Analysis of heat transfer and thermal ablation of honeycomb sandwich composite structure under laser irradiation
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摘要: 结合蜂窝结构传热机制与复合材料烧蚀机制，研究了蜂窝夹芯复合材料结构在激光辐照条件下的热响应。针对典型蜂窝单元，建立了细观导热及烧蚀理论模型。基于有限元软件热分析模块和二次开发程序构建了蜂窝夹芯结构的高温传热数值模型，考虑了热物性参数的非线性变化、树脂热解和纤维烧蚀过程。采用连续激光作为加载热源，设计并开展了大气环境中蜂窝结构的热烧蚀实验，获得了蜂窝结构的动态烧蚀特征。结果表明，蜂窝夹芯复合材料结构在激光功率密度为102 W/cm2量级时具有良好的抗烧蚀能力，数值模型能够较为准确地模拟激光加载蜂窝结构过程中的烧蚀温度和树脂、纤维的烧蚀情况，并获得较为真实的烧蚀形貌。Abstract: Combined with the heat transfer mechanism of honeycomb structure and the ablation mechanism of composites, the thermal response of honeycomb sandwich composite structure under laser irradiation was studied. For typical honeycomb cells, a theoretical microstructure model of thermal conduction and ablation is established. Based on the finite element software thermal analysis module and secondary development program, a high temperature heat transfer numerical model of honeycomb sandwich structure was constructed, taking into account the nonlinear changes of thermal physical parameters, resin pyrolysis and fiber ablation process. Using continuous laser as the loading heat source, the thermal ablation experiments of honeycomb structure in atmospheric environment were designed and carried out, and the dynamic ablation characteristics of honeycomb structure were obtained. The results show that the honeycomb sandwich composite structure has good ablation resistance when the laser power density is 102 W/cm2; The numerical model can accurately simulate the temperature field and the ablation of resin and fiber in the process of laser loading the honeycomb structure, and can obtain comparatively real ablation morphology.
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Key words:
- composites /
- honeycomb /
- laser /
- ablation /
- heat transfer
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图 4 不同时刻蜂窝结构辐照表面温度场变化
Figure 4. Temperature field variation of the irradiated surface of honeycomb structure at different time
图 5 蜂窝夹芯复合材料结构数值建模示意图
Figure 5. Schematic diagram of numerical modeling of honeycomb sandwich composite structure
图 6 不同时刻辐照表面数值模拟温度场变化
Figure 6. Temperature field variation of irradiated surface of numerical simulation model at different time
图 7 蜂窝结构辐照表面最高温度-时间曲线
Figure 7. Maximum temperature-time curves of honeycomb structure’s irradiated surface
图 9 不同时刻蜂窝结构中树脂热解区域变化
Figure 9. Variation of resin pyrolysis region in honeycomb structure at different time
图 10 蜂窝结构前后面板外表面最高温度-时间曲线
Figure 10. Maximum temperature-time curve of front and rear panel outer surface of honeycomb structure
表 1 CFRP各组分热物性参数
Table 1. Thermophysical parameters of CFRP components
parameter value thermal conductivity of fiber/(W·m−1·K−1) 30 density of fiber/(kg·m−3) 1760 specific heat capacity of fiber/(J·kg−1·K−1) 956 thermal conductivity of resin/(W·m−1·K−1) 0.5 density of resin/(kg·m−3) 1200 specific heat capacity of resin/(J·kg−1·K−1) 1690 thermal conductivity of char/(W·m−1·K−1) 5 density of char/(kg·m−3) 1300 specific heat capacity of char/(J·kg−1·K−1) 1589 thermal conductivity of gas (CO2) /(W·m−1·K−1) 0.025 density of gas (CO2) /(kg·m−3) 1.997 heat capacity at constant pressure for gas (CO2) /(J·kg−1·K−1) 720 
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