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对大高宽比坚环形封闭空腔内自然对流换热问题进行了数值研究．考虑竖环形空腔内自然对流是符合Ｂｏｕｓｓｉｎｅｓｑ假定的层流、稳态的二维轴对称流动，在适当Ｒａｖｌｅｉｇｈ数变化范围内，用涡量一流函数方程对该问题进行了数值模拟，得到了２≤Ｋ≤１０和Ａ＝２４的几何参数下竖环形封闭空腔在内管表面为等热流、外壁恒壁温情形的流动模式和换热规律，并讨论了数值计算结果与实验结果之间的一致和差异．
The numerical simulation of natural convection heat transfer in a large closed-ring cavity with large aspect ratio is carried out. Considering the natural convection in the vertical annular cavity, which is in agreement with Boussinesq’s assumption of laminar flow and steady-state two-dimensional axisymmetric flow, this problem is numerically simulated by the first-order function of vorticity within the range of the appropriate Ravleigh number. ≤K≤10 and A = 24, the flow pattern and heat transfer rule of the vertical ring-shaped closed cavity on the inner tube surface are isothermal flow and outer wall constant temperature, and the relationship between numerical calculation and experimental results is discussed Consistent and differentiated.