内燃机冷却系统中应用纳米流体强化传热研究综述

内燃机工作时依赖冷却系统将多余热量及时带走以保证燃烧室核心部件及润滑油膜的正常工作温度。常规内燃机冷却介质导热系数偏低,而新一代强化传热工质纳米流体具有明显提升的传热性能,应用于内燃机冷却系统有利于强化内燃机传热及提高热管理性能。且由于纳米流体的传热性能受纳米粒子的种类、大小、浓度、形状等因素影响,可以通过改变这些因素控制内燃机冷却水腔的传热量。综述了国内外研究者针对纳米流体导热系数与对流换热性能开展的试验测试、理论分析和计算机模拟研究工作,以及纳米流体应用于内燃机冷却系统中强化传热的进展,最后指出当前研究工作的不足及未来工作方向。

Review of Research on the Application of Nanofluids-Enhanced Heat Transfer in Cooling System of Internal Combustion Engine

Internal combustion engine relies on its cooling system to take away the excess heat and control the normal operating temperature of the core components of the combustion chamber and the lubricating oil film, wherein the heat transfer performance of the conventional cooling medium is generally low. The new generation of enhanced heat transfer working medium - nanofluids has good heat transfer performance, which is ideal to applying to the cooling system of internal combustion engine to enhance heat dissipation and improve thermal management performance. Moreover, because the heat transfer performance of the nanofluids is affected by factors such as the type, size, concentration, and shape of the nanoparticles, the heat transfer amount of the cooling water chamber of the internal combustion engine can be controlled by changing these factors. This paper reviews the experimental, theoretical and computer simulation studies conducted by researchers on the thermal conductivity and convective heat transfer performance of nanofluids, as well as the application of nanofluids in enhancing heat transfer of internal combustion engine. Finally, it points out the shortcomings of the current research work and the future work directions.