【摘要】 建立碳素复合材料电热元件的辐射热流密度分布模型,利用MATLAB软件进行数值计算和可视化分析。结果表明,元件辐射热流密度随碳素复合材料发射率增大而增大,热流密度的不均匀度提高。元件辐射热流密度随石英发射率的增加而增大,热流密度不均匀度随之提高。随石英外半径增加,元件辐射热流密度先有所提高,在设定初始条件下,当外径>0.45cm,热流密度又迅速减小,热流密度不均匀度随石英外半径的增加最初增加,之后变化不大。试验验证,测试数据与模拟计算结果基本一致,为碳素复合材料电热元件的结构改进以及红外辐射场优化设计提供了依据。更多还原

【Abstract】 The mathematical models of radiative heat flux density distribution for single carbon composite heating element was established,the numerical calculation and visual analysis of which were carried out by software of MATLAB.The results show that the radiative heat flux density of single element increased with the increase of emissivity of carbon composite,the non-uniformity of heat flux density also increased.The radiative heat flux density of single element increased with the increase of emissivity of quartz,also the non-uniformity of heat flux density also increased.With the increase of outside radius of quartz,the radiative heat flux density of single element firstly increased,under the setting initial condition,the heat flux density decreased rapidly when the outside radius of quartz tube was equal to 0.45cm,the non-uniformity of heat flux density slowly increased with the increase of outside radius of quartz firstly,and then had little change.The experiment results show that model test data is approximately accordance with simulating result,which supplies a reference to the improvement of carbon matrix composites electric heaters’ structure and the optimization designs of infrared radiative field in the future.更多还原