Numerical Investigation of Internal and External Flow Interaction and Overall Cooling Characteristics of Curvature Double-Wall Structures

ZHANG Kaiyuan; LI Zhiyu; LI Zhigang; LI Jun

doi:10.7652/xjtuxb202502006

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Numerical Investigation of Internal and External Flow Interaction and Overall Cooling Characteristics of Curvature Double-Wall Structures

更新时间：2026-01-06

- Numerical Investigation of Internal and External Flow Interaction and Overall Cooling Characteristics of Curvature Double-Wall Structures
- Journal of Xi’an Jiaotong University Vol. 59, Issue 2, Pages: 50-60(2025)
- 作者机构：
  
  西安交通大学能源与动力工程学院， 710049，西安
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202502006
  CLC： TK474.7
- Received：03 July 2024，
  
  Online First：23 October 2024，
  
  Published：10 February 2025
- 稿件说明：
移动端阅览
ZHANG Kaiyuan, LI Zhiyu, LI Zhigang, et al. Numerical Investigation of Internal and External Flow Interaction and Overall Cooling Characteristics of Curvature Double-Wall Structures[J]. Journal of Xi’an Jiaotong University, 2025, 59(2): 50-60.
DOI：

ZHANG Kaiyuan, LI Zhiyu, LI Zhigang, et al. Numerical Investigation of Internal and External Flow Interaction and Overall Cooling Characteristics of Curvature Double-Wall Structures[J]. Journal of Xi’an Jiaotong University, 2025, 59(2): 50-60. DOI： 10.7652/xjtuxb202502006.

摘要

针对双层壁在曲面条件下的内、外流动与冷却耦合特性不明晰的问题，在3种典型冷气吹风比0.4、0.6和0.8下，采用共轭传热数值模拟方法及实验验证，研究了平面和凹、凸曲面双层壁的内、外流动相互影响规律和综合冷却特性。结果表明，曲面显著改变了双层壁的孔内入侵、冲击腔室横流和外壁冷气贴壁特性。低吹风比下，凹面双层壁的气膜孔出流面积最大，冲击驻点区域的冷气横流强度和换热效果显著提升，外壁平均综合冷效能够达到0.54；凸面双层壁的下游气膜冷却和冲击冷却有所增强，同时主流入侵能够到达气膜孔下部；高吹风比下，凹面双层壁气膜孔下方冷气出流区的二次涡面积最大，出射角增加导致气膜孔下游冷却效率略低；凸面双层壁冲击腔内冷气向上游回流最弱，在冲击腔内获得最强的横流累积效果，凸壁面平均综合冷效在第4排孔能达到0.73。研究结果对于叶片等曲面部件的双层壁结构布局设计具有指导意义。

Abstract

To address the unclear internal and external flow interaction and cooling characteristics of curvature double-walls

the conjugate heat transfer numerical simulation method with experimental validation was used in this paper

and the internal and external flow interaction and overall cooling characteristics of planar

concave

and convex double-wall structures were compared under three typical blowing ratios (0.4

0.6 and 0.8). The study analyzed the mutual influences of internal and external flows in curvature double-wall structures and revealed the overall cooling characteristics resulting from the combined effects of internal and external flows. The results show that curvature feature significantly changed the characteristics of hole ingestion

impingement chamber crossflow

and outer wall attachment in double-wall structures. At low blowing ratios

the concave double-wall structure had the largest film hole outflow area

with significantly enhanced crossflow intensity and heat transfer in the impingement stagnation region. The averaged overall cooling effectiveness of the outer wall can reach 0.54. The convex double-wall structure showed enhanced downstream film cooling and impingement cooling

while mainstream ingestion can reach the lower side of the film holes. At high blowing ratios

the concave double-wall structure had the largest secondary vortex area in the coolant outflow region below the film holes. The increased injection angle resulted in slightly lower cooling effectiveness downstream of film holes. The convex double-wall structure had the weakest upstream backflow in the impingement chamber

thereby achieving the strongest crossflow accumulation effect. The averaged overall cooling effectiveness of the convex wall surface can reach 0.73 at the fourth row holes. This study can provide insights for the design of double-wall structural layouts in curved components

e.g.

turbine blades.

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Keywords

references

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