Effects of Oval-Hole and Inclination Angle on the Flow and Heat Transfer Performance of the Turbine Blade with Squealer Tip

doi:10.7652/xjtuxb202101019

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Effects of Oval-Hole and Inclination Angle on the Flow and Heat Transfer Performance of the Turbine Blade with Squealer Tip

更新时间：2025-07-09

- Effects of Oval-Hole and Inclination Angle on the Flow and Heat Transfer Performance of the Turbine Blade with Squealer Tip
- Vol. 55, Issue 1, Pages: 153-161(2021)
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202101019
  CLC： TK474.7
- Online First：10 January 2021，
  
  Published：2021
- 稿件说明：
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Effects of Oval-Hole and Inclination Angle on the Flow and Heat Transfer Performance of the Turbine Blade with Squealer Tip[J]. 2021, 55(1): 153-161.
DOI：

Effects of Oval-Hole and Inclination Angle on the Flow and Heat Transfer Performance of the Turbine Blade with Squealer Tip[J]. 2021, 55(1): 153-161. DOI： 10.7652/xjtuxb202101019.

摘要

为进一步提高叶顶气膜冷却效率

降低叶顶泄漏流量

采用CFX软件数值求解三维RANS方程及标准k-ω湍流模型

研究了应用椭圆冷却孔及径向偏转角后的动叶凹槽叶顶流动与换热特性。以GE-E

第一级动叶为研究对象

将叶片中弧线切线作为椭圆长轴开孔方向

偏转角分为向压力面侧的正向倾斜以及向吸力面侧的反向倾斜

共分析了8种结构在3种吹风比下的数值模拟结果。研究结果表明:无偏角椭圆孔在低吹风比下获得的平均气膜冷却效率比圆孔高1倍以上

高吹风比下椭圆孔冷却效果受限于出流区域收缩有所衰退

正偏角椭圆孔在全吹风比下冷却效果均优于无偏角圆孔; 正偏角结构局部冷却效果较好

但集中冷却在压力面侧区域

负偏角在中高吹风比下有效扩大了冷却范围

但在低吹风比下的冷却效果较差; 正偏角出流指向泄漏流入口

增强了气膜冷却阻塞作用

减小了泄漏流量

泄漏流相对减少率最高达到了11.4%; 负偏角由于大幅度的流动偏转

制造了凹槽内涡流

引入了一部分叶顶外主流

在大偏角结构下的泄漏流相对增长了16.6%。

Abstract

To further improve the blade tip film cooling effectiveness and reduce the tip leakage flow

the flow and heat transfer characteristics of blade squealer tip with the application of oval-hole and radial inclination angle were numerically investigated using the three-dimensional RANS equation and standard k-ω turbulence model based on CFX software. Taking the first stage of GEE3 turbine rotor as the research object

the tangent direction of camber line is designed as the long axis direction of the oval-hole. The inclination angle includes the positive inclination which leans to the pressure side and the negative deflection which leans to the suction side. Numerical simulation results of eight structures were obtained at three blowing ratios. The results show that the average film cooling effectiveness of oval-hole is more than twice that of traditional circular hole at low blowing ratios

but it is limited by the contraction of oval-hole outflow region at high blowing ratios. The cooling effectiveness of the oval-hole with positive inclination angle is better than that of round hole without deflection angle at all blowing ratios. The positive inclination structure has better local cooling effect

but most of the cooling area is on the pressure surface side; however

the negative deflection structure effectively expands the film cooling range at medium and high blowing ratios

but its cooling effect is poor at low blowing ratios. The positive inclination structure leads the film cooling flow towards the leakage flow inlet

which can enhance the blocking effect and reduce the leakage flow

and the maximum relative reduction rate of leakage flow is 11.4%. The negative inclination structure leads to the generation of vortexes in squealer tips due to the large flow deflection

which drains a part of the main flow

and the leakage flow is increased by 16.6% under the large inclination angle structure.

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references

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