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首页> 外文期刊>Journal of engineering materials and technology >Preliminary Design, Modeling, Production, and First Evaluation Tests of a Ti-AI Gas Turbine Blade
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Preliminary Design, Modeling, Production, and First Evaluation Tests of a Ti-AI Gas Turbine Blade

机译：Ti-AI燃气轮机叶片的初步设计，建模，生产和首次评估测试

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摘要

The aim of this work is to design a lightweight, creep-resistant blade for an axial single-stage micro-gas turbine. The selected process was casting of an intermetallic titanium/ aluminum alloy. All the project phases are described, from the preliminary thermodynamic and geometric stage design, to its three-dimensional (3D) modeling and the subsequent finite element method-computational fluid dynamics (FEM-CFD) analysis, to the manufacturing process of the single rotor blade. The blade making (height 7 cm and chord 5 cm, approximately) consisted in a prototyping phase in which a fully 3D version was realized by means of fused deposition modeling and then in the actual production of a full-scale set of blades by investment casting in an induction furnace. The produced items showed acceptable characteristics in terms of shape and soundness. Metallo-graphic investigations and preliminary mechanical tests were performed on the blade specimens. The geometry was then refined by a CFD study, and a slightly modified shape was obtained whose final testing under operative conditions is though left for a later study. This paper describes the spec-to-final product procedure and discusses some critical aspects of this manufacturing process, such as the considerable reactivity between the molten metal and the mold material, the resistance of the ceramic shell to the molten metal impact at high temperatures, and the maximal acceptable mold porosity for the specified surface finish. The CFD results that led to the modification of the original commercial shape are also discussed, and a preliminary performance assessment of the turbine stage is presented and discussed.
机译：这项工作的目的是为轴向单级微型燃气轮机设计一种轻质，抗蠕变的叶片。选择的工艺是铸造金属间钛/铝合金。从初步的热力学和几何阶段设计到其三维（3D）建模以及随后的有限元方法-计算流体力学（FEM-CFD）分析，再到单个转子的制造过程，所有项目阶段均得到描述。刀。叶片制造（高度7厘米，弦长5厘米）大约处于原型制作阶段，在该阶段中，通过熔融沉积建模实现了完整的3D版本，然后通过熔模铸造实际生产了全套叶片在感应炉中。所生产的物品在形状和坚固性方面显示出可接受的特性。对叶片样品进行了金相研究和初步的机械测试。然后通过CFD研究精炼几何形状，并获得略微修改的形状，但仍需在操作条件下进行最终测试，以供以后研究。本文介绍了从规格到最终产品的过程，并讨论了该制造过程的一些关键方面，例如，熔融金属和铸模材料之间的反应性强，高温下陶瓷外壳对熔融金属的抵抗力，以及指定表面光洁度的最大可接受模具孔隙率。还讨论了导致更改原始商业形状的CFD结果，并对涡轮级进行了初步性能评估。

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  • 来源
    《Journal of engineering materials and technology》 |2017年第3期|031005.1-031005.8|共8页
  • 作者

    Andrea Brotzu; Roberto Capata; Ferdinando Felli; Daniela Pilone; Enrico Sciubba;

  • 作者单位

    Department of Chemical Engineering, Materials and Environment, University of Roma "Sapienza," Via Eudossiana 18, Rome 00184, Italy;

    Mem. ASME Department of Mechanical and Aerospace Engineering, University of Roma "Sapienza," Via Eudossiana 18, Rome 00184, Italy;

    Department of Chemical Engineering, Materials and Environment, University of Roma "Sapienza," Via Eudossiana 18, Rome 00184, Italy;

    Department of Chemical Engineering, Materials and Environment, University of Roma "Sapienza," Via Eudossiana 18, Rome 00184, Italy;

    Fellow ASME Department of Mechanical and Aerospace Engineering, University of Roma "Sapienza," Via Eudossiana 18, Rome 00184, Italy;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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