中文摘要：

本文在定容燃烧弹中,研究了高温高压（0.75 MPa,450 K）下甲烷-乙烷-空气预混合气火焰传播规律,并系统分析了当量比、混合气中乙烷含量对混合气层流燃烧及火焰稳定性的影响。实验结果表明：随着混合气中乙烷含量的增加,不同当量比下无拉伸火焰燃烧速率均增大,马克斯坦长度增大,表明火焰稳定性增强。在实验范围内,无拉伸火焰传播速率,无拉伸火焰燃烧速率均随着当量的增加先增大后减小,且最大值出现在化学当量比附近。

英文摘要：

In this paper,combustion characteristics of premixed methane-ethane-air mixtures with various ethane concentration at different equivalence ratio under elevated pressure and temperature （p=0.75 MPa,T=450 K） will be reported.The effect of ethane concentration on burning speed and flame stability will be discussed.Experimental results show that with the increase of ethane concentration the unstretched burning velocity is increased.The Markstein length is increased as well, which shows that the flame stability is enhanced.Within the range of this study,unstretched flame speed and unstretched burning velocity are increased until reaching the peak value and then reduced with the increase of equivalence ratio.The maximum value is obtained near the stoichiometric ratio.