Investigation on Characteristics of Flow and Heat Transfer in a Turbine Blade with Trailing-Edge Cutback

doi:10.7652/xjtuxb201810005

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Investigation on Characteristics of Flow and Heat Transfer in a Turbine Blade with Trailing-Edge Cutback

更新时间：2025-07-09

- Investigation on Characteristics of Flow and Heat Transfer in a Turbine Blade with Trailing-Edge Cutback
- Vol. 52, Issue 10, Pages: 31-40+48(2018)
- 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/xjtuxb201810005
  CLC： TK474.7
- Online First：10 October 2018，
  
  Published：2018
- 稿件说明：
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Investigation on Characteristics of Flow and Heat Transfer in a Turbine Blade with Trailing-Edge Cutback[J]. 2018, 52(10): 31-40+48.
DOI：

Investigation on Characteristics of Flow and Heat Transfer in a Turbine Blade with Trailing-Edge Cutback[J]. 2018, 52(10): 31-40+48. DOI： 10.7652/xjtuxb201810005.

摘要

采用带转捩的SST k-ω湍流模型

计算获得了不同来流条件和冷气质量流量比条件下

尾缘开缝透平叶片内的总压损失和传热系数

分析了尾缘开缝结构对叶片表面流动传热性能的影响

并与实验数据进行对比

验证了数值方法的有效性和精度。计算结果表明:与常规叶片相比

尾缘开缝叶片在冷气质量流量比为1.3%、2.6%和5.2%时

叶片吸力面喉部区域压力系数分别增大了0.1、0.15和0.2左右

出口气流角分别增大了0.3°、0.4°和0.5°左右; 尾缘开缝结构对叶片表面对流换热系数的影响区域主要位于吸力面喉部下游

与冷气质量流量比为1.3%的工况相比

尾缘开缝叶片在冷气质量流量比为2.6%和5.2%时

叶片尾缘吸力面侧对流换热系数分别增大了3%和5%左右; 开缝壁面上压力及对流换热系数均随着冷气质量流量比的增大逐渐增大

但当冷气流量一定时

在不同主流雷诺数条件下

开缝壁面上的对流换热系数基本一致; 冷气质量流量比为1.3%和2.6%时

尾缘开缝叶片总压损失比常规叶片高1%左右

当冷气质量流量比为5.2%时

主流总压损失低于常规叶片。

Abstract

The transition SST k-ω model is used to calculate the total pressure loss and heat transfer coefficients in a turbine blade with trailing edge cutback(gillslot)under different inflow conditions and ejection rates. The effects of the trailing edge cutback on the characteristics of flow and heat transfer in the gillslot blade are obtained and compared with the base vane without gillslot. The computing results of the pressure and heat transfer coefficients are compared with the experimental data to validate the present numerical methods. A comparison with the base vane shows that when the ejection rate is at 1.3%

2.6% and 5.2%

the pressure coefficient in the throat region of gillslot vane increases by 0.1

0.15 and 0.2

and the outlet flow angle in gillslot blades increases 0.3°

0.4° and 0.5°

respectively. The influence region of the cutback on heat transfer is mainly located at the downstream area near suction throat. When the ejection rate increases from 1.3% to 2.6% and 5.2%

the heat transfer coefficients on the suction surface of trailing edge increase by about 3% and 5%

respectively. As the ejection rate increases

the static pressure and the heat transfer coefficient on trailing edge cutback gradually increase. However

when the coolant mass flow rate is fixed

the heat transfer coefficients on the cutback surface are not sensitive to the mainstream Reynolds number. When the ejection rate is 1.3% and 2.6%

the total pressure loss in gillslot blade is about 1% higher than that in base vane

while the ejection rate increases to 5.2%

the total pressure loss in gillslot blade is lower than that in base vane.

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references

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