复杂物理场中氧化石墨烯颗粒对液体着火与火焰传播的影响机理研究

氧化石墨烯以其清洁、高效、易制备的综合优势，被认为是理想的燃料添加剂。然而，与流体燃料相比，氧化石墨烯为固态，存在结构和含氧量方面的差异，参与燃烧时改变燃料传热与传质过程，使纳米流体燃烧更为复杂。目前，添加氧化石墨烯颗粒的液体燃料在复杂物理中的雾化、着火及火焰传播机理尚未清晰。因此，本项目拟以氧化石墨烯纳米流体为研究对象，开展氧化石墨颗粒着火特性研究，探索不同条件下颗粒氧化放热规律；进而，深化氧化石墨烯着火对燃料蒸发雾化的影响研究，重点分析颗粒油膜“微爆炸”及其二次雾化特性。最后，采用实验与模拟仿真相结合方法，开展高温环境下纳米流体的相变、混合、传热和传质过程的研究，从机理上揭示纳米流体着火和火焰传播过程。此外，开展发动机的燃烧与排放特性研究，探索石墨烯纳米流体燃料高效清洁燃烧的技术路径。本项目研究为纳米流体的蒸发和燃烧提供新的理论，为石墨烯纳米颗粒在内燃机的应用提供学术理论与工程。

Graphene Oxide (GO) is considered to be a potential fuel additive due to its comprehensive advantages of being clean, efficiency and easy-preparation. Compared to fluid fuels, however, GO is a solid phase with differences of structural and oxygen content, leading to a changed process of heat and mass transfer during combustion, thereby, nanofluid combustion is more complex than regular combustion. To the best of the author’s knowledge, the atomization, ignition and flame propagation mechanisms of nanofluid in complex physics are still unclear. Therefore, the project intends to take GO nanofluids as the research object, carry out research on the ignition characteristics of GO particles, and explore the laws of particle oxidation and heat release under different conditions. Furthermore, the influence of GO ignition on fuel vaporization and atomization is further studied, with emphasis on the analysis of "micro-explosion" of oil-film particles and its secondary atomization characteristics. Finally, the phase change, mixing, heat transfer and mass transfer of nanofluids in high temperature environment would be studied by combining experiment and simulation, and the ignition and flame propagation processes of nanofluids are revealed from the mechanism. In addition, the combustion and emission characteristics of the engine would be studied, and the technical path of efficient and clean combustion of GO nanofluids is explored. This project provides new theories for the evaporation and combustion of nanofluids and provides academic theories and engineering for the application of GO nanoparticles in internal combustion engines.