正十六烷及丁基苯对燃烧排气冒烟影响的试验研究

Experimental Research on Effect of n-Hexadecane and Butyl Benzene on Exhaust Smoke of Combustion

生物原油与传统航空煤油在长直链烷烃与芳香烃含量上具有显著差异,为了研究航空替代燃料在燃烧排放方面的特性,选择了正十六烷和丁基苯两种代表性物质作为添加物,研究其对燃烧过程中排气冒烟的影响。另外,研制了适用于航空发动机燃烧室地面试验的颗粒物稀释采样装置,该装置采用了先进的稀释采样技术,模拟发动机排气进入到环境大气中的真实变化过程,具有全面性、连续性、小型化的特点。试验结果显示,芳香烃类物质的含量会显著提高颗粒物的排放浓度,而长直链烷烃则会带来更大的颗粒物微团。稀释采样装置为航空发动机排放测试提供了新的技术途径,试验结论为人工合成航空替代燃料以降低排气冒烟提供了技术支持。

To study the characteristics of combustion emissions of aviation alternative fuels, two representative substances, n-hexadecane and butyl benzene, are blended with kerosene to study the effect of exhaust smoke. In addition, a dilution sampling device for ground experiment of aero- engine combustion chamber is developed. The device adopts the advanced dilution sampling technology to simulate the real change precess of the exhaust gas entering the ambient air. The experimental results show that the content of aromatic hydrocarbons significantly increases the concentration of particulate matter, while the long straight-chain alkanes bring larger particles micelles. This dilution sampling device provides a new technical approach for aero-engine emission test, and the experimental conclusion provides technical support for artificial synthesis of aviation alternative fuel to reduce exhaust smoke.