An air cooling/atomizing fuel injector bar is developed for afterburner.It not only can lower the wall temperature of the fuel injector bar,but also has the ability of air atomizing.Its comprehensive performance in cooling,atomizing and combustion was studied experimentally.The temperature indicating paint and thermal infrared imager were used to measure the wall temperature of the fuel injector bar.The cooling experiment shows that a very good cooling effect can be reached with this new design.When less than 2% of the compressor outlet air is used for cooling,the bar's surface temperature can be decreased by 100 K to 200 K in 1300 K high temperature gas flow.Results of the atomizing experiment obtained from the PDA measuring system show that a much better fuel spray quality can be achieved with the new design.The SMD is obviously decreased and the spray uniformity is considerably improved.Due to its matching with the V type flame holder,the combustion experiment demonstrates that flame lean extinguishing limit can be widened two or three times and the combustion efficiency is much higher too.Therefore its comprehensive performance is enhanced,and the new design is effective and feasible.
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