Analysis of two-phase flows for spraying processes

热喷涂广泛用于航空航天、汽车、发电和生物医学行业，为暴露在热、腐蚀和磨损中的起落架、发动机、涡轮机和植入部件提供保护涂层。高速氧气燃料(HVOF)已被证明是制备高性能涂层的最有效的技术之一。我设计和制造了护罩附件，它在沉积效率和灵活性方面大大扩展了HVOF工艺的能力，允许使用陶瓷粉末涂层(美国专利号6845929)。在这项工作中，我们希望通过使用悬浮原料促进纳米涂层颗粒的注入和沉积来进一步扩大该工艺的能力。为此，我们需要对所有速度的气体流动状态下的雾化和液体破碎有一个透彻的了解。拟议的工作将通过计算和实验研究来满足这一需求。将对轴向和径向悬浮注射进行建模和表征，以满足工业对以适中成本喷洒纳米粉末的需求

Thermal sprays are extensively used in the aerospace, automotive, power generation, and biomedical industries to provide protective coatings on landing gear, engine, turbine, and implant components that are exposed to heat, corrosion, and wear. High Velocity Oxygen Fuel (HVOF) has been demonstrated to be one of the most efficient techniques to deposit high performance coatings. I have designed and built a shroud attachment which considerably expands the capabilities of the HVOF process in the areas of deposition efficiency and flexibility to allow coating with ceramic powders (U.S. Patent No. 6,845,929). In this work, we would like to further expand the capabilities of the process by facilitating the injection and deposition of nanosized coating particles using a suspension feedstock. For this purpose, we need to have a thorough understanding of the atomization and liquid fragmentation in all speed gas flow regimes. The proposed work will address this need through computational and experimental studies. Axial and radial suspension injections will be modeled and characterized to address the need of industries for spraying nanopowders at moderate cost