纳米流体对内燃机冷却系统强化传热的数值模拟研究

Numerical Simulation of Enhanced Heat Transfer of Engine Cooling System by Nanofluids

将Cu-水纳米流体应用到内燃机冷却系统中,并利用大型通用CFD软件STAR-CD针对不同浓度纳米流体的内燃机冷却系统进行三维数值模拟计算。通过计算可以得到传热工质的流场、压力场及壁面换热系数的空间分布。结果表明,以Cu-水纳米流体作为传热工质可以显著提高内燃机的散热性能,且散热量随着纳米粒子浓度的增大而增大。同时,纳米粒子的加入也引起了内燃机冷却系统泵功的增加,但是与散热量的显著提高相比是可以接受的。

Cu-water nanofluids was applied in the cooling system of the combustion engine and the com- mercial CFD software STAR-CD was employed to perform the 3-D numerical simulation of the cooling system of engine with different concentration of nanofluids. The flow field, the pressure field and the surface heat transfer coefficient distribution were obtained by the simulation. The results indicate that nanofluids can evidently enhance the engine heat transfer capability, and the enhancement becomes increasing while increasing the concentration of nano-particles. The engine pump work of cooling system will also increase. It is acceptable since a remarkable enhancement on heat transfer is realized.