为了对机械设备用油进行降温，保障机械设备正常工作。本文对油冷却器的结构进行了优化，根据工质油粘度大、Pr数大的特点，选择多叶孔板结构实现壳程的传热强化。采用商用软件FLUENT对三叶孔板、四叶孔板以及五叶孔板换热器进行数值模拟，得到了油冷器的壳程传热与阻力性能曲线。结果表明：多叶孔支撑板对高粘度流体油的传热有强化作用。三叶孔、四叶孔与五叶孔支撑板之间进行比较，在流体流速较低时，采用正四边形布管的四叶孔与五叶孔支撑板综合性能更好一些，但在其他大部分工况下，三叶孔板换热器的传热强化综合性能更优，其无量纲传热强化综合指标PEC比四叶孔与五叶孔分别提高37%~62%和39%~63%。

In order to reduce the temperature of oil and ensure the normal operation of machinery and equipment,this study has optimized the structure of the oil cooler.According to the characteristics of the viscosity and the large Pr number of the working oil,the multi leaf baffle structure is selected to achieve heat transfer enhancement of the shell side.The commercial software FLUENT was used to numerically simulate the Trefoil-hole baffle,Quadrifoil-hole baffle,and Quinquefoil-hole baffle heat exchangers.The heat transfer and resistance performance curves of the oil cooler were obtained.The results show that the multi-leaf baffle structure has a strengthening effect on the heat transfer of high viscosity fluid oil.Comparing the Trefoil-hole,Quadrifoil-hole,and Quinquefoil-hole baffle heat exchangers,the Quadrifoil-hole and Quinquefoil-hole baffle structures with a quadrilateral arrangement have better overall performance at lower fluid velocities.However,at most other conditions,the heat transfer enhancement performance of the Trefoil-hole baffle heat exchanger is better,and its PEC is increased by 37% to 62% compared with the Quadrifoil-hole structure,and 39% to 63% compared with the Quinquefoil-hole structure .

TK124

国家自然科学基金(51376069，51736004)