氧浓度对斯特林发动机燃用不同燃料时燃烧火焰特征的影响

利用高速摄影技术，研究了以乙醇为燃料时斯特林发动机引射气流中氧浓度对燃烧的火焰长度、色度、燃烧速度以及燃烧稳定性等的影响.结果表明：在引射空气时，随着氧气浓度的提高，火焰的稳定性及火焰传播速度提高，燃烧火焰长度变短，火焰变得更明亮，且柴油火焰亮度比乙醇大；在有引射气流的作用下，氧浓度对燃烧特征参数的影响较小.

Effect of Oxygen Concentration on Combustion Flame of a Stirling Engine

Using high speed photo technique, the effect of the oxygen concentration on intake air of Stirling engine fueled with diesel and ethanol combustion flame was studied. The experimental results showed that as the oxygen concentration increased, the flame stability was improved and the combustion flame propagation speed was increased; as the oxygen concentration in intake air increased, the combustion flame length decreased and the flame lightness increased; the flame in the combustion chamber was brighter when fueled with diesel than fueled with ethanol. The oxygen concentration had an inconspicuous effect on combustion mode and flame cone angle when injected gas was used.