Experimental and Numerical Investigation of Secondary Flow Structures in an Annular Low Pressure Turbine Cascade Under Periodic Wake Impact—Part 1: Experimental Results
Experimental and Numerical Investigation of Secondary Flow Structures in an Annular Low Pressure Turbine Cascade Under Periodic Wake Impact—Part 1: Experimental Results
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DOI：
10.1115/1.4042284
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发表时间：
2019-02
期刊：
影响因子：
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通讯作者：
Martin Sinkwitz;Benjamin Winhart;D. Engelmann;F. Mare;R. Mailach
中科院分区：
文献类型：
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作者：
Martin Sinkwitz;Benjamin Winhart;D. Engelmann;F. Mare;R. Mailach
在鲁尔-波鸿大学热力透平机械和航空发动机教席的环形1.5级轴流涡轮试验台上，对改进的T106低压涡轮(LPT)型线进行了实验研究。该装置可以对空间和时间上的非定常尾迹-定子流动相互作用进行高分辨率测量。进入的尾流是由配备圆柱杆的变速驱动转子产生的。本文提出了一种研究非定常现象的实验方法。提供了定子出口二维流场的时间平均和瞬时测量数据，为分析周期性非定常涡的形成、位移和抑制提供了依据。此外，还利用时间精度较高的叶片压力数据研究了定子排下游的流动结构与叶片上的瞬时间歇尾迹冲击之间的关系。文中还讨论了与观测结果相关的杆状尾迹运动学。
Experimental studies have been conducted on a modified T106 low pressure turbine (LPT) profile in an annular 1.5 stage axial turbine rig at the Chair of Thermal Turbomachines and Aeroengines, Ruhr-Universität Bochum. The rig setup allows the highly resolved measurement of unsteady wake–stator flow interaction in both space and time. Incoming wakes are generated by a variable-speed driven rotor equipped with cylindrical bars. In the present paper, an experimental approach to the investigation of unsteady phenomena is proposed. Time-averaged and instantaneous measurement data from 2D flow field traverses at the stator exit are provided for the analysis of the periodically unsteady vortex formation, displacement, and suppression. Additional time-accurate blade pressure data are used to study the relationship between the flow structures downstream of the stator row and the immediate intermittent wake impact on the blades. Bar wake kinematics is also discussed in relation to the observations.