Measurement of three-dimensional temperature and soot volume fraction for RP-3 jet fuel flame
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摘要:
RP-3航空煤油是航空发动机的常用燃料之一，火焰温度及碳烟浓度分布作为反映燃烧状态最直接的参数，是燃料优化配比的重要数据支撑。针对三维测量中，重建路径计算的准确性受相机位姿影响的问题，提出了一种将三维辐射成像法与相机立体标定技术相结合的测量方法。数值模拟结果表明，所提方法可以在提供较高的空间分辨率的同时保证测量结果的可靠性。利用标定后的六相机测量系统，对RP-3、空气预混火焰进行了实验测量，获得了其三维温度及碳烟浓度分布。测量的空间分辨率为$1 \;{\mathrm{mm}}\times1 \;{\mathrm{mm}}\times1 \;{\mathrm{mm}} $，重建与热电偶测量温差的标准不确定度为0.58 K，证明了测量方法的精确性。
Abstract:RP-3 jet fuel is one of the frequently utilized fuels in aviation engines. Temperature and soot volume fraction distribution of flame are the vital data support for fuel optimization, which can directly indicate the state of combustion. The precision of the reconstruction path in three-dimensional measurement was influenced by camera position and attitude. A novel method that combines the radiation imaging system and the camera stereo calibration technology was proposed to address this problem. According to the results of numerical simulation, the method could not only guarantee the accuracy of measurement results, but also provide high spatial resolution. The experimental measurement of RP-3 and air premixed flame were carried out. The three-dimensional temperature and soot volume fraction distribution were also obtained by the calibrated six-camera system. The spatial resolution was $1 \;{\mathrm{mm}}\times $$ 1 \;{\mathrm{mm}}\times1 \;{\mathrm{mm}} $, and the uncertainty of temperature difference between reconstructed and thermocouple measured temperature was 0.58 K, demonstrating the accuracy of the method.
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Key words:
- RP-3 jet fuel /
- CCD camera /
- camera stereo calibration /
- temperature /
- soot volume fraction
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图 4 相机位姿校正对重建结果的影响
Figure 4. Effect of camera position correction on reconstruction results
图 6 重建温度及碳烟浓度分布
Figure 6. Temperature reconstruction and soot volume fraction distribution
图 7 温度及碳烟浓度层重建分布趋势
Figure 7. Trend of reconstruction temperature and soot volume fraction for layer
图 8 重建温度与热电偶测量温度对比
Figure 8. Temperature comparison between reconstruction and thermocouple
表 1 相机位姿标定结果
Table 1. Camera position calibration results
相机 平移矩阵/mm 旋转矩阵/(°) x y z $ \alpha $ $ \beta $ $ \theta $ 理论值 实际值 理论值 实际值 理论值 实际值 理论值 实际值 理论值 实际值 理论值 实际值 相机1和2 113.5965 109.2632 −63.27 −63.3203 0 0.1341 0 0.5695 0 0 −60 −60.3141 相机1和3 225.1667 221.2563 3.4641 1.0527 0 0.2493 0 −0.2929 0 0 −120 −119.0782 相机1和4 223.1667 225.0230 133.4641 135.7647 0 0.1187 0 0.5509 0 0 −180 −181.9560 相机1和5 109.5833 114.1136 196.7321 199.1433 0 0.0825 0 0.3721 0 0 −240 −238.9791 相机1和6 −2.0000 −0.4152 130 128.2231 0 0.2196 0 −0.5867 0 0 −300 −300.6856 
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