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为了研究壁面温度和来流速度对边界层特性的影响,采用计算流体动力学(computational fluid dynamics,CFD)软件对空气流过竖直加热平板的对流边界层特性进行数值模拟.采用k-ε模型和SIMPLE算法分别对不同壁面温度的自然对流和不同来流速度的混合对流进行模拟计算,得到温度分布和速度分布,通过分析结果表明:高温对边界层特性的影响很小,而随着空气来流速度的增大,速度边界层和热边界层的厚度减小,最大速度增大.
In order to study the effect of wall temperature and inflow velocity on the boundary layer properties, computational fluid dynamics (CFD) software was used to simulate the convective boundary layer characteristics of air passing through a vertically heated plate. The k-ε model SIMPLE algorithm was used to simulate the natural convection of different wall temperatures and the mixed convection of different flow velocities respectively. The temperature distribution and velocity distribution were obtained. The results show that the influence of high temperature on the properties of the boundary layer is small, When the velocity of flow increases, the velocity boundary layer and the thermal boundary layer decrease in thickness and the maximum velocity increases.