用于稀薄气体超高声速流场二维参数诊断的光学新方法

The NH radicals will be employed as target molecules in the new Molecular Tagging Velocimetry (NH-MTV) for the two-dimensional (2D) in-situ diagnostics of velocity on the rarefied gas wind tunnel which owns the extremely low particle- number-density and the hypersonic speed. The Molecular Tagging Velocimetry is based on the technique of PLIF (Planar Laser Induced Fluorescence) so, it also can be used to the 2D measurements of temperature (based on NO radicals) in the rarefied gas wind tunnel. Furthermore, the innovative flow tagging technique not only possesses rather high practicability and facility, but also has strong expandability and high feasibility.

项目拟采用PLIF(Planar Laser Induced Fluorescence)技术为基础，NH/NO自由基为荧光示踪粒子，开发一种单束激光的新分子标记测速法(Molecular Tagging Velocimetry，MTV)，以实现对稀薄气体超高速流场在线的二维速度/温度分布测量。在满足稀薄气体研究领域迫切的实验测量需求的同时，也为超低密度超高声速等极端条件下的流场提供一种操作便利、拓展性宽又极具实用价值的光学诊断新方法。

项目采用PLIF(Planar Laser Induced Fluorescence)技术为基础，NH/NO自由基为荧光示踪粒子，开发了一种单束激光的分子标记测速法(Molecular Tagging Velocimetry，MTV)，并将此技术与PLIF测温技术应用于稀薄气体电弧风洞和高焓爆轰激波风洞等大型地面风洞设备的在线测量中，不仅实现了对长时间稀薄气体超高速流场，同时对脉冲式高焓激波爆轰风洞产生的短脉冲式低密度超高速流场也实现了在线二维速度/温度测量。在满足稀薄气体研究领域迫切的实验测量需求的同时，也为低密度超高声速等极端条件下的流场建立了一种操作便利、拓展性宽又极具实用价值的光学诊断新方法。