接触热阻对纤维隔热毡传热行为的影响研究(英文)

• 作 者: 赵淑媛 张博明 杜善义
• 机 构: 哈尔滨工业大学复合材料与结构研究所,
• 出 处: Chinese Journal of Aeronautics
• 发表日期: 2009年05期
• 关键词: 平均绝对偏差 蒙特卡洛 辐射性质 传热模型 有效热导率 fibrous 热响应 extinction 热导率 insulation

本文建立了辐射与传导相耦合的数值传热模型来预报热防护系统用纤维隔热材料的传热行为。利用实验测得的瞬态温度数据(热面最高达1000K),采用蒙特卡洛方法确定了修正后的辐射性质。最后将瞬态热响应的计算结果与实验结果进行了比较。结果表明:接触热阻的存在会显著影响试件的温度分布,对传热模型中忽略接触热阻的情况其平均绝对偏差为3.25%,而对无接触热阻存在的情况平均绝对偏差只有1.82%。

In this paper, a numerical heat transfer model coupled with radiation and conduction is established to predict the heat transfer behavior of fiber insulation for thermal protection systems. Using the measured transient temperature data (up to 1000 K hot surface), the modified radiation properties were determined using the Monte Carlo method. Finally, the transient thermal response is compared with the experimental results. The results show that the existence of contact resistance significantly affects the temperature distribution of the specimen, the average absolute deviation is 3.25% when the contact resistance is ignored in the heat transfer model, and the average absolute deviation of the contact resistance is only 1.82 %.