Stability and Behaviors of Methane/Propane and Hydrogen Micro Flames

• Published in: Journal of High Temperature Society Vol. 36; no. 5; pp. 233 - 239
• Main Authors: YOSHIMOTO, Takamitsu, KINOSHITA, Koichiro, KITAMURA, Hideki, TANIGAWA, Ryoichi
• Format: Journal Article
• Language: Japanese
• Published: High Temperature Society of Japan 01.01.2010
• Subjects: Diffusion flames; Flame Behaviors; Flame stability; Fuel flow; High speed; Hydrogen; Methane; Micro Flame; Nozzles; Propane; Stability; Stability Limits
• ISSN: 0387-1096
• DOI: 10.7791/jhts.36.233

The flame stability limits essentially define the fundamental operation of the combustion system. Recently the micro diffusion flame has been remarked. The critical conditions of the flame stability limit are highly dependent on nozzle diameter, species of fuel and so on. The micro diffusion flame of Methane/Propane and Hydrogen is formed by using the micro-scale nozzle of which inner diameter is less than 1mm. The configurations and behaviors of the flame are observed directly and visualized by the high speed video camera The criteria of stability limits are proposed for the micro diffusion flame. The objectives of the present study are to get further understanding of lifting/blow-off for the micro diffusion flame. The results obtained are as follows. (1) The behaviors of the flames are classified into some regions for each diffusion flame. (2) The micro diffusion flame of Methane/Propane cannot be sustained, when the nozzle diameter is less than 0.14 mm. (3) The diffusion flame cannot be sustained below the critical fuel flow rate. (4) The minimum flow which is formed does not depends on the average jet velocity, but on the fuel flow rate. (5) the micro flame is laminar. The flame length is decided by fuel flow rate.