利用Hencken型平面携带流反应器系统,研究了不同流动状态下一次风含氧量对煤粉颗粒群着火特性的影响.实验表明,在湍流状态下的一次风火焰形态与层流状态下存在很大差别.随O2浓度增大,煤粉颗粒群着火延迟减小,在层流状态下表现得更明显.在湍流一次风中煤粉颗粒群倾向于非均相着火,呈现出连续的暗红色火焰;而在层流一次风中,煤粉颗粒群倾向于均相着火,并会因局部氧量的不足在某一高度突然出现明亮的黄色碳烟火焰.
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