Numerical Investigation of Interactive Film Cooling Effect Between Blade Showerhead and Endwall in Turbine Cascade Leading Edge Region

ZHANG Kaiyuan; ZHANG Chaocai; LI Zhiyu; LI Zhigang; LI Jun

doi:10.7652/xjtuxb202508010

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Numerical Investigation of Interactive Film Cooling Effect Between Blade Showerhead and Endwall in Turbine Cascade Leading Edge Region

更新时间：2025-07-30

- Numerical Investigation of Interactive Film Cooling Effect Between Blade Showerhead and Endwall in Turbine Cascade Leading Edge Region
- Journal of Xi’an Jiaotong University Vol. 59, Issue 8, Pages: 100-111(2025)
- 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/xjtuxb202508010
  CLC： TK474.7
- Received：14 January 2025，
  
  Online First：12 March 2025，
  
  Published：10 August 2025
- 稿件说明：
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ZHANG Kaiyuan, ZHANG Chaocai, LI Zhiyu, et al. Numerical Investigation of Interactive Film Cooling Effect Between Blade Showerhead and Endwall in Turbine Cascade Leading Edge Region[J]. Journal of Xi’an Jiaotong University, 2025, 59(8): 100-111.
DOI：

ZHANG Kaiyuan, ZHANG Chaocai, LI Zhiyu, et al. Numerical Investigation of Interactive Film Cooling Effect Between Blade Showerhead and Endwall in Turbine Cascade Leading Edge Region[J]. Journal of Xi’an Jiaotong University, 2025, 59(8): 100-111. DOI： 10.7652/xjtuxb202508010.

摘要

针对燃气涡轮叶栅前缘角区不同部件的多源冷气射流与二次流掺混机理不明晰和极高热负荷的问题，数值研究了叶片喷淋头射流、端壁前缘气膜孔射流和端壁上游槽缝射流在前缘区域的流动掺混和交互冷却特性。结果表明，叶片喷淋头冷气能够通过在端壁的再附着对热环区域起到二次冷却作用，并通过改变二次流生成强度影响端壁冷气分布。当端壁吹风比较小时，叶片与端壁冷气在马蹄涡的阻隔下掺混较弱，端壁冷气在热环外侧马蹄涡边沿的直接附着形成条形冷却保护，叶片冷气通过再附着对端壁吸力侧角区形成二次冷却，随叶片吹风比

的增大，吸力侧马蹄涡及其卷吸的端壁冷气更加靠近叶片，其与喷淋头射流掺混增强，前缘区域平均冷却效率提升0.04，

=1.0时叶片喷淋头冷气在角区的覆盖沿轴向分布最为均匀。当端壁吹风比较大时，端壁冷气与叶片冷气掺混强烈并对角区形成较好的气膜冷却保护，主要发生于角区的冷气掺混现象导致上游槽缝与端壁气膜孔之间存在较大无冷却区，随

增大吸力侧角区的冷气掺混显著增强，端壁0

（轴向坐标与轴向弦长之比）

0.1区域的平均冷却效率提升了0.08。研究结果表明，在叶栅端壁前缘冷却布局设计时应考虑叶片冷气的二次冷却作用，同时关注其对二次流生成及在下游发展强度的影响。

Abstract

To address the unclear mixing mechanisms of multi-source coolant injections and secondary flows from and the extremely high thermal load in different components the corner region of gas turbine cascade leading edges

a numerical study is conducted on the flow mixing and interactive cooling characteristics of blade showerhead injection

endwall leading-edge film-hole injection

and upstream endwall slot injection in the leading-edge region. The results indicate that the blade showerhead coolant can provide secondary cooling to the hot ring region by reattaching to the endwall

while also influencing the endwall coolant distribution by altering the strength of secondary flow generation. When the endwall blowing ratio is low

the mixing between blade and endwall coolant is weak due to the blocki

ng effect of the horseshoe vortex. The endwall coolant directly attaches to the outer edge of the horseshoe vortex near the hot ring

forming strip-like cooling protection

while the blade coolant provides secondary cooling to the suction-side corner region through reattachment. As the blade blowing ratio (

) increases

the suction-side horseshoe vortex and the entrained endwall coolant move closer to the blade

enhancing mixing with the showerhead injection. This raises the average cooling efficiency in the leading-edge region by 0.04. At

=1.0

the blade showerhead coolant achieves the most uniform axial distribution in the corner region. When the endwall blowing ratio is high

strong mixing between endwall and blade coolant provides improved film cooling protection in the corner region. However

the dominant mixing phenomenon in the corner region creates a large uncooled zone between the upstream slot and endwall film holes. As

increases

the coolant mixing in the suction-side corner region intensifies significantly

improving the average cooling efficiency by 0.08 in the endwall region where 0

(axial coordinate to axial chord ratio)

0.1. The findings suggest that the secondary cooling effect of blade coolant should be considered in the design of endwall leading-edge cooling configurations

along with its influence on secondary flow generation and downstream development intensity.

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references

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