研究目的
To develop a robust non-contacting full-field optical technique for in-situ 3D shape and recession measurements of ablative materials in high-temperature wind tunnel tests.
研究成果
The UV stereo-DIC technique effectively suppresses thermal radiation and enables in-situ 3D shape and recession measurements in high-temperature ablation tests, with results validated against post-test measurements. It shows potential for providing critical data for thermal protection system design.
研究不足
The technique may be affected by changes in natural texture due to high-speed airflow scouring, and accuracy depends on image resolution and displacement measurement precision. Heat haze was not an issue in this vacuum environment but could be in others.
1：Experimental Design and Method Selection:
A UV stereo-DIC system was developed to suppress thermal radiation and use natural surface textures as speckle patterns for 3D shape measurement. Stereo-DIC algorithms were employed for correlation analysis.
2：Sample Selection and Data Sources:
A graphite-based blunt cone sample with a density of 2.02 g/cm3 was used. Images were captured during ablation tests in an arc-heated wind tunnel.
3：02 g/cm3 was used. Images were captured during ablation tests in an arc-heated wind tunnel.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: UV stereo-DIC system (including monochromatic UV lamp, bandpass filters, UV cameras), arc-heated wind tunnel (FD04), infrared spectrometer (MR1SC), and the blunt cone sample.
4：Experimental Procedures and Operational Workflow:
The system was calibrated with a re-projection error of 0.073 pixels. The sample was heated from room temperature to 1868 °C, and images were captured at 5 fps. An incremental stereo-DIC strategy was used for analysis.
5：073 pixels. The sample was heated from room temperature to 1868 °C, and images were captured at 5 fps. An incremental stereo-DIC strategy was used for analysis.
Data Analysis Methods:
5. Data Analysis Methods: Subset-based stereo-DIC algorithm with ZNSSD criterion, polynomial plane fitting for recession calculation, and statistical analysis of speckle patterns (average intensity and MIG).
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