Numerical Investigation for Flow and Heat Transfer Characteristics of Air and Air/Mist Cooling in Gas Turbine Stator Trail Edge Path

doi:10.7652/xjtuxb201611004

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Numerical Investigation for Flow and Heat Transfer Characteristics of Air and Air/Mist Cooling in Gas Turbine Stator Trail Edge Path

更新时间：2025-07-09

- Numerical Investigation for Flow and Heat Transfer Characteristics of Air and Air/Mist Cooling in Gas Turbine Stator Trail Edge Path
- Vol. 50, Issue 11, Pages: 21-27(2016)
- 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/xjtuxb201611004
  CLC： TK47
- Online First：10 November 2016，
  
  Published：2016
- 稿件说明：
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Numerical Investigation for Flow and Heat Transfer Characteristics of Air and Air/Mist Cooling in Gas Turbine Stator Trail Edge Path[J]. 2016, 50(11): 21-27.
DOI：

Numerical Investigation for Flow and Heat Transfer Characteristics of Air and Air/Mist Cooling in Gas Turbine Stator Trail Edge Path[J]. 2016, 50(11): 21-27. DOI： 10.7652/xjtuxb201611004.

摘要

基于通过提高燃气进口温度来提升燃气轮机热效率和增加出力的思想

采用ANSYS-CFX商用软件对模化的燃气轮机透平静叶尾缘楔形柱肋冷却通道中流动与换热特性进行了数值模拟

对比研究了冷却工质为空气和汽雾/空气时的冷却性能

以及不同的雷诺数和雾滴初始直径下雾滴在流动过程中的分布、努塞尔数、摩擦系数以及热力综合效率的变化情况。研究表明:雾滴初始直径越大、雷诺数越大

雾滴的流动距离越长; 相同雷诺数条件下

相对于空气冷却

加入不同初始直径的雾滴可提高通道底面平均努塞尔数

换热效果强化越明显; 底面平均努塞尔数的增幅与雷诺数和雾滴初始直径有关

为了达到最佳冷却效果

应考虑雾滴蒸发吸热和扰流两方面的影响; 在冷却空气中加入雾滴后流动摩擦系数变化较小

综合考虑换热性能与流动阻力

加入汽雾可使热力综合效率最高提高26%。该结果可为燃机设计提供参考。

Abstract

Increasing the turbine inlet temperature is a feasible method to improve the cycle thermal efficiency and power output of a gas turbine. The heat transfer and flow characteristics of air and air/mist cooling in the trail edge path of a gas turbine stator are numerically investigated with ANSYS-CFX. The simulations for different working fluids(air and air/mist)are carried out to find their cooling performance difference. The changes of mist distribution

Nusselt number

flow friction factor and thermodynamic efficiency are analyzed in the cases of different Reynolds number and different initial diameter of mist. The results show that the mist flow distance goes up when Reynolds number and mist initial diameter increase. At the same Reynolds number

the bottom averaged Nusselt number increases when spraying mist with different initial diameter into cooling air. The enhancement of the bottom averaged Nusselt number is related to Reynolds number and the initial mist diameter. To reach the highest cooling performance

the evaporating and disturbance effects of mist ought to be taken into consideration. Spraying mist into cooling air slightly affects the friction factor

but the increase of thermodynamic efficiency can reach up to 26% considering both heat transfer and flow friction.

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references

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