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- W4200423215 abstract "When C/SiC composites subjected to high-power laser irradiation under hypersonic airflow environment, “avalanche” phenomenon was found, i.e., the ablation rate was significantly higher than that under static air environment. To reveal this phenomenon, parallel experiments of laser ablation under static air, short-time and long-time hypersonic airflow environments were carried out. Ablation models including oxidation, sublimation and erosion considering coupling effects of airflow and C/SiC composites were introduced, and a coupled fluid-thermal-ablation numerical simulation procedure was proposed and carried out. The relationship between ablation rates and aerodynamic pressure was discussed, and the contributions of different ablation mechanisms were quantitively evaluated. In hypersonic airflow environments, sublimation rate was increased due to the decreased local pressure, and erosion rate was accelerated as a result of increased pressure head at downstream area. The combined effect of augmented sublimation and accelerated erosion accounted for the main reason of “avalanche” phenomenon under hypersonic airflow." @default.
- W4200423215 created "2021-12-31" @default.
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- W4200423215 date "2022-03-01" @default.
- W4200423215 modified "2023-10-15" @default.
- W4200423215 title "Decoupling mechanisms of “avalanche” phenomenon for laser ablation of C/SiC composites in hypersonic airflow environment" @default.
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- W4200423215 doi "https://doi.org/10.1016/j.ijthermalsci.2021.107414" @default.
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