Design of de Laval nozzle for additive manufacturing and 3D printing

用于增材制造和 3D 打印的德拉瓦尔喷嘴设计

• 批准号: 490444-2015
• 负责人: Balachandar, Ramaswami
• 金额: $ 1.82万
• 依托单位: University of Windsor
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=586484
• 关键词: Design; de; Laval; nozzle; additive

CenterLine Ltd. is a privately held Windsor, Ontario, based corporation, providing advanced production technologies to the automotive, aerospace and defence industries . CenterLine produces commercial supersonic Cold Spray Systems, which is a high-rate material deposition process in which small, non-melted powder particles (typically 10 - 50 µm in diameter) are normally accelerated to velocities between 200 to 1000 m/s in a supersonic jet of compressed gas. Upon impact with a target surface, the solid particles deform and bond together, rapidly building up a layer of deposited material. Centerline is considering the possibility of extending this technology to additive manufacturing. Additive manufacturing is a three-dimensional (3D) printing process that builds layers to create a solid object from a digital model. The process is achieved by using a 3D computer-aided design (CAD) to create a digital model that is sliced into very thin cross-sections called layers. During the print process, the 3D printer builds up successive layers of material until the object is finished. By contrast, the traditional manufacturing techniques or subtractive manufacturing involve the systematic removal of material from bulk shapes by cutting or drilling. Additive technologies offer advantages in many applications compared to the traditional manufacturing methods. Parts can be formed with any geometric complexity. CenterLine's existing cold spray nozzle offers a spot size of about 4.0 mm. It is required that the spot size be reduced to 1.0 mm or less for a better manufacturing resolution and for producing intricate objects. It may be possible to achieve this objective by scaling down the current de Laval nozzle design. Considering the potential for commercialization, CenterLine would like to evaluate numerically the fluid flow characteristics of a model that resembles a much smaller nozzle assembly. A detailed computational fluid dynamics (CFD) investigation, will be carried out at University of Windsor to assess the performance of the convergent-divergent nozzle (de Laval nozzle).

CenterLine Ltd. 是一家总部位于安大略省温莎的私营公司，为汽车、航空航天和国防工业提供先进的生产技术 CenterLine 生产商用超音速冷喷涂系统，这是一种高速材料沉积工艺，其中小型、非熔化的粉末颗粒（直径通常为 10 - 50 µm）通常在压缩气体超音速射流中加速到 200 至 1000 m/s 之间的速度。在撞击目标表面时，固体颗粒变形并粘合在一起，迅速形成一层沉积材料。Centerline 正在考虑将该技术扩展到增材制造的可能性。 增材制造是一种三维 (3D) 打印过程，通过构建层来从数字模型创建实体对象，该过程是通过使用 3D 计算机辅助设计 (CAD) 创建切片的数字模型来实现的。在打印过程中，3D 打印机会构建连续的材料层，直到物体完成，而传统的制造技术或减材制造则需要通过切割系统地从大块形状中去除材料。或钻孔添加剂与传统制造方法相比，该技术在许多应用中具有优势，可以形成任何几何复杂性的零件。 CenterLine 现有的冷喷涂喷嘴提供约 4.0 毫米的光斑尺寸，为了获得更好的制造分辨率并生产复杂的物体，需要将光斑尺寸减小到 1.0 毫米或更小。考虑到当前的拉瓦尔喷嘴设计的商业化潜力，CenterLine 希望对类似于更小的喷嘴组件的模型的流体流动特性进行数值评估，进行详细的计算流体动力学 (CFD) 研究。将在温莎大学进行，以评估收敛-扩散喷嘴（德拉瓦尔喷嘴）的性能。