Separated Flow Transition on an LP Turbine Blade With Pulsed Flow Control
Separated Flow Transition on an LP Turbine Blade With Pulsed Flow Control
复制标题
采用脉冲流量控制的低压涡轮叶片上的分离流量过渡
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
Matthew J. Bloxham
中科院分区：
文献类型：
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作者：
J. Bons;Daniela Reimann;Matthew J. Bloxham
在低速线性叶栅装置中，对高负荷低压涡轮叶片进行了流动测量。该叶片的设计Zweifel系数为1.34，峰值压力系数接近47%的轴弦(中载)。流动和表面压力数据取自REC=20,000，入口自由流湍流为3%。在这些工况下，在叶片吸力面的下游部分形成了一个大的分离气泡，从59%的轴弦延伸到86%的轴弦。获得了单元素热膜测量，以清楚地确定边界层转变在该分离区域中的作用。高阶湍流统计量被用来识别过渡区和分离区。在分离气泡(50%cx)上游的脉冲涡流发生器射流存在非定常强迫的情况下，也进行了类似的测量。测量提供了在这种非定常环境中边界层转换和分离相互作用的综合图景。强调了脉冲流动控制和非定常尾迹运动的相似之处。
Flow measurements were made on a highly loaded low pressure turbine blade in a low-speed linear cascade facility. The blade has a design Zweifel coefficient of 1.34 with a peak pressure coefficient near 47% axial chord (midloaded). Flow and surface pressure data were taken for Re c =20,000 with 3% inlet freestream turbulence. For these operating conditions, a large separation bubble forms over the downstream portion of the blade suction surface, extending from 59% to 86% axial chord. Single-element hot-film measurements were acquired to clearly identify the role of boundary layer transition in this separated region. Higher-order turbulence statistics were used to identify transition and separation zones. Similar measurements were also made in the presence of unsteady forcing using pulsed vortex generator jets just upstream of the separation bubble (50% c x ). Measurements provide a comprehensive picture of the interaction of boundary layer transition and separation in this unsteady environment. Similarities between pulsed flow control and unsteady wake motion are highlighted.