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首页> 外文期刊>Journal of turbomachinery >On the Periodically Unsteady Interaction of Wakes, Secondary Flow Development, and Boundary Layer Flow in An Annular Low-Pressure Turbine Cascade: An Experimental Investigation
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On the Periodically Unsteady Interaction of Wakes, Secondary Flow Development, and Boundary Layer Flow in An Annular Low-Pressure Turbine Cascade: An Experimental Investigation

机译：环状低压涡轮叶栅中苏醒，二次流发展和边界层流的周期性非定常相互作用：实验研究

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摘要

The experimental results reported in this contribution address the time-dependent impact of periodically unsteady wakes on the development of profile and end wall boundary layers and consequently on the secondary flow system. Experimental investigations are conducted on an annular 1.5 stage axial turbine rig at Ruhr-Universitat Bochum's Chair of Thermal Turbomachines and Aeroengines. The object under investigation is a modified T106 profile low-pressure turbine (LPT) stator row at a representative exit flow Reynolds number of 200,000. By making use of an annular geometry instead of a linear cascade, the influence of curvilinear end walls, nonuniform, increasing pitch across the span and radial flow migration can be represented. Incoming wakes are generated by a variable-speed driven rotor equipped with cylindrical bars. Special emphasis is put on the wake-induced recurrent formation, suppression, weakening, and displacement of individual vortices and separated flow regimes. For this, based on a comprehensive set of time-resolved measurement data, the interaction of impinging bar wakes and boundary layer flow and thus separation and its periodic manipulation along the passage end walls and on the blade suction surface are studied within the frequency domain.
机译：在该贡献中报告的实验结果解决了周期性非恒定尾流对型材和端壁边界层发展以及因此对二次流系统的时间依赖性影响。实验研究是在波鸿鲁尔大学的热力涡轮机和航空发动机部门的环形1.5级轴向涡轮机上进行的。研究的对象是改进的T106型低压涡轮（LPT）定子排，其代表出口流雷诺数为200,000。通过使用环形几何结构而不是线性级联，可以表现出曲线形端壁，不均匀，跨距间距增加和径向流迁移的影响。进入的尾流是由配备有圆柱杆的变速驱动转子产生的。特别强调的是尾流引起的循环的形成，抑制，减弱以及单个涡旋和分离流态的位移。为此，基于一组全面的时间分辨测量数据，在频域内研究了撞击棒尾流与边界层流之间的相互作用以及分离以及沿通道端壁和叶片吸力表面的分离及其周期性操作。

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