Effect of Squealer Tip with Deep Scale Depth on the Aero-thermodynamic Characteristics of Tip Leakage Flow

BI Shuai, WANG Longfei, WANG Feilong, WANG Lei, LI Ziqiang

热科学学报 ›› 2022, Vol. 31 ›› Issue (5) : 1773-1789.

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Journal of Thermal Science

热科学学报
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热科学学报 ›› 2022, Vol. 31 ›› Issue (5) : 1773-1789. DOI: 10.1007/s11630-022-1683-4  CSTR: 32141.14.JTS-022-1683-4
气动

Effect of Squealer Tip with Deep Scale Depth on the Aero-thermodynamic Characteristics of Tip Leakage Flow

  • BI Shuai, WANG Longfei*, WANG Feilong, WANG Lei, LI Ziqiang
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Effect of Squealer Tip with Deep Scale Depth on the Aero-thermodynamic Characteristics of Tip Leakage Flow

  • BI Shuai, WANG Longfei*, WANG Feilong, WANG Lei, LI Ziqiang
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文章历史 +

摘要


本文对轴流式涡轮的动叶顶部的大尺度深槽叶尖区域的气动热力特性展开数值研究，并与传统常规槽深的叶尖的气热特性展开对比。采用的数值计算方法与公开的实验数据进行了对比。研究中考虑了凹槽深度和叶尖间隙高度两个因素。结果表明：带常规槽深的叶尖凹槽内部的回流涡的尺度随凹槽深度的增加而变大。当凹槽深度由常规尺度发展为大尺度时，凹槽内的速度和高熵产率（EPR）分布的均匀性下降。但是，凹槽深度增至10%叶高时，凹槽内部容积增大，由此增大了间隙和凹槽内两区域的总熵产率。相较于1%叶高的凹槽叶尖，10%叶高的凹槽叶尖的无量纲的总熵产率（DEPR）的增幅最大，高达43.54%，对应的间隙相对泄漏量减少20.6%。在换热方面，凹槽深度大幅增加至10%叶高后，巨大的凹槽容腔可以停留更多的低速流体来覆盖凹槽底部，这削弱了对流换热强度从而缩减了高换热区域，无量纲的平均换热系数相较于1%叶尖的降低40.26%。此外，大尺度深槽叶尖在小间隙时对抑制泄漏更有效，无量纲的平均换热系数的降低幅度随着间隙增大而降低，故在1%叶高的间隙下，凹槽底部的无量纲的平均换热系数降幅最多，在槽深为30%叶高时可以降低72.6%。

Abstract

In this paper, the aero-thermal performance of squealer tips with deep-scale depth is numerically investigated in an axial flow turbine, which is compared with the squealer tip with traditional cavity depth. Numerical methods were validated with experimental data. The effect of cavity depth and tip clearance was considered. The numerical results show that for the squealer tip with conventional cavity depth, the size of the reflux vortex enlarges as the cavity depth increases. The velocity and uniformity of high entropy production rate (EPR) inside the cavity reduce obviously with the cavity developing into deep-scale. However, the increase of depth 10% of the blade span (H) leads to enlargement of cavity volume, which increases the total entropy production rate. And the overall dimensionless entropy production rate (DEPR) of gap and cavity obtains a maximum increase of 43.54% in contrast to the case with 1%H depth cavity. As a result, the relative leakage mass flow rate reduces by 20.6% as the cavity depth increases from 1% to 10%. Given the heat transfer, as the cavity significantly increases to 10%H, the enhanced cavity volume results in a more enormous cavity vortex with low velocity covering the floor, which weakens the convective heat transfer intensity and reduces the area of high heat transfer. The normalized average heat transfer coefficient at the cavity bottom reduces by 40.26% compared to the cavity depth of 1%H. In addition, the deep-scale cavity is more effective in inhibiting leakage flow at smaller tip clearance. The reduction amplitude of normalized average heat transfer coefficient at the squealer floor decreases as tip clearance increases, which reduces at most by about 72.6% for the tip clearance of 1%H.

关键词

squealer tip / turbine aerothermodynamics / tip leakage flow / deep-scale depth / heat transfer / numerical methods

Key words

squealer tip / turbine aerothermodynamics / tip leakage flow / deep-scale depth / heat transfer / numerical methods

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BI Shuai, WANG Longfei, WANG Feilong, WANG Lei, LI Ziqiang. Effect of Squealer Tip with Deep Scale Depth on the Aero-thermodynamic Characteristics of Tip Leakage Flow[J]. 热科学学报, 2022, 31(5): 1773-1789 https://doi.org/10.1007/s11630-022-1683-4
BI Shuai, WANG Longfei, WANG Feilong, WANG Lei, LI Ziqiang. Effect of Squealer Tip with Deep Scale Depth on the Aero-thermodynamic Characteristics of Tip Leakage Flow[J]. Journal of Thermal Science, 2022, 31(5): 1773-1789 https://doi.org/10.1007/s11630-022-1683-4

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基金

The authors gratefully acknowledge the financial supports for the project from the National Science and Technology Major Project of China (2017-III-0010-0036), China Postdoctoral Science Foundation (NO.2020TQ0147) and Natural Science Foundation of Jiangsu Province (NO. BK20200454).

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Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022
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