Experimental study on thermal oxidation coking characteristics of aviation kerosene in additively manufactured helical tubes
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摘要:
为得到环境温度、入口雷诺数和磨粒流处理工艺对RP⁃3航空煤油氧化结焦特性的影响，针对增材制造（3D打印）螺旋圆管，采用了恒定环境温度的试验方法，开展了RP⁃3航空煤油热氧化结焦试验研究。试验结果表明：当入口雷诺数和试验时间保持恒定时，无论燃油处于静止还是流动状态，燃油结焦速率和总结焦量都随着环境温度的增加而增大；当试验件壁温和试验时间保持不变时，燃油处于流动状态下，燃油结焦速率和总结焦量随着入口雷诺数的增大呈现先增加后减少的变化趋势。采用磨粒流处理后，燃油在试验件内的结焦速率大于基准工况，总结焦量是基准工况下的1.17倍。对试验件内表面进行磨粒流处理不利于抑制结焦沉积。
Abstract:For the purpose of obtaining the influence of ambient temperature，inlet Reynolds number and abrasive flow treatment on the coking characteristics of RP⁃3 aviation kerosene，the RP⁃3 aviation kerosene thermal oxidation coking tests were carried out in additively manufactured （3D printed） helical tubes through the testing way of constant ambient temperature.The test results showed that when inlet Reynolds number and test time remained constant，the deposition rate and the total coking amount of the fuel increased with the increase of ambient temperature，regardless of whether the fuel was in a static or flowing state；when the fuel was in a flowing state，as inlet Reynolds number increased，the deposition rate increased first and then decreased with constant wall temperature and test time.After abrasive flow treatment，the deposition rate of the fuel in the test tube was greater than that of the fuel under baseline working condition，and the total coking amount of the fuel was 1.17 times the total coking amount of the fuel under baseline working condition.The abrasive flow treatment on the inner surface of the test tube was not conducive to the inhibition of coking deposition.
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图 2 管壁温度测点分布示意图
Figure 2. Schematic diagram of the distribution of wall temperature measuring points
图 3 管壁温度测点分布实物图
Figure 3. Photograph of the distribution of wall temperature measuring points
图 4 试验件几何示意图（单位：mm）
Figure 4. Schematic diagram of the geometry of experimental tubes （unit:mm）
图 5 某个试验件进行工业CT扫描重建后提取出的流道形状图
Figure 5. Shape of the flow channel extracted after the industrial CT scan and reconstruction of one experimental tube
图 6 磨粒流处理后的试验件进行工业CT扫描重建后提取出的流道形状图
Figure 6. Shape of the flow channel extracted after the industrial CT scan and reconstruction of one experimental tube treated by abrasive flow
图 8 环境温度对壁温的影响（Re=0,t=12 h）
Figure 8. Effects of ambient temperature on wall temperature （Re=0,t=12 h）
图 9 环境温度对总结焦量的影响（Re=0,t=12 h）
Figure 9. Effects of ambient temperature on total coking amount （Re=0,t=12 h）
图 10 环境温度对结焦速率和壁温的影响（Rein=3 000,t=4 h）
Figure 10. Effects of ambient temperature on deposition rate and wall temperature （Rein=3 000,t=4 h）
图 12 环境温度对总结焦量的影响（Rein=3 000,t=4 h）
Figure 12. Effects of ambient temperature on total coking amount （Rein=3 000,t=4 h）
图 13 入口雷诺数对结焦速率和壁温的影响（Tw5=500 K,t=4 h）
Figure 13. Effects of Reynolds number on deposition rate and wall temperature （Tw5=500 K,t=4 h）
图 14 入口雷诺数对总结焦量的影响（Tw5=500 K,t=4 h）
Figure 14. Effects of Reynolds number on total coking amount （Tw5=500 K,t=4 h）
图 15 磨粒流处理工艺对结焦速率和壁温的影响（Rein=3 000,t=4 h）
Figure 15. Effects of abrasive flow treatment on deposition rate and wall temperature （Rein=3 000,t=4 h）
表 1 Hastelloy X 合金的化学成分
Table 1. Chemical compositions of Hastelloy X
成分 质量分数 成分 质量分数 C 0.072 P 0.003 Cr 21.49 Cu 0.003 Co 1.61 Al <0.002 Mo 9.04 Ti 0.012 W 0.55 O 0.007 2 Fe 18.86 N 0.006 B 0.000 2 Ni 47.79 Mn 0.015 Si 0.2 S 0.003 
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表 2 Hastelloy X 合金的物理性能
Table 2. Physical properties of Hastelloy X
参数 数值 295 K密度/（g/cm3） 8.22 熔点/K 1 533.15~1 628.15 366 K导热系数/（W/（m·K）） 11 366 K比定压热容/（J/（kg·K）） 490
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表 3 RP⁃3航空煤油热氧化结焦试验工况
Table 3. Working conditions for thermal oxidation coking experiments of RP⁃3 aviation kerosene
工况 入口雷诺数Rein 壁温5Tw5/K 环境温度Ts/K 进出口压差Δp/kPa 试验时间t/h 备注 1 0 410 423 12 静止 2 0 420 427 12 静止 3 0 430 432 12 静止 4 3 000 440 722 79.51 4 变环境温度 5 3 000 540 919 79.20 4 变环境温度 6 3 000 500 882 73.93 4 基准工况 7 500 500 674 4.52 4 变雷诺数 8 1 000 500 730 10.57 4 变雷诺数 9 3 000 500 836 55.67 4 磨粒流处理
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表 4 增材制造螺旋管路流道面积
Table 4. Flow channel area of additive manufacturing helical tubes
i 流道面积/mm2 试验件1 试验件2 试验件3 试验件平均 磨粒流处理 1 527.89 538.69 539.21 535.26 533.19 2 530.10 537.37 542.30 536.59 534.19 3 530.05 540.24 541.70 537.33 536.82 4 533.46 539.89 543.31 538.89 537.94 5 534.98 540.91 542.98 539.62 537.90 6 534.89 543.16 544.18 540.74 536.85 7 534.73 543.62 541.96 540.10 536.42 8 533.65 541.39 539.22 538.09 532.97 9 532.96 539.64 539.06 537.22 530.45 10 528.39 536.65 538.50 534.51 528.60
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