| 李佳胜,金熠*,朱雨建,纪锋,文帅.基于吸收光谱的激波风洞驻室流场时空分辨测量[J].实验力学,2023,38(2):209~221 |
| 基于吸收光谱的激波风洞驻室流场时空分辨测量 |
| Spatial-temporal resolved measurement of the flow parameters in shock tunnel reservoir based on absorption spectroscopy |
| 投稿时间：2022-06-17 修订日期：2022-08-14 |
| DOI：10.7520/1001-4888-22-151 |
| 中文关键词: 激波风洞 吸收光谱 光学系统 虚拟旋转射线 |
| 英文关键词:shock tunnel absorption spectroscopy optical system virtual beam rotation |
| 基金项目:国家自然科学基金(U21B6003)资助 |
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| 中文摘要: |
| 发展非侵入、多维和多参数测量技术对于获取激波风洞的真实运行状态至关重要，本文基于TDLAS(Tunable Diode Laser Absorption Spectroscopy, 可调谐二极管激光吸收光谱)对激波风洞驻室开展时空分辨测量研究,提出了一种可在有限射线下实现轴对称流场空间分辨测量的虚拟旋转射线重建方法;对该方法进行重建仿真，验证了其可行性;设计了一套适用于激波风洞强振动环境的光学系统，基于该光学系统开展了吸收光谱实验。实验结果显示：激波风洞的驻室区内发生了激波的入射和反射，风洞有效运行时间约为10ms，与数值模拟结果基本吻合；管壁附着的液态水蒸发使得壁面附近流场温度降低95K；驻室横截面内温度的分布呈现中心高、边缘低的特征。 |
| 英文摘要: |
| It is of vital importance to develop non-invasive, multi-dimensional, and multi-parameter measurement techniques for obtaining the real running state of shock tunnel, so research on the spatial-temporal resolved measurement of shock tunnel reservoir is carried out based on TDLAS (tunable diode laser absorption spectroscopy). To achieve spatially resolved measurement of the axisymmetric flow field under limited beams, a virtual beam rotation reconstruction method is proposed and simulated reconstruction is performed to verify its feasibility. An optical system applicable to the strong vibration environment of a shock tunnel was designed, and an experiment was carried out based on it. The experimental results show that: shock incidences and reflections happen in the shock tunnel reservoir and the test duration of the shock tunnel is about 10ms, which is basically consistent with the numerical simulation results; flow temperature near the wall decreases by 95K due to the evaporation of water attached to the wall; temperature distribution in the cross-section is high in the center while lower in the margin. |
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