Experimental and Numerical Investigation of Secondary Flow Structures in an Annular Low Pressure Turbine Cascade Under Periodic Wake Impact—Part 2: Numerical Results
Experimental and Numerical Investigation of Secondary Flow Structures in an Annular Low Pressure Turbine Cascade Under Periodic Wake Impact—Part 2: Numerical Results
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DOI：
10.1115/1.4042283
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发表时间：
2019-02
期刊：
影响因子：
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通讯作者：
Benjamin Winhart;Martin Sinkwitz;A. Schramm;D. Engelmann;F. Mare;R. Mailach
中科院分区：
文献类型：
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作者：
Benjamin Winhart;Martin Sinkwitz;A. Schramm;D. Engelmann;F. Mare;R. Mailach
在这项工作中，我们介绍了在配备改良 T106 型叶片的低压涡轮 (LPT) 上进行的周期性尾流与二次流相互作用的数值研究结果。使用 k-ω 模型通过非稳态雷诺平均纳维-斯托克斯 (URANS) 模拟获得的数值预测与在相同配置下进行的测量进行了比较，结果显示出良好的一致性。基于已验证的数值数据，采用 Q 准则来表征二次流结构并准确识别其来源。对基本尾流运动学和非定常涡迁移的分析揭示了主要的相互作用机制，例如压力侧马蹄涡（HSV）的周向波动及其与通道涡（PV）和集中棚涡（CSV）的直接相互作用。最后，提供了与总压力损失系数的相关性，并给出了传入尾流结构的链接。
In this work, we present the results of the numerical investigations of periodic wake–secondary flow interaction carried out on a low pressure turbine (LPT) equipped with modified T106-profile blades. The numerical predictions obtained by means of unsteady Reynolds-averaged Navier–Stokes (URANS) simulations using a k-ω-model have been compared with measurements conducted in the same configuration and showed a good agreement. Based on the verified numerical data, the Q-criterion has been employed to characterize the secondary flow structures and accurately identify their origin. An analysis of the fundamental wake kinematics and the unsteady vortex migration revealed dominant interaction mechanisms such as the circumferential fluctuation of the pressure side horseshoe vortex (HSV) and its direct interaction with the passage vortex (PV) and the concentrated shed vortex (CSV). Finally, a correlation with the total pressure loss coefficient is provided and a link to the incoming wake structures is given.