INFLUENCE OF HYDROGEN ON THE EXTINCTION OF COUNTERFLOW DIFFUSION FLAMES BURNING DILUTED METHANE AND DILUTED AIR.

The influence of hydrogen addition on the extinction of laminar, diffusion flames stabilized between counterflowing streams of diluted methane and diluted air was experimentally determined. Measurements made were the velocity of the gaseous streams at the injection plane as a function of their composition at extinction. The measured velocity was then used to calculate the strain rate at extinction. It was noticed that if a small amount of hydrogen ( less than equivalent to 2. 0% by mass of methane) is added to the fuel stream there was negligible influence on the strain rate at extinction.