Subjects: Dynamic and Electric Engineering >> Engineering Thermophysics submitted time 2017-11-07 Cooperative journals: 《工程热物理学报》
Abstract： Based on the Enthalpy-porosity model, an improved icing prediction model and numerical method are developed for the special freezing process of aircraft icing. The model and prediction method are validated by the related experiments. Compared with the traditional Enthalpy-porosity method, the results show that the new method can characterize the non-equilibrium freezing process of supercooled water droplet more effectively. Using the developed method, the influencing factors of the freezing characteristics of supercooled water droplet are analyzed, the temperature distribution and phase interface characteristics are obtained under different cooling conditions..The results can provide an important reference for the improvement of icing thermodynamic model and finer prediction of icing accretion.
Subjects: Dynamic and Electric Engineering >> Engineering Thermophysics submitted time 2017-03-22 Cooperative journals: 《工程热物理学报》
Abstract：为了进一步提高辐射传递因子的倒易性，本文提出了迭代双向统计蒙特卡罗方法。该方法将双向统计蒙特卡罗方法分解为归一化过程与双向统计过程，摆脱了传统迭代双向统计蒙特卡罗方法对等权抽样假设的依赖，进一步提高了辐射传递因子的倒易性。验证结果表明，迭代双向统计蒙特卡罗方法获得的辐射传递因子满足完整性，其倒易性误差的量级随双向统计迭代次数的增加而呈线性下降趋势。将该方法应用到含空腔结构的辐射/导热耦合边界平衡问题中，结果表明本文所建方法可以有效提高热辐射传输问题的求解精度，并且求解精度随着迭代次数的增加而提高。
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