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.是位于安大略省的私人温莎公司，为汽车，航空航天和国防行业提供先进的生产技术。中心线产生商业超音速冷喷雾系统，这是一个高速材料沉积过程，其中小的非熔融粉末颗粒（通常直径为10-50 µm）通常会在压缩气体的超音速射流中加速至200至1000 m/s的速度。在用目标表面撞击后，固体颗粒变形并键合在一起，迅速建立一层沉积的材料。 Centerline正在考虑将该技术扩展到增材制造的可能性。 增材制造是一个三维（3D）的打印过程，该过程构建层以从数字模型中创建实心对象。该过程是通过使用3D计算机辅助设计（CAD）来创建数字模型来实现的，该数字模型被切成非常薄的横截面称为层。在打印过程中，3D打印机会构建成功的材料层，直到对象完成为止。相比之下，传统的制造技术或减法制造涉及通过切割或钻孔系统地从散装形状中删除材料。与传统的制造方法相比，加性技术在许多应用中都具有优势。零件可以以任何几何复杂性形成。 Centerline现有的冷喷嘴提供约4.0毫米的斑点尺寸。要求将斑点尺寸降低到1.0毫米或更少，以获得更好的制造分辨率和生产复杂的物体。通过缩减当前的De Laval喷嘴设计，可以实现这一目标。考虑到商业化的潜力，中心线希望以数字评估类似于较小的喷嘴组件的模型的流体流量特性。将在温莎大学进行详细的计算流体动力学（CFD）研究，以评估收敛性发散喷嘴（de laval喷嘴）的性能。