射流条件下采用纳米流冷却液对柴油机缸盖冷却的研究

为提高柴油机缸盖的散热性能,提出一种将纳米流冷却液作为冷却工质,利用射流技术提高缸盖进排气门鼻梁处传热系数的方法。试验研究发现,相同射流参数下,不同体积分数的纳米流冷却液较传统冷却液都可有效提升传热系数,但体积分数增加的作用有限。同体积分数的纳米流冷却液会因为不同射流参数而表现出不同的传热性能,同时也会因为其本身黏性的增加而耗费更大的驱动功率。采用纳米流冷却液可以有效提高缸盖鼻梁处的传热系数。

A Study of Diesel Cylinder Head Cooling Using Nano-flow Coolant with Jet-flow Method

To improve the thermal performance of a diesel engine cylinder head, this paper presented a method that multi-metal nano-flow coolant as a new cooling fluid, using jet flow technology to improve heat transfer coefficient at the cylinder head intake and exhaust valves nose. After tests,it is found that, with the same jet flow parameters, the different volume share multi-metal nano flow has more heat transfer coefficient than that of traditional coolant, but the effects of the volume fraction increase are limited. The same volume share multi-metal nano flow shows different heat transfer performance because the impact of different jet angles and jet distances.At the same time, its own viscosity increases will cause more drive power cost. Heat transfer coefficient of multi-nano-flow is better than that of traditional coolant in cylinder head nose.