Analysis of Two-phase flows for Spraying Processes

喷涂过程的两相流分析

• 批准号: RGPIN-2015-06092
• 负责人: Dolatabadi, Ali
• 金额: $ 2.48万
• 依托单位: Concordia University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=685171
• 关键词: Analysis; Two; phase; flows; Spraying

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. In a conventional thermal spray system such as plasma, high velocity oxygen fuel (HVOF), or cold spray, coating particles with a size of tens of microns are fed into the spray nozzle where they are heated and accelerated to high velocities. Consequently, thermally sprayed coatings are formed by the impact and solidification of a stream of molten or semi-molten particles on a surface. We 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 the proposed study, we would like to further expand the capabilities of thermal spray processes by facilitating the injection and deposition of nano and submicron sized 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 a combined computational and experimental study. Suspension injection will be modelled and characterized to address the need of industries for spraying nanopowders at moderate cost. We expect that the results of this study will facilitate manufacturing of key aerospace components, and have a great impact on the Quebec aerospace industry. The technology will also find many applications in the automotive, power generation, and biomedical industries, all of which are important to the Canadian economy.***Furthermore, a computer code which can simulate the process of atomization in industrial sprays has broad applications in the design of nozzles for delivering fuel in engines, burners, and boilers, as well as for agricultural sprays, dryers, inhaled drug delivery systems, etc.**

热喷涂广泛应用于航空航天、汽车、发电和生物医学行业，为暴露于高温、腐蚀和磨损的起落架、发动机、涡轮机和植入部件提供保护涂层。在等离子、高速氧燃料 (HVOF) 或冷喷涂等传统热喷涂系统中，数十微米大小的涂层颗粒被送入喷嘴，在喷嘴中被加热并加速至高速。因此，热喷涂涂层是通过熔融或半熔融颗粒流在表面上的冲击和固化而形成的。我们设计并制造了一种护罩附件，它大大扩展了 HVOF 工艺在沉积效率和灵活性方面的能力，以允许使用陶瓷粉末进行涂层（美国专利号 6,845,929）。 ***在拟议的研究中，我们希望通过使用悬浮液原料促进纳米和亚微米尺寸涂层颗粒的注入和沉积，进一步扩展热喷涂工艺的能力。为此，我们需要对所有速度气流状态下的雾化和液体破碎有透彻的了解。拟议的工作将通过计算和实验相结合的研究来满足这一需求。将对悬浮液注射进行建模和表征，以满足工业以中等成本喷涂纳米粉末的需求。我们预计这项研究结果将促进关键航空航天部件的制造，并对魁北克航空航天业产生重大影响。该技术还将在汽车、发电和生物医学行业中得到广泛应用，所有这些对加拿大经济都很重要。***此外，可以模拟工业喷雾雾化过程的计算机代码在以下领域具有广泛的应用：用于在发动机、燃烧器和锅炉中输送燃料以及用于农用喷雾剂、干燥器、吸入药物输送系统等的喷嘴设计**