Multistage Aspects and Unsteady Effects of Stator and Rotor Clocking in an Axial Turbine With Low Aspect Ratio Blading
Multistage Aspects and Unsteady Effects of Stator and Rotor Clocking in an Axial Turbine With Low Aspect Ratio Blading
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DOI：
10.1115/gt2004-53612
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
T. Behr;L. Porreca;T. Mokulys;A. Kalfas;R. Abhari
中科院分区：
文献类型：
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作者：
T. Behr;L. Porreca;T. Mokulys;A. Kalfas;R. Abhari
本文介绍了高压涡轮叶片几何形状中与时钟相关的流动特征和多级效应的最新研究结果。本研究以实验为基础，系统地分析了定子-定子和转子-转子时钟的影响。由于涡轮几何尺寸的低展弦比，流场具有很强的三维性，并以二次流结构为主。该研究旨在确定所涉及的流动相互作用以及对性能改善或降低的相关影响。因此，进行了三维数值分析，以提供所考虑的测试用例的数值背景。实验研究是在两级轴向涡轮研究设施中进行的。涡轮提供了一个真实的多级环境，在这个环境中，定子叶片排和两个转子可以相对地进行时钟测量。所有叶片行都有相同的叶片数，这往往会放大时钟效应。第二阶段采用快速响应气动探头（FRAP）和微型气动五孔探头进行非定常和稳态测量。目前的综合研究表明，低展弦比涡轮定子和转子时钟的多级和非定常流动效应是由低能流体的轴向和径向再分布引起的非线性组合。计时对阶段效率的整体影响由跨跨度的竞争损失产生机制补偿。ASME版权所有©2004
This paper presents the outcome of a recent study in clocking-related flow features and multistage effects occurring in high-pressure turbine blade geometries. The current investigation deals with an experimentally based systematic analysis of the effects of both stator-stator and rotor-rotor clocking. Due to the low aspect ratio of the turbine geometry, the flow field is strongly three-dimensional and is dominated by secondary flow structures. The investigation aims to identify the flow interactions involved and the associated effects on performance improvement or degradation. Consequently a three-dimensional numerical analysis has been undertaken to provide the numerical background to the test case considered. The experimental studies were performed in a two-stage axial research turbine facility. The turbine provides a realistic multi-stage environment, in which both stator blade rows and the two rotors can be clocked relative to each other. All blade rows have the same blade number count, which tends to amplify clocking effects. Unsteady and steady measurements were obtained in the second stage using fast response aerodynamic probes (FRAP) and miniature pneumatic 5-hole probes. The current comprehensive investigation has shown that multistage and unsteady flow effects of stator and rotor clocking in low aspect ratio turbines are combined in a nonlinear fashion caused by axial and radial redistribution of low energy fluid. The integral result of clocking on stage efficiency is compensated by competing loss generating mechanisms across the span.Copyright © 2004 by ASME