Numerical Study on Flow-Heat Transfer of Oil-Immersed Transformer Based on Multiple-Scale and Multiple-Physical Fields
Zeng Feitong1, Guan Xiangyu2, Huang Yizheng3, Peng Hui3, Pan Rui1
1. China Electric Power Research Institute Wuhan 430074 China; 2. College of Electrical Engineering and Automation Fuzhou University Fuzhou 350180 China; 3. School of Electrical Engineering Wuhan University Wuhan 430072 China
Abstract In order to improve the performance of oil-immersed transformer and explore working characteristics of internal temperature field and flow field, a multi-physical field coupling method based on eddy-temperature-flow field is proposed and an internal fluid-heat transfer calculation model of oil-immersed transformer is established in this paper. Finite difference method (FDM) is used to calculate eddy current field in transformer. Lattice boltzmann method (LBM) is used to calculate temperature-flow field of transformer. On the macro, the method realized solid-liquid boundary heat transfer with the units of kelvin. On the mesoscopic, the method was used to calculate the temperature transfer and oil flow in solid domain and insulating oil fluid domain with the units of dimensionless LBM molecular distribution function. By this method, fluid-solid temperature coupled heat transfer based on macroscopic-mesoscopic unit scale variation was calculated, and the operating characteristics of temperature field and flow field in oil-immersed transformer were analyzed. This paper designed a transformer flow-heat transfer simulation experiment to verify the proposed model. It is shown that since the iteration of LBM algorithm requires the diffusion lattice density to cover the calculation area, the temperature rise is not obvious at the early calculation stage and cannot effectively fit the operating characteristics of the internal temperature field and flow field of the oil-immersed transformer. After a certain number of iterations, the calculation error is within 5% and can effectively fit the transformer operating characteristics. This algorithm model has some engineering significance to prevent the internal fault of oil-immersed transformer and reduce the internal overheating accident of oil-immersed transformer.
Zeng Feitong,Guan Xiangyu,Huang Yizheng等. Numerical Study on Flow-Heat Transfer of Oil-Immersed Transformer Based on Multiple-Scale and Multiple-Physical Fields[J]. Transactions of China Electrotechnical Society, 2020, 35(16): 3436-3444.
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2020, Vol. 35 
