Abstract: In order to study the thermal autoxidation coke characteristics of domestic RP-3 aviation kerosene in complex pipeline， this paper combined characteristics of typical pipeline inside the nozzle of aero-engine combustor， and a way of constant ambient temperature was used to test the thermal autoxidation coke characteristics of straight pipe， helix pipe and L-shaped pipe. The results show that amount of coke along straight pipe presents a trend of increasing first and then decreasing， and the peak of amount of coke appears in the middle and rear part of the test pipe. There is a large fluctuation in the amount of coke along the L-shaped pipe， and it maintains at a high level in the bending region. The distribution of amount of coke along helix pipe exhibits a double peak form. Comparing three structures， the helix pipe has the largest amount of coke per unit area . When the fuel inlet flow rate is 2m/s， it is about 3.46 times that of L-shaped pipe， and straight pipe has the smallest amount of coke per unit area.

Key words: Aero-engine;RP-3 kerosene;Fuel nozzle;Autoxidation coke;Typical pipeline

摘要： 为了研究国产RP-3航空煤油在复杂油路内的热氧化结焦特性，结合航空发动机燃烧室燃油喷嘴内部典型油路结构特点，针对直管、螺旋管和L形弯管三种结构油路，基于恒定环境温度的试验方法开展氧化结焦试验研究。研究结果表明：直管的沿程结焦量呈现先增大后减小的形式，其峰值出现在直管的中后部；L形弯管的沿程结焦量存在较大幅度的波动，结焦量在试验件弯曲段整体保持较高的水平，结焦峰值位置相较直管提前出现；螺旋管的沿程结焦量分布表现为明显的双峰值形式。三种油路中，螺旋管的单位面积结焦量最大，在燃油进口速度为2m/s时，其值约是L形弯管的3.46倍，直管的单位面积结焦量最小。

关键词: 航空发动机;RP-3航空煤油;燃油喷嘴;热氧化结焦;典型管路