This paper presents flow field measurements of hydrogen/methane mixtures under near blowout conditions. Previous high speed visualizations by our group of these flames shows that the blow off phenomenology varies with percentage of hydrogen [1]. This paper further characterizes the flow field of these flames using particle image velocimetry (PIV). A variety of highly dynamic flame and flow features are observed, which vary substantially with the H2 levels in the fuel. This variation is apparently due to the enhanced strain resistance of hydrogen augmented flames and flow dilatation ratio effects upon flow dynamics, particularly vortex breakdown. 德國(guó)LaVision PIV/PLIF粒子成像測(cè)速場(chǎng)儀 Imager pro X PIV相機(jī) 用于粒子成像測(cè)速(PIV)的熒光示蹤粒子