Effects of turbulence on flame structure and NOx emission of turbulent jet non-premixed flames in high-temperature air combustion

Hideaki Kobayashi, Ken Oono, Eun Seong Cho, Hirokazu Hagiwara, Yasuhiro Ogami, Takashi Niioka

研究成果: Article査読

10 被引用数 (Scopus)

抄録

Turbulent jet non-premixed flame under the conditions of High Temperature Air Combustion (HiCOT) was investigated. Air diluted with nitrogen was preheated up to about 1 300 K. Propane was injected through a fuel tube parallel to the preheated airflow. LDV measurement of turbulence, CH-PLIF for reaction zone visualization, and NOx concentration measurements in the burnt gas were performed and the relations between these characteristics were examined. Results showed that turbulence intensity generated by perforated plate installed upstream of the fuel tube was high at high-temperature airflow due to high velocity compared with that at room temperature airflow when the flow rate was controlled to keep the excess air ratio constant regardless of preheating. The reaction zone represented by the CH-PLIF images still had a thin structure even in the HiCOT condition of oxygen concentration of 8 vol.%. The flow turbulence in the combustion duct played a significant role in decreasing NOx emission. Due to turbulence, flame was broken and a bubble-like flame structure was generated, especially in the lifted flame cases, implying that the burning fuel lumps flow a considerable distance in air with a low oxygen concentration and generate uniform heat release profiles in HiCOT furnaces.

本文言語English
ページ(範囲)286-292
ページ数7
ジャーナルJSME International Journal, Series B: Fluids and Thermal Engineering
48
2
DOI
出版ステータスPublished - 2005 5月

ASJC Scopus subject areas

  • 機械工学
  • 物理化学および理論化学
  • 流体および伝熱

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