This research experimentally investigates exhaust gas characteristics of a methane-air lifted-jet flame with elevated stream temperature up to 450 K. Emission indices of NOx and CO were measured by direct gas sampling using a gas detector tube. The index of NOx decreased or did not change in quantity with increasing stream temperature up to 350 K, and then increased with further temperature increases. The index of CO changed in an opposite manner to that of NOx with increasing stream temperature. These tendencies demonstrated that the generation of emission gases did not monotonically increase with stream temperature. These non-monotonous behaviors of the emission indices were caused by particular variations of lifted flame height and flame length. In order to examine these flame characteristics, we measured the flame curvature with OH-PLIF and related it to the triple flame height. These flame behaviors could explain the unique emission characteristics of the lifted-jet flame with stream heating.
|ジャーナル||Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B|
|出版ステータス||Published - 2010 10|
ASJC Scopus subject areas
- Condensed Matter Physics
- Mechanical Engineering