気流の加熱初期における層流浮き上がり火炎の燃焼ガス特性(熱工学,内燃機関,動力など)

概要

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This research experimentally investigates exhaust gas characteristics of a methane-air lifted-jet flame with elevated stream temperature up to 450K. 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 350K, 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.
2010-10-25