RP-3 航空煤油与藻基燃油在层流扩散火焰中碳烟生成对比研究

关键词:层流扩散火焰；藻基燃油；航空煤油；火焰形态；火焰温度；碳烟

关键词:  层流扩散火焰  藻基燃油  航空煤油  火焰形态  火焰温度  碳烟

Key words:  Laminar diffusion flame  Algae-based fuel  Aviation kerosene  Flame form  Flame temper?ature  Soot

摘要:

为了促进藻基生物质航空替代燃料在实际发动机中的应用，得到更多它与传统航空煤油在基础燃烧性能方面差异的实验数据，对比研究了藻基燃油与RP-3航空煤油，两种燃油在相同的工况下形成层流扩散火焰，采用直接采样法采集碳烟颗粒和中间气体成分进行分析。研究结果表明，在本研究工况下，RP-3航空煤油与藻基燃油的火焰高度分别为33.5mm和34.5mm；RP-3航空煤油的表观亮度高；藻基燃油在各个火焰测点的温度都高于RP-3航空煤油，两者的最高温度分别为1453.6K和1405.3K，其数值都与对应的绝热火焰温度相差较多，其原因主要为大量碳烟的辐射和氮气载气吸热；同一火焰位置测点，藻基燃油形成的层流扩散火焰中碳烟颗粒的粒径、碳烟数密度都比RP-3航空煤油少。中间气体的GC/MS分析结果表明，RP-3航空煤油火焰中易形成环芳香烃的短链烃类，如C4H2，C3H4小分子烃类含量比藻基燃料多，进而更加容易生成碳烟。

Abstract:

In order to promote the application of algae-based biomass aerospace alternative fuels in actual engines and obtain more experimental data on its differences in basic combustion performance from conventional aviation kerosene, the algae-based fuel and the RP-3 aviation kerosene in the nitrogen-dilution laminar diffusion flame were comparatively studied. The soot particles and intermediate gas components were collected by direct sampling method for analysis. The results show that under the experimental conditions, the height of the RP-3 avi?ation kerosene and the algae-based fuel are respectively 33.5mm and 34.5mm; the apparent brightness of aviation kerosene is higher; the flame temperature of the algae-based fuel at each flame measurement point is higher than that of the RP-3 aviation kerosene flame, and the peak temperatures of them are respectively 1453.6K and 1405.3K, which is different from the adiabatic flame temperature. The main reasons for this are the emission of soot and the heat absorption of nitrogen carrier gas，at the same flame position measurement point, the particle size and soot number of soot in the laminar diffusion flame formed by the algae-based fuel is less than that of the RP-3 aviation kerosene. The GC/MS analysis of the intermediate gas shows that the short-chain hydrocarbons that easily form cyclic aromatics in the RP-3 aviation kerosene flame, such as C4H2, C3H4 small-molecule hydro?carbons, are more than algae-based fuels, and thus more easily generate carbon soot.