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Experimental Study of Vitiation Effects on Combustion Characteristics of a Supersonic Combustor

机译：通风对超音速燃烧器燃烧特性影响的实验研究

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An experimental study was conducted to characterize the effects of vitiate species (H2O and CO2) on supersonic combustion. These species were added to an initially clean airflow that was supplied by an electrically heated direct-connected facility. Wall pressures were measured by pressure sensors, combined with combustion optical images, and the influence of major vitiate species (H2O and CO2) on supersonic combustion was analyzed. Experimental results showed that the presence of vitiate species decreased combustor pressures by 3% to 30% for the same fuel equivalence ratio. The combustion flame images indicated that the flame-spreading angle decreased with the increase of the molar fraction of H2O and CO2, and when the molar fraction of CO2 was increased to 3.5%, an illogical oscillation, specifically embodying as the flame round switching between the upstream cavity and the downstream cavity, could be observed in the combustion, which might possibly cause the flame extinction.
机译：进行了一项实验研究，以表征玻璃酸盐种类（H2O和CO2）对超音速燃烧的影响。将这些物质添加到最初清洁的气流中，该气流由电加热的直连设备提供。通过压力传感器测量壁面压力，并结合燃烧光学图像，分析了主要的玻璃酸盐种类（H2O和CO2）对超音速燃烧的影响。实验结果表明，在相同燃料当量比的情况下，存在葡萄酸盐的物质使燃烧室压力降低了3％至30％。燃烧火焰图像表明，火焰扩散角随H2O和CO2摩尔分数的增加而减小，当CO2摩尔分数增加至3.5％时，出现不合逻辑的振荡，具体表现为火焰之间的轮回切换。在燃烧中可以观察到上游腔和下游腔，这可能导致火焰熄灭。

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