Abstract
To investigate propagation characteristics of methane-air premixed flames at high pressure, constant volume vessel which can control turbulence characteristics, initial pressure and equivalence ratio has been developed, and high repletion rate OH planar laser induced fluorescence (PLIF) and CH chemiluminescence measurements are performed in the combustion field. The flame front and radius of flame are evaluated from OH PLIF and CH chemiluminescence independently. When radius of flame is large, flame speed becomes constant in laminar flame but increases in turbulent flame. Flame speed which is evaluated from OH PLIF images fluctuates significantly because of local turbulence characteristics and flame structure.
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