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在复杂的燃烧流场等试验研究中,平面激光诱导荧光技术(PLIF)被用于特定气体分子浓度分布、火焰构造和温度分布的测量。基于双色激光诱导荧光测温原理,设计了双激发PLIF系统,选取两条合适的OH自由基激励线,定量测量了甲烷-空气预混火焰的二维瞬态温度场分布。实验中,通过对两个激光脉冲功率和激光轮廓分布监控以及双ICCD成像的空间位置校正,提高了测量的精细程度。给出了测量结果,并与稳态燃烧场火焰的热电偶测量结果进行了对比,不确定度优于5%,这种二维瞬态测温技术能够满足超声速燃烧诊断中的应用。
In the experimental study of complex combustion flow fields, planar laser-induced fluorescence (PLIF) was used to measure gas molecule concentration distribution, flame structure and temperature distribution. Based on the principle of two-color laser-induced fluorescence thermometry, a dual-excitation PLIF system was designed. Two suitable OH radical excitation lines were selected to quantitatively measure the two-dimensional transient temperature distribution of methane-air premixed flame. In the experiment, the precision of the measurement was improved by monitoring the power and laser profile distribution of the two laser pulses and the spatial position correction of the dual ICCD imaging. The measurement results are given and compared with the thermocouple measurement results of steady combustion field flame, the uncertainty is better than 5%. This two-dimensional transient temperature measurement technology can meet the application of ultrasonic combustion diagnosis.