Effects of Squealer Winglet on the Aerodynamic and Heat Transfer Performances of Turbine Rotor Blade Tip

doi:10.7652/xjtuxb201909002

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Effects of Squealer Winglet on the Aerodynamic and Heat Transfer Performances of Turbine Rotor Blade Tip

更新时间：2025-07-09

- Effects of Squealer Winglet on the Aerodynamic and Heat Transfer Performances of Turbine Rotor Blade Tip
- Vol. 53, Issue 9, Pages: 7-14+41(2019)
- 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/xjtuxb201909002
  CLC： TK474.7
- Online First：10 September 2019，
  
  Published：2019
- 稿件说明：
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Effects of Squealer Winglet on the Aerodynamic and Heat Transfer Performances of Turbine Rotor Blade Tip[J]. 2019, 53(9): 7-14+41.
DOI：

Effects of Squealer Winglet on the Aerodynamic and Heat Transfer Performances of Turbine Rotor Blade Tip[J]. 2019, 53(9): 7-14+41. DOI： 10.7652/xjtuxb201909002.

摘要

针对叶顶间隙的高速泄漏流及复杂的流动问题

采用数值求解三维RANS方程和k-ω湍流模型方法

研究了凹槽状小翼结构对涡轮级动叶叶顶传热特性和气动性能的影响。数值获得的叶顶表面传热系数分布和实验数据吻合良好

验证了数值方法的可靠性。对比分析了叶顶压力侧、叶顶吸力侧和叶顶两侧凹槽状小翼结构与无小翼凹槽状叶顶的气动传热性能

研究结果表明

相比于无小翼凹槽状叶顶结构:叶顶压力侧、吸力侧和两侧凹槽状小翼结构的叶顶表面平均传热系数分别降低了12.2%、17.1%和19.8%

叶顶两侧凹槽状小翼结构最大程度降低了凹槽状叶顶间隙的泄漏流量

减弱了压力侧角涡和刮削涡

进而降低了凹槽状叶顶的传热系数; 压力侧、吸力侧和两侧凹槽状小翼结构的动叶总压损失系数分别增加了8.5%、降低了8.5%和降低了2.5%。吸力侧凹槽状小翼结构能有效降低凹槽状叶顶的传热系数

并且减少气动损失

具有最佳的气热性能。

Abstract

Effects of squealer winglet structure on the heat transfer characteristics and aerodynamic performance of turbine rotor blade tip are numerically investigated using Reynolds-averaged Navier-Stokes(RANS)equation and k- turbulence model.Numerical results of the heat transfer coefficients distribution at rotor blade tip agree well with the experimental data and the reliabilty of this numerical method is validated.The numerical results show that the average heat transfer coefficients of rotor blade tip with squealer winglet structure on the pressure side or suction side

as well as on both pressure and suction sides

are decreased by 12.2%

17.1% and 19.8%

respectively

in comparison with those of traditional squealer tip.Squealer winglet structure on the pressure and suction sides of the rotor blade tip can decrease the tip leakage flow and weaken the influence of corner and scraping vortexes near the pressure side.This flow behavior also decreases the heat transfer coefficient of rotor

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references

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