急速混合型管状火炎バーナにおける火炎構造制御に関する実験的研究 An Experimental Study on the Flame Structure Control in a Rapidly Mixed Type Tubular Flame Burner

Access this Article

Author(s)

Abstract

Effects of the swirl number <i>S</i> and the injection velocity ratio <i>α</i> on the structure of a rapidly mixed tubular flame have been experimentally investigated. Extinction limits, distributions of the flame chemi-luminescence, and distributions of local equivalence ratios of the unburned gas have been determined. Results show that, with the burners of different swirl numbers (<i>S</i> = 2.5, 5.0), the total equivalence ratio at the lean and the rich extinction limits are almost the same, however, both the limits shift on the relatively fuel rich side when <i>α<sub>st</sub></i> = 4.8, whereas the limits shift in the fuel lean side when <i>α<sub>st</sub></i> = 0.5 as compared with <i>α<sub>st</sub></i> = 1.0. According to the result of the flame chemi-luminescence measurement, combustion is intensified in relatively fuel rich side when <i>α<sub>st</sub></i> = 4.8, whereas combustion is intensified in the fuel lean side when <i>α<sub>st</sub></i> = 0.5. Results of the gas analysis have revealed that, these changes in the extinction limits and combustion intensities are attributed to the change in the local equivalence ratio <i>Φ<sub>local.</sub></i> At the center of the burner, a relatively fuel lean mixture is formed when <i>α<sub>st</sub></i> = 4.8, whereas a relatively fuel rich mixture is formed when <i>α<sub>st</sub></i> = 0.5 as compared with <i>α<sub>st</sub></i> = 1.0. These results indicate that, with use of the injection velocity ratio, a flexible, as well as an accurate structure control of rapidly mixed tubular flames is possible.

Journal

  • TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B

    TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B 78(785), 185-193, 2012

    The Japan Society of Mechanical Engineers

Codes

  • NII Article ID (NAID)
    130002050640
  • Text Lang
    UNK
  • ISSN
    0387-5016
  • Data Source
    J-STAGE 
Page Top