变压器用片式散热器传热结构改进的数值分析

片式散热器具有成本低、结构简单、散热效率高等优点,是保障变压器正常生产、调节工艺介质温度的关键设备,其换热性能直接影响变压器内部绕组等金属器件的使用寿命。为提高片式散热器换热性能,达到节能环保、降低能耗的目的,在模型Y方向两侧安装散热板,并在散热板上设置不同直径的穿孔,通过数值模拟的方法研究穿孔直径对散热板的辐射换热、对流换热和综合换热性能的影响。结果表明：安装散热板后,散热器的总散热量提高了3.9%,出口0.3 m处油温降低了6.91 K;安装孔径为18 mm的散热板后,两侧散热板的综合传热性能分别提高了25.46%和28.76%。可见18 mm穿孔散热板为最佳选择,该研究为片式散热器的设计和改进提供了新的经验认知。

Numerical Analysis of Improvement of Heat Transfer Structure of Panel-Type Radiator for Transformer

Panel-type radiator has the advantages of low cost, simple structure and high heat dissipation efficiency. It is a key equipment to ensure the normal production of transformers and adjust the temperature of the process medium. In order to improve the heat transfer performance of the plate radiator, achieve the purpose of energy saving, environmental protection, and reduce energy consumption, heat plates are installed on both sides of the model in the Y direction, and perforations of different diameters are set on heat plates, the effect of the perforation diameter on the radiation heat transfer, convection heat transfer and comprehensive heat transfer performance of the heat plates is studied by numerical simulation. The results show that with the heat plates installed, the total heat dissipation of the radiator is increased by 3.9%, and the oil temperature at the outlet 0.3 m is reduced by 6.91 K; the comprehensive heat transfer performance of the heat plates on both sides with an aperture of 18 mm, is increased by 25.46% and 28.76% respectively, and the 18 mm perforated heat plate is the best choice. A new empirical understanding is provided for the improvement and design of the external structure of panel-type radiator.