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采用激光测距技术,对地面实验后的石墨/高硅氧酚醛复合喷管烧蚀形貌进行了测量,获得了喷管内表面的三维烧蚀结构图谱。之后,基于MATLAB语言编制的数据重构程序,对激光扫描仪获得的数据点云重构,得到喷管内表面烧蚀率的三维分布。在喷管收敛段内,沿流动方向高硅氧烧蚀速率呈增加趋势,扩张段内沿流动方向高硅氧烧蚀速率呈减小趋势。在喷管壁面上出现了2个烧蚀凹坑,一个位于收敛段内两种材料的交界面处,另一个位于扩张段内2种材料交界面的下游。在收敛段内的交界面处,石墨喉衬的烧蚀率异常大,除此位置外,石墨喉衬的烧蚀速率沿流动方向先增加、后减小,在喉部上游达到最大值。喷管喉衬周向烧蚀规律基本一致,2种材料交界面处的烧蚀率在周向上有一定偏差。此外,定性分析了收敛段和扩张段中高硅氧酚醛和石墨交界处的烧蚀行为及其与当地的流场结构的关系。
The laser ablation technology was used to measure the ablation morphology of graphite / high-oxygen phenolic composite nozzle after ground test, and the three-dimensional ablation structure of the inner surface of the nozzle was obtained. After that, based on the data reconstruction program compiled by MATLAB language, the data point cloud obtained by the laser scanner is reconstructed, and the three-dimensional distribution of the ablation rate of the inner surface of the nozzle is obtained. In the convergent section of the nozzle, the high silicon oxide ablation rate increases along the flow direction, and the high silicon ablation rate decreases along the flow direction in the expanding section. There are two ablation pits on the wall of the nozzle. One is located at the interface of the two materials in the convergent section and the other is located downstream of the interface of the two materials in the divergent section. The ablation rate of graphite throat lining is abnormally large at the interface in the converging section. Except for this position, the ablation rate of graphite throat lining firstly increases along the flow direction and then decreases and reaches the maximum at the upstream of the throat. The rule of circumferential erosion of nozzle lining is basically the same, and the ablation rate at the interface of two kinds of materials has a certain deviation in the circumferential direction. In addition, the ablation behavior of high-density oxygen-free phenolic and graphite in the convergent section and the extended section and their relationship with the local flow field structure were qualitatively analyzed.