宋俊玲, 姜雅晶, 饶伟, 孙秀辉, 陈建军. 超声速燃烧场高密度光学测量环设计方法研究[J]. 红外与激光工程, 2021, 50(10): 20210063. DOI: 10.3788/IRLA20210063
引用本文: 宋俊玲, 姜雅晶, 饶伟, 孙秀辉, 陈建军. 超声速燃烧场高密度光学测量环设计方法研究[J]. 红外与激光工程, 2021, 50(10): 20210063. DOI: 10.3788/IRLA20210063
Song Junling, Jiang Yajing, Rao Wei, Sun Xiuhui, Chen Jianjun. Design of a high-resolution optical measuring ring for supersonic combustion flow field[J]. Infrared and Laser Engineering, 2021, 50(10): 20210063. DOI: 10.3788/IRLA20210063
Citation: Song Junling, Jiang Yajing, Rao Wei, Sun Xiuhui, Chen Jianjun. Design of a high-resolution optical measuring ring for supersonic combustion flow field[J]. Infrared and Laser Engineering, 2021, 50(10): 20210063. DOI: 10.3788/IRLA20210063

超声速燃烧场高密度光学测量环设计方法研究

Design of a high-resolution optical measuring ring for supersonic combustion flow field

  • 摘要: 超燃冲压发动机激光吸收光谱测量系统目前主要采用分立式光学探头形式与发动机机体固定,但是受到探头尺寸的限制,无法获得高分辨率的流场信息。文中设计了一种基于自由曲面透镜和透镜阵列相结合的燃烧场高密度光学测量环。该测量环采用两层结构,发射端分别位于每条边最边缘位置,激光准直透镜和自由曲面透镜形成扇形光束,扇形光束穿过被测流场后,经过楔形镜偏转和聚焦透镜聚焦,进入接收光纤后传送至探测器。测量环接收单元最小间隔为5 mm,实现了在5 cm×7 cm空间内88条光线的密集排列。重点讨论光学系统光线分布设计方案,并给出收发端结构设计方案,实验结果表明,光线利用效率大于50%,光线总传输效率大于55%。设计的高密度光学测量环可以直接与发动机机体相衔接,避免环境因素干扰,可以实现对超燃冲压发动机隔离段、燃烧室出口等处温度、组分浓度的二维分布测量。

     

    Abstract: The separate optical probes have been widely used in scramjet laser absorption spectroscopy measured system. High resolution flow field cannot be obtained because of the limitation of the probe size. A high-resolution optical measuring ring based on free-curved lens and cylindrical lens was designed for combustion flow field. The beam distribution was determined by numerical simulation. The measuring ring adopted double-layer structure, the transmitters were located at the most edge of each edge. The fan-beam was formed by collimating lens and free-form lens. And then after passing the measuring flow field, the laser beam was defected by the wedge lens and focused by the focusing lens. The measuring ring receiving unit minimum interval was 5 mm, achieved dense array of 88 beams in 5 cm×7 cm space. The beam distribution of the optical system was discussed. The structural design scheme suitable for engine measurement was given. The measurement result shows that the light efficiency is greater than 50%, the total transmission efficiency is greater than 55%. The high-resolution optical measuring ring can be directly connected with the engine body to avoid the interference of environmental factors. The two-dimensional distribution of temperature and concentration in the isolation and outlet of the combustion can be measured.

     

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