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通过设计一个模拟试验得到一组与冲压试验中较一致的三元乙丙(EPDM)热防护材料背面温升曲线,该模拟试验中EPDM材料背面温度的测试状态与冲压试验中的一致,然后对模拟试验的物理模型进行了数值传热分析,该模拟结果与试验结果吻合的较好,说明传热模型的建立接近实际状况。根据该传热模型建立未安装传感器的自由物体的传热模型,模拟出自由物体背面温升曲线,由自由物体的背面温升曲线与模拟试验所测得的曲线相差得出在该测试状态下的误差值,由于模拟试验与冲压试验的测试状态相同,由传感器安装而造成的误差可以推广到冲压试验中,根据此误差值在一定程度上校正了冲压发动机EPDM防热材料的背面温升曲线。
By designing a simulation test, a set of temperature rise curves of the back surface of a EPDM thermal protection material which is more consistent with the stamping test are obtained. The temperature of the back surface of the EPDM material in the simulation test is consistent with that in the stamping test, The physical model of the simulation experiment is conducted numerical heat transfer analysis. The simulation results are in good agreement with the experimental results, indicating that the establishment of the heat transfer model is close to the actual situation. According to the heat transfer model, a heat transfer model of a free object without a sensor is established to simulate the temperature rise curve of the back surface of the free object. The difference between the temperature rise curve of the back surface of the free object and the curve measured by the simulation test results in that under the test condition , The error caused by the installation of the sensor can be generalized to the stamping test due to the same test condition of the simulation test and the stamping test. Based on the error value, the temperature rise curve of the back surface of the stamping engine EPDM heat-proof material is corrected to some extent .