基于滤波瑞利散射技术的带压燃烧场温度测量实验研究

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。

Experimental study on temperature measurement of high pressure combustion based on filtered Rayleigh scattering technology

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.