本文描述同时由一个局部内热源和外部加热引起的封闭空腔内非稳态、二维、层流自然对流换热的数值分析结果,研究了外部雷利数、局部内热源相对强度、位置及尺寸大小的影响。给出了速度场和温度分布,得到了热壁和冷壁的平均和局部努谢尔特数及平均努谢尔特数随时间的变化。 This paper describes the numerical analysis of unsteady, two-dimensional, laminar and natural convective heat transfer in a closed cavity caused by both a local internal heat source and an external heat source. The effects of the external Reilly number, the relative intensities of local internal heat sources, Size effect. The velocity field and temperature distribution are given, and the mean and local Nussuret numbers and mean Nursert numbers of hot and cold wall are obtained with time.