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对300余秒冲压发动机试验后的硅橡胶绝热层试验件残骸进行解剖分析,制样,测试了试验后烧蚀碳化层的密度、导热系数,并测量计算试验后发动机内部不同部位绝热层线烧蚀率。经与试验前实测数据进行对比,得出以下结论:硅橡胶绝热层在冲压发动机试验后,碳化层密度较原始材料增大,碳化层导热系数较原始材料降低;冲压发动机工作过程中绝热层的烧蚀是一个很复杂的过程,不同部位烧蚀情况差异较大,总的规律是头部较尾部烧蚀严重。并从理论上对此结论进行了解释。
After more than 300 seconds, the wreckage of the silicone rubber thermal insulation test piece after the stamping engine test was tested. The samples were tested for the density and thermal conductivity of the ablated carbonized layer after the test and the burn-in of the insulation layer in different parts of the engine after the test Erosion rate. After comparing with the measured data before the test, the following conclusions are drawn: After the rubber-rubber heat-insulating layer is tested by stamping engine, the density of carbonized layer increases compared with the original material, the thermal conductivity of the carbonized layer decreases compared with the original material; Ablation is a very complex process, ablation of different parts of the situation is quite different, the general rule is the head than the atrocious ablation. And this conclusion is explained theoretically.