燃料组分差异对贫油熄火边界的影响

为了推进替代燃料的多元化,扩大航空燃料的组分分布。以标准航空煤油为基准,研究了柴油和高沸点费托油对燃烧室贫油熄火边界的影响。实验采用单头部燃烧室,通过改变燃烧室进出口压力,研究其熄火边界的变化规律,并分析了其与理化性质和组成的关联关系。结果显示在220kPa的出口压力下,航空煤油的熄火性能略优于另外两种燃油,高沸点费托油相比航空煤油熄火边界窄5%,而在140kPa的低压条件下,高沸点费托油的熄火边界相比航空煤油拓宽了8%。分析得到整体上低沸点烷烃和直链烷烃的熄火性能较好。 

Influence of fuel composition difference on lean blow out

In order to promote the diversification of alternative fuels and expand the compositional distribution of aviation fuels, the single-head combustor was adopted to investigate the effects of diesel oil and high-boiling-point Fischer-Tropsch fuel (FT) on the lean blowout of combustor compared with standard jet fuel. The boundaries of lean blowout (LBO) were researched by changing the pressure at the inlet and outlet of the combustor, and the correlation of LBO with physical and chemical properties as well as compositions was discussed. The results showed thatthe LBO of jet fuel was slightly better than that of the alternative fuelsunder the outlet pressure of 220kPa, whilehigh boiling point Fischer-Tropsch fuels LBO was 5% narrower than that of jet fuels. At the pressure of 140kPa, the LBO of high boiling point Fischer-Tropsch fuel broadened by 8% than that of jet fuel. The analysis shows that low-boiling alkanes and straight-chain alkanes have a better performance in LBO.