J0801-4-4 火炎片の局所消炎回復機構に及ぼす乱れと火炎伝播特性(次世代燃料と新しい燃焼技術,エンジン,動カシステム(4))

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Local quenching and recovering mechanisms of lean premixed CH_4 air flame (LPF) and lean CH_4 diluted with N_2 diffusion flame (LDF) in a impinging flow have been investigated experimentally by using high speed time series of a particles image velocimetry (PFV). Near the extinction limit, the local quenching phenomena observed frequently However, the local quenching is not always trigger to develop the global extinction. Most of cases, the flame can recover from the local quenching phenomena There are three distinct local quenching recovery mechanisms which are passive recovery mode, active recovery mode and eddy transportation recovery mode. The modes depend on the quenching location and scales, the flamelet propagation speed against the head gas, and the eddy transportations. The recovery mechanisms work well in the turbulence added in the premixed gas and also the mixture has to be in the self-propagating condition.
2009-09-12