光流法测速在点火过程研究中的应用

As a tool of motion image analysis，optical flow velocimetry has attracted increasing attention in the field of combustion diagnosis. It can quantitatively measure the evolution velocity of flame kernel in the forced ignition process，which helps to reveal the underlying physical and chemical mechanisms of ignition process. The study verified the feasibility and accuracy of applying optical flow velocimetry to the study of ignition process，and the forced ignition processes in the static and flowing methane/air mixtures were investigated. The propagation velocity of flame kernel surface，which is important in establishing the ignition model，was quantitatively calculated. The results show that the magnitude of flame propagation velocity increases gradually in the ignition process，and that there are multiple divergent sources in the velocity vector field of flame kernels.