burner whose diameter is submillimeter and at around lowest flow rate is dominated by the diffusion mixing of oxygen and methane from the premixture and high temperature heat flux from the pilot gas flow.

Journal

• Journal of High Temperature Society

  Journal of High Temperature Society 36 (5), 240-245, 2010

  High Temperature Society of Japan

Keywords

• Laminar Premixed Flame
• Micro-flame
• Flame Structure

Details

• CRID: 1390282681404555776
• NII Article ID: 130004471271
• DOI: 10.7791/jhts.36.240
• COI: 1:CAS:528:DC%2BC3MXhs1Wqtg%3D%3D
• ISSN: 03871096
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed