According to the characteristics of large number of sets and large size differences in the plain plate fin-and-tube oil cooler, a set of heat exchange units including a baffle is selected as the characteristic structure, and the heat transfer and pressure drop characteristics are numerically simulated and experimentally studied. The simulation results are compared with the experimental data to study the effects of changes in shell-side flow rate and plate-fin spacing on the heat transfer and pressure drop characteristics in the oil cooler. The results indicate that as the shell-side flow rate increases, both the heat transfer coefficient and pressure drop increase. When the shell-side flow rate is 1.6 m³/h, the heat transfer effect is the best; when the plate-fin spacing is 4 mm, the channel flow distribution is the most uniform, therefor the heat transfer effect is the best. The relationship curve between shell-side Nu number and Re number of the plain plate fin-and-tube oil cooler is obtained by fitting. It is used to explore the flow field and heat transfer characteristics inside the multi-layer small-spacing plain fin structure, which is instructive for optimizing its internal structure.

根据平板式翅片管式油冷却器的数量大，尺寸差异大的特点，选择包括挡板的一组换热单元作为特征结构，传热和压降特性为数值模拟和实验研究。将模拟结果与实验数据进行比较，以研究壳侧流速和板翅间距的变化对油冷却器中传热和压降特性的影响。结果表明，随着壳侧流速的增加，传热系数和压降均增加。壳侧流量为1.6 m ^3时/ h，传热效果最好；当翅片间距为4mm时，通道流分布最均匀，因此传热效果最好。通过拟合得到平板式翅片管式油冷器的壳侧Nu数与Re数之间的关系曲线。用于探索多层小间距平面翅片结构内部的流场和传热特性，对优化其内部结构具有指导意义。