Experimental study on temperature measurement of high pressure combustion based on filtered Rayleigh scattering technology
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摘要: 为实现高压、受限空间条件下燃烧火焰二维温度场的测量，研究了基于碘分子超精细吸收凹陷的滤波瑞利散射技术。设计了一套滤波瑞利散射温度测量装置，主要由种子激光注入Nd：YAG激光器、碘分子滤波池、ICCD相机等组成。利用该测量装置，在高压火焰炉上开展了0.1~0.5MPa条件下的甲烷/空气预混火焰温度测量实验，结果表明：滤波瑞利散射测温技术能有效抑制米散射和背景杂散光的干扰，能在受限空间和带压条件下获得瞬态燃烧火焰温度场的分布，并且温度测量的相对不确定度优于15%；与热电偶温度测量实验的结果进行了对比，两者的偏差小于10%。因此，有望将滤波瑞利散射测温技术应用于发动机燃烧场温度诊断实验。Abstract: In order to explore the temperature measuring ability under the high-pressure condition and in a confined space, the filtered Rayleigh scattering technique is developed based on the iodine molecular ultrafine absorption. The filtered Rayleigh scattering temperature measuring apparatus, consisted of the seed laser, the Nd:YAG laser, the iodine molecule filter and the ICCD camera, is designed. And the iodine filter is used to remove the stray light interference from the soot and wall reflection. Moreover, this apparatus is applied on a high-pressure gas combustor (0.1~0.5MPa) to obtain the temperature distribution above the flat burner quantitatively. The results show that the relative uncertainty in the single-shot imaging is estimated to be about 15%. And a better than 10% agreement to the single point measurement is achieved by the thermocouple. Therefore, the filtered Rayleigh scattering technique is expected to be applied in the temperature measurement of the engine combustion.
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图 1 碘分子对激光散射信号吸收示意图
Figure 1. Schematic of iodine transmission profile convoluted with the molecular Rayleigh scattering spectral profile
图 2 分子滤波瑞利散射温度测量光路示意图
Figure 2. Schematic of optical arrangement for FRS temperature measurements
图 3 (a) 高温高压火焰炉实物图；(b)McKenna火焰炉及其上方实验布局尺寸图
Figure 3. (a) Schematic of high temperature and pressure combustion burner; (b) The size of McKenna burner and the experiment layout
图 4 瑞利散射光收集成像装置实物图
Figure 4. Schematic of Rayleigh scattering collecting and imaging system
图 5 不同压强下FRS相对强度与温度的对应关系
Figure 5. Normalized FRS signal versus flow temperature curve under different pressures
图 6 有/无滤波池条件的瑞利散射图像
Figure 6. Scattering images without and with the iodine filtering cell
图 7 ICCD相机测得的瑞利散射信号强度S(20幅累加)与腔体压强p的关系
Figure 7. The relation between the Rayleigh scattering signal S and the chamber pressure p
图 8 (a) 经滤波瑞利散射技术得到的火焰温度分布图像；(b)不同腔压下，火焰炉上方1.5cm处的火焰温度分布图; (c)不同探测位置处，热电偶和FRS (50幅平均)温度测量结果
Figure 8. (a) Images of combustion temperature distribution by the FRS technique; (b) Distribution of combustion temperature at the height (1.5cm) above the burner; (c) Comparison of the temperature results between the FRS technique and the thermocouple
图 9 腔压p=0.50MPa时，不同时间下的火焰瑞利散射信号分布图像
Figure 9. Images of combustion Rayleigh scattering signal distribution with the chamber pressure p=0.50MPa, at different times
表 1 带压燃烧实验参数(压强p，甲烷和空气流量QCH4、QAir，当量比φ及其预混燃气总流速vpremixed)
Table 1. Parameters for combustion experiments (Chamber pressure p, flow rates for air through burner QAir and for fuel CH4 QCH4, equivalence ratios φ, premixed gas velocity vpremixed)
p/MPa QCH4/SLM QAir/SLM φ vpremixed/(cm·s-1) Case 1 0.11 0.6 4.8 1.19 16.67 Case 2 0.30 0.6 4.8 1.19 6.11 Case 3 0.50 0.6 4.8 1.19 3.67 
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