燃料浓度分布激光诊断方法与应用

航空发动机内部燃料浓度分布情况影响其性能，诸如点火性能、燃烧效率、污染物生成和出口温度场等，因此，燃料浓度分布研究十分重要。近年来，基于激光的非接触测量与诊断技术快速发展，平面激光诱导荧光（PLIF）、Raman散射、Rayleigh散射、Mie散射、激光诱导击穿光谱（LIBS）、可调二极管激光吸收光谱（TDLAS）等非接触测量手段已成功应用于燃料浓度分布的诊断研究中。介绍了上述基于激光来诊断燃料浓度分布技术的基本工作原理及研究进展，分析对比了各种测量手段的优缺点，提出了基于单台高能量激光器同时测量多组PLIF组分、基于体激光诱导荧光（VLIF）发展V-Rayleigh散射和V-Mie散射技术等新的测量思路，展望了这几种激光诊断技术在燃料浓度分布研究方面的发展趋势，未来航空发动机内部的燃料浓度测量将会朝着高速瞬时演化过程的3D成像方向发展。

Method and Application of Laser Diagnostic of Fuel Concentration Distribution

The fuel concentration distribution in an aeroengine combustion chamber affects its performance, such as ignition perfor? mance, combustion efficiency, pollutant generation, and outlet temperature field. Therefore, it is very important to study the fuel concentra? tion distribution. In recent years, laser-based non-contact measurement and diagnosis technologies have developed rapidly. Non-contact measurement methods such as Planar Laser-Induced Fluorescence (PLIF), Raman scattering, Rayleigh scattering, Mie scattering, Laser-In? duced Breakdown Spectroscopy (LIBS), and Tunable Diode Laser Absorption Spectroscopy (TDLAS) have been successfully applied to the diagnosis of fuel concentration distribution. The basic operating principles and research progresses of the above technologies for diagnosing fuel concentration distribution are introduced. The advantages and disadvantages of various measurement methods are analyzed and com? pared. New ideas about the measurement of fuel concentration are put forward such as the simultaneous PLIF measurement of multiple com? ponents by applying a single high-energy laser, and the developments of V-Rayleigh scattering and V-Mie scattering technologies based on Volumetric Laser-Induced Fluorescence (VLIF). Finally, the outlook of the development trends of these laser diagnostic technologies in the research of fuel concentration distribution is provided. In the future, the measurement of fuel concentration will be developed towards 3D imaging of the high-speed transient evolution process.