| 肖杰,邓晰文,谢光义,等.活塞内冷油腔中纳米流体振荡流动与传热特性影响因素研究[J].内燃机工程,2022,43(3):1-10. |
| 活塞内冷油腔中纳米流体振荡流动与传热特性影响因素研究 |
| Research on the Influencing Factors of the Oscillation Flow and Heat Transfer Characteristics of Nanofluids in Cooling Gallery of Piston |
| DOI：10.13949/j.cnki.nrjgc.2022.03.001 |
| 关键词:活塞 内冷油腔 纳米流体 振荡传热 传热系数 |
| Key Words:piston cooling gallery nanofluid oscillating heat transfer heattransfer coefficient |
| 基金项目:国家自然科学基金重点项目（51805233） |
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| 摘要点击次数: 1257 |
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| 摘要:采用计算流体力学的方法，研究了分别含Al2O3、CuO、SiO2的3种纳米机油在纳米颗粒体积分数为1%、3%、5%时相对于传统机油的振荡传热能力和机油在油腔内流动的规律。结果表明，纳米颗粒的加入改变了流体的物性参数，纳米流体的传热效果比传统机油更好，且内冷油腔的传热系数随着纳米流体体积分数的增加而增加，但对内冷油腔内瞬态机油的瞬态分布和充油率的影响不大；纳米流体的黏度、密度、导热系数、比热容都能影响内冷油腔的传热性能，密度的增加会使流体对壁面的冲击作用更强，从而增强油腔的传热能力；在纳米颗粒体积分数为5%时CuO纳米机油的传热系数比Al2O3、SiO2纳米机油分别高8.2%和14.6%。 |
| Abstract:Using the method of computational fluid dynamics， the oscillating heat transfer ability of three nano-oils containing Al2O3， CuO， and SiO2 at the volume fractions of 1%， 3%， and 5% relative to the traditional engine oil and the oil flow law in the cooling gallery were studied. Results showed that the addition of nanoparticles changed the physical parameters of the fluid. Compared with traditional engine oils， nanofluids had better heat transfer effects. With the increase of the volume fraction of nanofluids， the heat transfer coefficient of the cooling gallery increased， while the transient distribution of the transient oil in the cooling gallery and the oil filling rate were ravely influenced. The viscosity， density， thermal conductivity and specific heat capacity of the nanofluid could affect the heat transfer performance of the cooling gallery. The increase of density would make the impact of the fluid on the wall stronger， thereby enhancing the heat exchange capacity of the cooling gallery. When the volume fraction was 5%， the heat transfer coefficient of CuO nano engine oil was 8.2% and 14.6% higher than that of Al2O3 and SiO2 nano engine oil， respectively. |
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