Investigations on the Cooling Performance and Pressure Loss Characteristics of Turbine Vane with the Leading Edge Double-Wall Structure

LI Shihan; ZHANG Chaocai; ZHANG Kaiyuan; LI Zhigang; LI Jun

doi:10.7652/xjtuxb202604019

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Investigations on the Cooling Performance and Pressure Loss Characteristics of Turbine Vane with the Leading Edge Double-Wall Structure

更新时间：2026-04-10

- Investigations on the Cooling Performance and Pressure Loss Characteristics of Turbine Vane with the Leading Edge Double-Wall Structure
- Journal of Xi'an Jiaotong University Vol. 60, Issue 4, Pages: 227-238(2026)
- 作者机构：
  
  西安交通大学叶轮机械研究所，710049，西安
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202604019
  CLC： TK14
- Received：23 September 2025，
  
  Online First：29 December 2025，
  
  Published：10 April 2026
- 稿件说明：
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LI Shihan, ZHANG Chaocai, ZHANG Kaiyuan, et al. Investigations on the Cooling Performance and Pressure Loss Characteristics of Turbine Vane with the Leading Edge Double-Wall Structure[J]. Journal of Xi'an Jiaotong University, 2026, 60(4): 227-238.
DOI：

LI Shihan, ZHANG Chaocai, ZHANG Kaiyuan, et al. Investigations on the Cooling Performance and Pressure Loss Characteristics of Turbine Vane with the Leading Edge Double-Wall Structure[J]. Journal of Xi'an Jiaotong University, 2026, 60(4): 227-238. DOI： 10.7652/xjtuxb202604019.

摘要

针对双层壁冷却结构在燃气涡轮高曲率静叶前缘区域的应用效果不佳和流动机理不明晰的问题，基于全覆盖气膜冷却的GE-E

静叶建立了前缘双层壁结构（LEDWS）静叶模型，研究双层壁结构对静叶流动及冷却压力损失特性的影响。采用Fluent流热耦合方法，在3.0%、4.0%、5.0%的前缘冷气质量流量比下对比研究了两种静叶的冷却和压损性能，并通过流线图剖析流动机理；针对LEDWS静叶，研究了上述性能在6个吹风比下的变化趋势。结果表明：试验工况（质量流量为4.0%）下，相比GE-E

静叶，LEDWS静叶的冷气压损提高了50.6%，但叶栅总压损失仅提高0.7%，前缘区域综合冷效可以达到0.81，提高了20.9%；双层壁结构的冲击特征引起冷气动量大幅下降，同时冷气流动角度变化也导致气膜孔入口更大的堵塞涡，因此冷气压损提高，进而又引起吹风比下降，导致大部分区域冷气抬升角度减小，前缘下游冷气出流易受上游冷气形成的湍流卷吸而脱离壁面，但吹风比的下降会加快上游冷气的湍流耗散从而减弱卷吸效应，最终造成气膜冷效提高，结合增强的内部换热，LEDWS静叶的综合冷效提高；LEDWS静叶前缘综合冷却随吹风比增加而递增，最终稳定在0.84左右。

Abstract

To address the limited application effectiveness and unclear flow mechanisms of doublewall cooling structures in the high-curvature leading-edge region of gas turbine vanes，a turbine vane model incorporating a leading-edge double-wall structure（LEDWS）was established based on the GE-E

vane with full-coverage film cooling.The influence of the double-wall configuration on the flow and cooling pressure loss characteristics of the vane was investigated.Using the fluidthermal coupling method in Fluent，the cooling performance and pressure loss were comparatively analyzed at leading-edge coolant mass flow ratios of 3.0%，4.0%，and 5.0%，and the flow mechanisms were examined through streamline patterns.For the LEDWS vane，the variation trends of the aforementioned performance were further studied under six blowing ratios.Results show that under the experimental condition（4.0% mass flow ratio），compared with the GE-E

vane，the coolant pressure loss of the LEDWS vane increases by 50.6%，while the cascade total pressure loss increases by only 0.7%.The overall cooling effectiveness in the leading-edge region reaches 0.81，representing a 20.9% improvement. The impingement characteristics of

the double-wall structure lead to a significant reduction in coolant momentum，while the change in coolant flow direction causes stronger inlet blockage vortices at film holes，thereby increasing coolant pressure loss.This increase in pressure loss subsequently reduces the blowing ratio，which decreases the coolant lift-off angle in most regions.Downstream of the leading edge，the ej ected coolant tends to detach from the wall due to turbulent entrainment induced by upstream coolant structures.However，the reduced blowing ratio accelerates the turbulent dissipation of upstream coolant，weakening the entrainment effect. This ultimately enhances film cooling effectiveness.Combined with improved internal heat transfer，the overall cooling effectiveness of the LEDWS vane is increased.Moreover，the overall cooling effectiveness at the leading edge of the LEDWS vane increases with the blowing ratio and eventually stabilizes around 0.84.

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