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三元乙丙橡胶(EPDM)是一种烧蚀型碳化复合材料,通常用作发动机内绝热层。故对三元乙丙橡胶的传热性能进行了理论研究与试验验证。通过建立补燃室内三维流场模型与绝热层二维传热模型。对补燃室内伴随有化学反应的流场用计算流体软件FLUENT进行了仿真计算,仿真结果作为EPDM绝热层传热计算的热载荷,利用有限元软件ANSYS对EPDM绝热层传热过程进行了模拟。通过冲压地面联管试验对补燃室内绝热层传热烧蚀进行了试验研究。绝热层传热计算结果与联管实验结果基本一致,仿真计算结果可以在一定程度上给出绝热层背面的温升趋势。
Ethylene-propylene-diene monomer (EPDM) is an ablative carbonized composite that is commonly used as an engine insulation. Therefore, the heat transfer performance of EPDM has been theoretically studied and tested. By establishing a three-dimensional flow field model and two-dimensional heat transfer model of heat insulating layer in afterburning chamber, The computational fluid software FLUENT was used to simulate the flow field accompanied by chemical reactions in the afterburning chamber. The simulation results were taken as the thermal load for the heat transfer calculation of the EPDM insulation layer. The heat transfer process of the EPDM insulation layer was simulated by finite element software ANSYS. The experiment of heat transfer and ablation of the insulation layer in the afterburning chamber was carried out by stamping ground joint test. Heat transfer calculation results of heat insulation layer are in good agreement with the results of pipe joint experiment. The results of simulation calculation can give a certain degree of temperature rise trend on the back of heat insulation layer.