纳米流体在内燃机冷却水腔中应用的基础问题研究

项目名称： 纳米流体在内燃机冷却水腔中应用的基础问题研究

项目编号： No.51276031

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 能源与动力工程

项目作者： 白敏丽

作者单位： 大连理工大学

项目金额： 98万元

中文摘要： 随着内燃机升功率的大幅提高，必然会产生更高的缸内温度，从而造成更多的热量传递给燃烧室部件，由此产生的内燃机冷却问题变得越来越突出，已成为制约内燃机高强化发展的一个瓶颈。鉴于纳米流体良好的传热性能，试图将其用于内燃机冷却水腔，以达到强化传热的目的。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，因此，可以通过改变这些因素，控制内燃机冷却水腔的传热量。课题拟通过纳米流体的分子动力学模拟，以及纳米流体流动的可视化与定量化实验研究，从微观和宏观两个层面上，揭示纳米流体强化传热的物理本质，进而建立纳米流体对流换热的数学物理模型，给出纳米流体两相流对流换热数值模拟的有效方法。并将有关纳米流体对流换热的基础研究结果，用于内燃机冷却水腔纳米流体强化传热研究，试图给出适于内燃机传热设计需要的纳米流体对流换热数学物理模型和数值模拟方法，为纳米流体在内燃机强化传热中的应用奠定理论基础。

中文关键词： 内燃机；冷却水套；纳米流体；强化传热；基础研究

英文摘要： The rapid increasing of engine specific power will inevitably generate higher combustion temperature, which results in more heat transferring to the combustion chamber components. And the resulting problem of cooling in internal combustion engines is more and more prominent which has become the bottle-neck of developing highly strengthened internal combustion engines. In view of the excellent heat transfer performance of nanofluids, the present work attempts to apply nanofluids in the cooling water jacket of engine in order to enhance heat transferring. Furthermore, as the heat transfer performance of nanofluids is influenced by several influencing factors including material, size, concentration, and shape of nanoparticles, the heat transfer quantity of the cooling water jacket could be controlled by changing these influencing factors. By means of molecular dynamics simulation on nanofluids combining with visualized and quantitative experiments on flow of nanofluids, the present subject intents to reveal the physical essence of heat transfer enhancement in nanofluids from the viewpoint of microcosmic and macrocosmic, therefore build the mathematical and physical model of convective heat transfer in nanofluids, and propose the effective method to carry out numerical simulation on convective heat transfer of two p

英文关键词： Internal Combustion Engine；Cooling Water Jacket；Nanofluids；Enhenced Heat Transfer；Basic Problem