采用CFD的方法建立了平直翅片数值模型,将数值计算所得结果和相关文献中的实验数据进行了对比,验证计算模型具有一定的准确性.提出了翅片内部加装交叉扰流柱和扰流片的新型结构,交叉结构能够增强流体内部的扰动,强化流体内部的热量传递,并周期性的阻碍边界层的稳定生成,流体中心区域的温度明显上升,换热效果得到了明显加强.与平直翅片相比,新结构翅片具有较高的 j因子和 f 因子,但同时也产生了较高的压降.根据实验数据拟合得到 j因子和 f 因子与雷诺数Re之间的关系式,该关系式在低雷诺数范围内对新结构的传热性能预测具有一定的准确性.%In this paper,the CFD method is used to establish the numerical model of plain fins,and the calculated results are compared with the relevant experimental data to verify the accuracy of the model.A new structure of cross-spoiler and cross-pins was presented.The new structure enhances the disturbance of the fluid in the flow channel and periodically hin-ders the development of the boundary layer,so that the temperature in the center of the fluid increases obviously,the heat transfer was enhanced.Compared with plain fins,the new struc-tural fins have higher j-factor and f-factor,but also higher pressure drop.T he relationship between the j,f factor and reynolds number is obtained by fitting the experimental data.The correlation has a certain accuracy in predicting the heat transfer performance of the new structure in the low Reynolds number range.
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