Clocking in Low-Pressure Turbines
Clocking in Low-Pressure Turbines
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低压涡轮机计时
DOI：
10.1115/1.4036341
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Evans K
中科院分区：
文献类型：
--
作者：
Evans K
采用低速两级低压涡轮（LPT）对定子时钟的影响进行了实验和计算研究。LPT是专门设计的，通过将定子1尾迹段与定子2前缘沿跨对齐来最大化时钟潜力。经验证，尾迹段在整个跨度上的对齐范围不超过定子节距的10%。所测得的时钟对功提取的影响为0.12%，对效率的影响为0.08%。虽然时钟的影响很小，但它是可重复的，在四个定子螺距之间是周期性的，并且在独立测量之间是一致的。此外，还讨论了可靠的时钟调查需要考虑的因素。测量结果表明，对功提取的大部分时钟效应发生在阶段2，它起源于定子2出口。这表明流动在定子2内被不同地处理。这对第一阶段的工作也有影响。在每个叶片排中，测量的时钟对损失功的影响在整个跨度中是相似的。网格腔的计算在阶段1中没有捕捉到任何时钟效应。这说明旋翼1内部的非定常粘滞现象没有被完全紊流计算所捕捉，如非定常转捩。然而，计算确实捕获了阶段2工作提取的测量时钟效应。假设定子2流动转向的时钟效应是由一个稳定的、无粘性的过程主导的。
The effect of stator clocking has been experimentally and computationally investigated using a low-speed, two-stage, low-pressure turbine (LPT) which was specifically designed to maximize the clocking potential by aligning the stator 1 wake segments with the stator 2 leading edge along the span. It was verified that the wake segments are aligned to within 10% of stator pitch across the span. The measured clocking effect on the work extraction is 0.12% and on efficiency is 0.08%. Although the effect of clocking is small, it is repeatable, periodic across four stator pitches and consistent between independent measurements. Furthermore, factors to consider for a reliable clocking investigation are discussed. The measurements revealed that the majority of the clocking effect on the work extraction occurs in stage 2 and it originates at stator 2 exit. This indicates that the flow is being processed differently within stator 2. There is also an effect on the stage 1 work. In each blade row, the measured clocking effect on the lost work is similar across the span. The computations with meshed cavities do not capture any clocking effects in stage 1. This indicates that an unsteady viscid phenomenon within rotor 1 is not captured by the fully turbulent calculation, e.g., unsteady transition. However, the computations do capture the measured clocking effect on the stage 2 work extraction. It is hypothesized that the clocking effect on stator 2 flow turning is dominated by a steady, inviscid process.
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DOI：
10.1115/gt2016-56667
发表时间：
2016
期刊：
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影响因子：
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作者：
Evans K
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1997
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发表时间：
1993
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DOI：
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发表时间：
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