Scaling Laws of Combustible Mixture Ignition

• KUWANA Kazunori

  山形大学工学部

• IMAMURA Tomohiko

  公立諏訪東京理科大学工学部

Bibliographic Information

Other Title

• 可燃性予混合気の熱面着火の相似則
• －Stagnation Flows Impinging on Heated Surfaces－
• －加熱壁面に衝突する淀み流の場合－

Abstract

　　　This paper considers the scaling laws of hot-surface ignition of combustible gases. Premixed stagnation flows impinging on hot surfaces were theoretically analyzed. Dimensional analysis was first conducted to identify a Damköhler number as the key parameter that controls ignition. Basic equations were then numerically solved to obtain the critical conditions for ignition. It was confirmed that ignition occurs when the heat flux from the hot surface to the gas phase exceeds a critical value. The obtained dependence of critical heat flux on the Damköhler number indicated the importance of thermal inertia in the gas phase. It was also found that the critical hot-surface temperature for ignition decreases with an increase in the Damköhler number. The dependence of critical temperature on the Damköhler number is nevertheless weak especially when the Damköhler number is large. This result suggests that the minimum ignition temperature (MIT) be used for safety-management purposes.

Journal

• Journal of the Japanese Society for Experimental Mechanics

  Journal of the Japanese Society for Experimental Mechanics 20 (4), 254-257, 2021-01-07

  The Japanese Society for Experimental Mechanics

Keywords

• Hot-surface ignition
• Premixed stagnation flow
• Dimensional analysis
• Critical heat flux
• Minimum ignition temperature (MIT)
• Damköhler number

Details

• CRID: 1390005506398225408
• NII Article ID: 130007967882
• DOI: 10.11395/jjsem.20.254
• ISSN: 18844219
• ISSN: 13464930
• Text Lang: ja
• Data Source:
  • JaLC
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed