富氧环境下绝热层烧蚀模型

采用模拟固体火箭冲压发动机补燃室富氧环境的试验系统,测试了几种绝热层材料不同氧含量环境下的烧蚀特性。烧蚀过程中燃气中的氧化性组分会渗入炭化层内部,在炭化层内的孔隙中与材料发生放热的化学反应,大量消耗碳,加剧了烧蚀的过程。通过试验结果分析,建立了以基体层、热解层、炭化层为基础的富氧烧蚀模型。应用该模型预估了试验所用绝热层材料的烧蚀率,计算值与试验值较为一致。

Ablation model of insulation in oxygen-rich environment

The ablation properties of several insulation materials in different oxygen-content environments were measured with atest system which can simulate the oxygen-rich environment of secondary combustor of solid rocket ramjet.The oxidizing ingredientsin gas penetrate into charred layer and react exothermally with the materials in charred layer void during ablation;the large con-sumption of carbon intensifies the ablation process.Through analysis of test results,an oxygen-rich ablation model based on matrixlayer,pyrolytic layer and charred layer was established.The ablation rate of insulation samples was predicted by the ablation mod-el,and computation results were almost consistent with test data.