초록

Numerical calculations of turbulent natural convection in an enclosure of the 20 kYA oil-immersed transformer model are presented. The transformer is modelled as two concentric cylinders with different heights and diameters. The thermal boundary layers are well represented in the temperature distributions along the wall of the transformer model. The flow stratification between the hot and cold walls can not be seen in the transformer model. The turbulence eddy viscosity has its maximum at the center of the core and its maximum values at the top of the core are larger than those at the bottom of the core.

키워드

• 변압기 모델;
• 난류자연대류;
• 수치해석;
• 저레이놀즈형$k-\varepsilon$ 모델

• Transformer model;
• Turbulent natural convection;
• Numerical analysis;
• Low-Reynolds number$k-\varepsilon$model;