Jet combustion of premixed propane-air mixtures is frequently encountered in various devices. In the present study, the flame is investigated by methods of the Hilbert optics. The diagnostic technique adapted to studying combustion products is based on visualization of phase perturbations induced in the probing light field by the examined medium with the use of polychromatic Hilbert and Foucault-Hilbert transforms combined with pixel-by-pixel processing of the dynamic structure of the recorded images. The diagnostic setup is based on the standard IAB-463M device with modified systems of optical filtration, source, and data processing. The dynamic phase structure of the propane-air flame is visualized. The temperature at reference points of the burning jet is measured by thermocouples. On axisymmetric segments, the phase function is recovered from the Hilbert curves, and the temperature field of the flame is retrieved by using the inverse Abel transform.

中文翻译：

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用希尔伯特光学方法恢复预混丙烷-空气混合物燃烧时的温度场

在各种设备中经常遇到预混丙烷-空气混合物的喷射燃烧。在本研究中，火焰是通过希尔伯特光学方法研究的。适合研究燃烧产物的诊断技术基于对探测光场中由被检查介质引起的相位扰动的可视化，使用多色希尔伯特和傅科-希尔伯特变换，结合逐像素处理动态结构的动态结构。记录的图像。诊断设置基于标准 IAB-463M 设备，具有改进的光学过滤、源和数据处理系统。丙烷-空气火焰的动态相结构可视化。燃烧射流参考点的温度由热电偶测量。在轴对称段上，