电热油汀散热效果的仿真研究与优化

Simulation Research and Optimization on Heat Dissipation Effect of Oil-filled Radiator

针对电热油汀升温速度慢、热舒适性差问题,采用Fluent数值模拟方法对电热油汀散热片内部导热油的流动和传热特性进行研究。研究内容为油路结构优化提供了理论基础,结果可用于提高散热片表面温度均匀性和油汀整体散热效果。通过与实验参数对比,修正仿真计算模型,仿真误差降至12%。对三款油路结构散热片模拟计算,分析油道宽度、数量对散热片温度分布的影响。研究结果表明:对有横向油路的散热片,减小上部油路宽度后,由于阻力原因引起散热片下部油路循环油量增加,利用散热片外侧空气上热下冷的特点可强化对流换热,减小散热片表面温度不均匀性;两条油道散热片导热油流动与传热特性不对称分布,散热片相同高度两侧棱边最大温度差值达16.5℃,表面温度均匀性不及三条油道散热片。

Aiming at solving the problems of slow heating speed and poor thermal comfort of oilfilled radiator,the Fluent numerical simulation method was undertaken to study the flow and heat transfer characteristics of the oil inside the radiator.The research provided a theoretical basis for the optimization of oil flow channel structure,and the results could be used to improve surface temperature uniformity and enhance the overall heating effect.The calculation model was corrected by experimental parameters,and the simulation error was less than 12%.Three dissipation sheets of the oil-filled radiator with different flow channels strcture were simulated to analyze the influence of oil channel’s width and number on temperature distribution.The results indicate that,for the sheets with transverse oil channel,the amount of oil circulating in the lower oil channels was increased caused by resistance through reducing the width of the upper oil channels,and the surface temperature uniformity and heat transfer between the sheet and air were improved due to the better cooling conditions of low oil channels.The oil flow and heat transfer characteristics of heat dissipation sheet with two upper oil channels were asymmetrical,and the maximum temperature difference between two sides of the heat dissipation sheet with the same height is 16.5℃.The surface temperature uniformity of sheet with two upper oil channels was less than that with the three upper oil channels.