同轴扩散火焰加压燃烧不稳定研究

来源 :高温气体动力学国家重点实验室2017年度夏季学术研讨会 | 被引量 : 0次 | 上传用户:tdsl
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本文对0.2MPa至3.0MPa压力下的甲烷/纯氧同轴层流扩散火焰震荡特性进行试验研究.利用光电倍增管、高速相机等仪器捕捉不同压力及雷诺数下火焰形态变化.研究发现在不同雷诺数下,火焰存在稳定、间歇震荡及持续震荡三种模式,持续震荡临界雷诺数在39-53区间;火焰震荡频率随雷诺数增加呈下降趋势,但随压力升高而增加;建立了弗劳德数与震荡频率函数关系(F=1.63X Fr-015),实现火焰震荡频率准确预测(相对误差≤1.06%).
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