Purpose

The purpose of this paper is to demonstrate the aerodynamic behavior of a supersonic combustion test bench (SCTB) components, as the transition piece and the combustor of a scramjet (supersonic combustion ramjet), manufactured by 3D printing or additive manufacturing (AM).

Design/methodology/approach

For the dimensional and structural analysis of the manufactured models, a portable 3D scanner was used to generate the mesh of its dimensions, and to compare them before and after the experiments, a roughness measuring system was also used to verify the roughness inside the models before and after the tests, as roughness is an important parameter because it directly affects the boundary layer. For the visualization of the flow, the non-intrusive schlieren optical technique was used.

Findings

The experiments were carried out on the SCBT for Mach 2 flows, using the manufactured prototypes and showed that there was no structural and dimensional change of the model after the test batteries. It was found that the roughness presented by the material did not affect the quality of the flow generated. This shows that the investigated material can also be applied in experiments with supersonic flow.

Originality/value

This paper presents that it is possible to use in ground test facilities, for the studies of supersonic flow (in cold condition), pieces and models manufactured by 3D printing without affecting the quality of the flow generated during the experiments. This study presents a new perspective to approach AM applied in the studies of supersonic flows.

中文翻译：

---

增材制造在超音速流动研究中的应用案例研究

目的

本文的目的是展示超音速燃烧试验台 (SCTB) 部件的空气动力学行为，作为超燃冲压发动机（超音速燃烧冲压喷气发动机）的过渡件和燃烧器，通过 3D 打印或增材制造 (AM) 制造。

设计/方法/方法

对于制造模型的尺寸和结构分析，使用便携式3D扫描仪生成其尺寸的网格，并在实验前后进行比较，还使用粗糙度测量系统验证模型内部的粗糙度。经过测试，粗糙度是一个重要参数，因为它直接影响边界层。对于流动的可视化，使用了非侵入式纹影光学技术。

调查结果

实验是在 2 马赫流量的 SCBT 上进行的，使用制造的原型，并表明在测试电池后模型没有结构和尺寸变化。发现材料呈现的粗糙度不影响产生的流动的质量。这表明所研究的材料也可以应用于超音速流动实验。

原创性/价值

本文提出可以在地面测试设施中使用，用于研究超音速流动（在寒冷条件下），通过 3D 打印制造的零件和模型，而不会影响实验过程中产生的流动质量。这项研究为将 AM 应用于超音速流动研究提供了一个新的视角。