Abstract
The flame reignition phenomenon that occurs after blowout of main flame is studied by using hydrogen fuel ejected vertically upward from a straight circular nozzle. Schlieren technique is employed to visualize the hydrogen flame, with focus on the region near the nozzle exit. It is found that : (1) The flame reignition phenomenon of hydrogen jet diffusion flames occurs only in certain nozzle diameters and flow rates ; (2) The small-sized flamelet (2∼3 mm) remains on the nozzle rim at the mass flow rates in which the reignition occurs. A further increase in mass flow rates causes the flamelet to extinguish and no reignition appear any more ; (3) The interval of name reignition increases with an increase in mass flow rates ; (4) Rim thickness does not affect the flow rates of reignition start and reignition finish. However, it influences the existence of flamelet formed above the nozzle rim.
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