中文摘要：

在定容燃烧弹中利用高速纹影摄像法和球形扩展火焰研究了常压下不同燃空当量比和初始温度时2，5-二甲基呋喃～空气混合气的层流火焰特性，获得了拉伸和无拉伸火焰传播速率，无拉伸层流燃烧速率和马克斯坦长度。研究结果表明；2，5-二甲基呋哺-空气混合气的无拉伸火焰传播速率和无拉伸层流燃烧速率在燃空当量比1．2附近达到最大值，它们都随着初始温度的增加而增加。随着初始温度的增加，无拉伸火焰传播速率的峰值位置向浓混合气（燃空当量比增大）的方向移动。随着燃空当量比的减小和初始温度的增加，马克斯坦长度增加，表明火焰前峰面的稳定性增强。基于实验结果数据，拟合得到了2，5-二甲基呋哺-空气混合气的无拉伸层流燃烧速率的关系式。

英文摘要：

Laminar burning characteristics of 2,5-dimethylfuran （DMF）-air premixed mixtures at different initial temperatures and equivalence ratios were studied by using a constant volume combustion chamber and high-speed schlieren photograph system. The stretched/unstretched flame propagation speed, laminar burning velocity and Markstein length were obtained in this study. The results show that both unstretched flame propagation speed and laminar burning velocity give their peak values near the equivalence ratio of 1.2, and they increase with the increase of initial temperature. With the increase of initial temperature, the peak of unstretched flame propagation speed moves to the rich mixture side. The Markstein length decreases with the increase of equivalence ratio, while it increases with the increase of initial temperature. Based on the experimental data, a formula to calculate the laminar burning velocities of 2,5-dimethylfuran-air mixtures is provided.