非传导和传导混合边界下湍流对流传热机理研究

对流现象广泛存在的自然界，实际工程许多热源被绝缘材料隔开形成非传导和传导混合边界。然而，目前对不同非传导和传导混合边界下湍流对流传热机理研究仍然所知有限，本项目针对不同非传导和传导混合边界下湍流传热特性，拟开展理论分析、数值计算和实验验证基础研究。开展不同非传导和传导混合边界下湍流传流中不同羽流之间时空演化特征研究；开展不同无量纲热长度 ξ 非传导和传导混合边界下湍流传流中速度和温度的小尺度统计，揭示不同离散无量纲热长度下湍流传流系统中速度、温度和传热的Lagrangian统计特性；建立非传导和传导混合边界下不同无量纲热长度 ξ 的Nu-Ra之间标度律关联，从而揭示不同非传导和传导混合边界下湍流对流中换热强度的变化规律。争取在基础层次都取得出色的系列成果，为解决其他湍流RB对流热有关的类似难题作科学基础储备。

In the nature of the convective phenomenon, many heat sources are separated from the insulating material to form the mixed boundary of non conduction and conduction. However, the current research on the heat transfer mechanism of turbulent thermal convection conduction and non conduction of different mixed boundary is known.To study the heat transfer characteristics of different turbulent non conduction and conduction mixed boundary conditions, numerical calculation, experimental verification, and the theoretical analysis will be implemented . Different non conduction and conduction mixed boundary conditions between different plume turbulence flow in the spatio temporal evolution characteristics are carried out. About different dimensionless length, small scale thermal statistics of velocity and temperature of turbulent flow in the conduction and conduction mixed boundary are studied. It is revealed the statistical properties of different discrete velocity, temperature and turbulent flow heat transfer system dimensional heat in length. It is established between non conduction and conduction mixed boundary conditions of different dimensionless thermal length of Nu-Ra scaling law association, so as to reveal the variation of heat transfer intensity of different non turbulent convection conduction and conduction in mixed boundary. In order to make a scientific base for solving the similar problems related to the other turbulent RB convection heat, we should strive for a good series of results at the basic level.