ANALYSIS OF HEAT EXCHANGE BEHAVIOR CONCERNING AIR-FILM COOLING OF FIRST-STAGE BLADES OF ONE GAS TURBINE

MI Ke1; CHU Guihong1; QIU Luke1; WANG Xinjun2 1.Xi'an Thermal Power Research Institute Co Ltd

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ANALYSIS OF HEAT EXCHANGE BEHAVIOR CONCERNING AIR-FILM COOLING OF FIRST-STAGE BLADES OF ONE GAS TURBINE

更新时间：2025-09-28

- ANALYSIS OF HEAT EXCHANGE BEHAVIOR CONCERNING AIR-FILM COOLING OF FIRST-STAGE BLADES OF ONE GAS TURBINE
- Thermal Power Generation Vol. 41, Issue 6, Pages: 19-23(2012)
- 作者机构：
  
  1. 西安热工研究院有限公司
  2. 西安交通大学能源与动力工程学
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK471
- Published：2012
- 稿件说明：
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MI Ke1, CHU Guihong1, QIU Luke1, et al. ANALYSIS OF HEAT EXCHANGE BEHAVIOR CONCERNING AIR-FILM COOLING OF FIRST-STAGE BLADES OF ONE GAS TURBINE[J]. Thermal power generation, 2012, 41(6): 19-23.
DOI：

MI Ke1, CHU Guihong1, QIU Luke1, et al. ANALYSIS OF HEAT EXCHANGE BEHAVIOR CONCERNING AIR-FILM COOLING OF FIRST-STAGE BLADES OF ONE GAS TURBINE[J]. Thermal power generation, 2012, 41(6): 19-23. DOI：

摘要

利用附加源项法

对某台燃气轮机开设多排气膜孔的第1级叶片外侧换热特性

包括叶片表面温度、气膜有效度和换热系数的分布进行计算及数值分析

并对叶栅换热特性进行了数值验证。结果表明

预测值Nu与试验值吻合较好;在压力面

叶片外表面温度平均可降低40%

平均气膜有效度约0.7;吸力面温度平均降低30%

平均气膜有效度约0.5。但是

在压力面20%相对弦长区域、前缘驻点和吸力面尾缘处的温度较高

气膜有效度较低。所给出的叶片外侧换热特性

可作为叶片内部结构的设计依据

通过在叶片内部前缘驻点和压力面20%相对弦长区域采用冲击冷却、增加吸力面尾缘冷却气体流量可降低该区域所受到的热负荷

从而使叶片能够均匀冷却。

Abstract

By using the NUMERCA software

the external heat exchange behavior of first-steage blades

such as the surface temperature of blades

the effectiveness of air film

and the distribution of heat exchange coefficient etc.

boasting many rows of air film orifices opened on them of one gas turbine has been calculated and numerically analysed

and the heat exchange behavior of blade cascade being numerically verified.It shows that the predicted value Nu tallies well with the tested value.On the pressurized area

the surface temperature of blades can be reduced by 40% on the average

the average effectiveness of air film being about 0.7;on the suction area

the temperature reduced 30% on the average

the average effectiveness of air film being about 0.5;but

the temperature on cord-length region relative to 20% of the pressurized area

at standing points on front edge and on the tail edge of the suction area was higher

and the effectiveness of air film being lower.The given external behavior of blades can be used as design basis of blades' internal structure;at standing point on front edge inside the blades and on the cord-length rigion relative to 20% of the suction area

impact cooling has to be used

increasing the flow rate of cooling air at tail edge of the suction area

reducing thermal load on said region

so as to make the blades to be uniformly cooled.

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