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首页> 外文期刊>Journal of aerospace engineering >Performance Impacts of Metal Additive Manufacturing of Very Small Nozzles
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Performance Impacts of Metal Additive Manufacturing of Very Small Nozzles

机译：金属添加剂制造非常小喷嘴的性能影响

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摘要

For small satellite electrothermal or chemical thrusters, nozzle throat diameters may be less than 1 mm. At these sizes, the effects of flow surface roughness on nozzle performance must be considered. In this research, nozzles were processed using a nickel alloy by laser powder bed fusion (LPBF), a form of additive manufacturing. Experimentally, the thrust coefficient was measured over a range of targeted throat Reynolds numbers and nozzle expansion ratios. Additional nozzles were manufactured using traditional machining practices to compare performance at similar flow conditions. An analytic model was then developed to determine that performance may not be predicted by traditional viscous loss theory. Surface features of the LPBF manufactured nozzles appear to have caused bow shock systems that overwhelm all other impacts, limiting performance of the as-printed nozzles. This imperfection was then implemented into a computational fluid dynamics (CFD) flow study, showing shock wave reflections and similar thrust losses.
机译：对于小卫星电热或化学推进器，喷嘴喉部直径可以小于1mm。在这些尺寸下，必须考虑流动表面粗糙度对喷嘴性能的影响。在该研究中，使用激光粉床融合（LPBF），一种添加剂制造的镍合金加工喷嘴。实验地，在一系列靶向喉部雷诺数和喷嘴膨胀比上测量推力系数。使用传统的加工实践制造额外的喷嘴，以比较在类似的流动条件下的性能。然后开发了分析模型以确定传统粘性损失理论可能无法预测性能。 LPBF制造喷嘴的表面特征似乎引起了弓形冲击系统，这压倒了所有其他影响，限制了由印刷喷嘴的性能。然后将该缺陷实施到计算流体动力学（CFD）流程研究中，示出了冲击波反射和类似的推力损失。

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  • 来源
    《Journal of aerospace engineering》 |2021年第2期|04020115.1-04020115.11|共11页
  • 作者

    Tommila Christopher D.; Hartsfield Carl R.; Redmond Joel J.; Komives Jeffrey R.; Shelton Travis E.;

  • 作者单位

    US Air Force Acad 2354 Fairchild Dr Colorado Springs CO 80840 USA;

    Air Force Inst Technol 2950 Hobson Way Wright Patterson AFB OH 45434 USA;

    Air Force Inst Technol 2950 Hobson Way Wright Patterson AFB OH 45434 USA;

    Air Force Inst Technol 2950 Hobson Way Wright Patterson AFB OH 45434 USA;

    Air Force Inst Technol 2950 Hobson Way Wright Patterson AFB OH 45434 USA;

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