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Investigation on the ablation performance of EPDM insulation material under dense particle stream

机译：EPDM绝缘材料在致密颗粒流下的烧蚀性能研究

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摘要

The ablation experiment for the EPDM insulation material is conducted 17 times based on the ground test solid rocket motor(SRM) for dense particle flow simulation in the SRM combustion chamber. The effect of particle flow on the material abaltion rate is researched, the carbide morphology of the material is investigated by scanning electron microscopy, and the relation between the particle flow parameters and the microstructure of the carbide material is obtained. The results indicate that :(1) there is a critical value for the particle velocity ,When the particle velocity below the critical value, the particle velocity have a little effect on the abation rate, when the particle velocity above the critical value, the abation rate increases rapidly with the particle velocity.(2)based on the relation between particle flow parameters and the matreial ablation rate, a engeering prediction model is proposed for the EPDM ablation rate through mathematical regression analysis;(3) the carbide morphology differs a lot under various particle flow parameters;(4) the effect of fiber layer in the EPDM on the ablation rate is analysed, and it is found that the ablation rates are almost the same for different fiber layer mode, Under harsh conditions, the fiber vertical layer mode is better than fiber parallel layer mode。
机译：基于地面试验固体火箭发动机（SRM），对EPDM绝缘材料进行了17次烧蚀实验，以模拟SRM燃烧室中的致密颗粒流动。研究了颗粒流动对材料硬质合金化率的影响，通过扫描电子显微镜研究了材料的碳化物形态，得出了颗粒流动参数与碳化物材料微观结构之间的关系。结果表明：（1）粒子速度有一个临界值，当粒子速度低于临界值时，粒子速度对消融速率影响不大;当粒子速度高于临界值时，粒子的消融速度不明显。速率随颗粒速度的增加而迅速增加。（2）基于颗粒流参数与材料烧蚀率之间的关系，通过数学回归分析提出了EPDM烧蚀率的工程预测模型;（3）碳化物形态差异很大。在不同的颗粒流参数下;（4）分析了EPDM中纤维层对烧蚀率的影响，发现在不同的纤维层模式下烧蚀率几乎相同，在苛刻的条件下，垂直纤维层模式优于光纤并行层模式。

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