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INTRODUCTION OF A PROJECT-BASED-COURSE IN TURBINE STAGE DESIGN FOR UNDERGRADUATE STUDENTS AT GRAZ UNIVERSITY OF TECHNOLOGY

机译:格拉茨理工大学本科学生涡轮机舞台设计中介绍了基于项目的课程设计

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This 5 day-course is offered to undergraduate students at the Institute for Thermal Turbomachinery and Machine Dynamics at Graz University of Technology. Goal of the course is to give students an holistic education and to train a "understanding of systems function as wholes". Within this course students are designing an axial turbine stage from the very beginning and apply all the theory learned in separate courses before. At first the students design the annulus and the blades. They determine the inlet and outlet velocity triangles for several channel heights and define the camber line of the profile before a thickness distribution is superimposed. Secondly, a 3d CAD model including a disk design is created to get a realistic blade root. Then the students perform a finite element analysis (FEA) of the rotor blade and evaluate mechanical stresses in distinct sections of the blade. Also, natural frequencies are determined and a Campbell diagram is calculated. If the students have proven that there design is free from mechanical problems a steady state simulation of the flow through one passage is performed. Due to the fact that there is one numerical simulation platform for FEA as well as for CFD, a coupling of the fluid structure interaction (FSI) can be realised as final step. In a 1 way FSI analysis the students evaluate basic aeroelastic characteristics. After finishing that theoretical part an experimental part follows in which the students measure the static wall pressure distribution on the suction and pressure surface of that particular mid span profile in a subsonic wind tunnel. Natural frequencies are also experimentally determined using laser vibrometers. At the end of the course students will "produce" their own rotor blade with a 3d-printer. The blade can be kept as a souvenir. This paper describes the content of the course in detail and presents some results of last year's class and reports the feedback of the students.
机译:这5天课程提供给Graz技术大学的热涡轮机械和机器动态研究所的本科生。该课程的目标是为学生提供一个整体教育,并培训“对系统功能的理解”。在本课程中,学生从一开始就设计了一个轴向涡轮机阶段,并在以前的单独课程中应用所有理论。首先,学生设计环形和刀片。它们确定用于多个通道高度的入口和出口速度三角形,并在叠加厚度分布之前定义轮廓的弧形线。其次,创建一个包括磁盘设计的3D CAD模型以获得现实的刀片根。然后,学生对转子叶片进行有限元分析(FEA),并在叶片的不同切片中评估机械应力。此外,确定了自然频率,并计算坎贝尔图。如果学生证明,设计没有机械问题,则执行通过一个通道的流动的稳态模拟。由于FEA的一个数值模拟平台以及CFD,流体结构相互作用(FSI)的耦合可以实现为最终步骤。以1路FSI分析,学生评估基本的空气弹性特性。在完成理论部分之后,遵循的实验部分,其中学生测量亚音风隧道中该特定中间跨度轮廓的吸力和压力表面上的静壁压力分布。使用激光振动器还通过激光振动器进行实验确定自然频率。在课程结束时,学生将使用3D打印机“生产”自己的转子刀片。刀片可以保存为纪念品。本文详细介绍了课程的内容,并提出了去年类的一些结果,并报告了学生的反馈。

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