温度均匀性对V形槽面黑体辐射特性的影响

Impact of temperature nonuniformity on radiant characteristics of V-grooved surface blackbody

摘要:

为了解决同心圆V形槽结构面源黑体的温度不均匀性产生原因及其对辐射特性的影响等问题,提出了基于蒙特卡洛全光路跟踪的辐射特性评估方法． 首先通过与精密方法的相互比对验证了该方法的正确性及准确程度,而后分析了温度不均匀性的产生原因及变化规律,最后对温度均匀性与辐射特性之间的影响关系进行了研究． 结果表明,槽夹角越小、槽深度越深、工作温度与环境温度差异越大,温度均匀性越差；槽夹角和槽深度还会直接或间接的对有效发射率产生影响． 作为结论,建议采用45°或60°槽夹角,槽深度不宜超过2 mm,建议附加热管技术以及保护套筒结构．

Abstract:

To understand the generation of temperature nonuniformity and its influence on effective emissivity, a radiant characteristics calculation method based on Monte Carlo(MC) full ray tracing technique for V-grooved surface blackbody is proposed. The exactitude of this method is approved by comparison with precise Bedford method, then the reason and development of temperature nonuniformity are discussed, and finally the effects of temperature nonuniformity on effective emissivity are disclosured. The results demonstrate that the temperature uniformity is deteriorated when small grooved angle, high grooved length and big temperature difference between surface temperature and environment are adopted. Further more, the grooved angle and length can exert influences on effective emissivity. It is concluded that the grooved angle of 45° of 60° and the grooved depth less than 2 mm can give a satisfied effective emissivity and temperature uniformity to general application. Better performance can be achieved when heat pipe technique and guarded sleeve are applied.