背风侧倾斜开孔的非均匀布局波纹隔热屏气膜冷却特性研究

穆轶涵; 乔程雨; 刘玉英; 刘广海

doi:10.13224/j.cnki.jasp.20250011

背风侧倾斜开孔的非均匀布局波纹隔热屏气膜冷却特性研究

doi: 10.13224/j.cnki.jasp.20250011

北京航空航天大学能源与动力工程学院，北京 100191

基金项目: 国家科技重大专项（J09-Ⅲ-0016-0060）

详细信息

作者简介:
穆轶涵（2002-），男，硕士生，主要从事航空发动机热端部件冷却研究

通讯作者:
刘玉英（1974-），女，教授，博士，主要从事发动机燃烧研究。E-mail：yyliu@buaa.edu.cn

中图分类号: V231.2
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出版历程
- 收稿日期: 2025-01-07
- 网络出版日期: 2026-04-05

Study on film cooling characteristics of non-uniform layout corrugated heat shield with inclined holes on leeward side

School of Energy and Power Engineering，Beihang University，Beijing 100191，China

摘要

摘要:
针对纵向波纹隔热屏波峰处冷却效率低的问题，提出了一种仅波谷背风侧倾斜开孔的非均匀布局型纵向波纹隔热屏，基于CFD商用软件，使用流固耦合数值模拟方法，与均匀布局、疏密型布局等传统结构方案进行了对比研究，并在孔倾角为20°～40°、吹风比为0.82～1.85的情况下对隔热屏壁面冷却效果进行了分析，研究了孔倾角和吹风比对隔热屏冷却效率的影响规律。结果表明：该方案可以充分利用背风侧动压进气，能显著缩小壁面高温区，提高波峰冷却效率，同时可以改善壁面温度均匀性。孔倾角越小，波谷冷却效率越低，波峰冷却效率越高，波峰冷却效率在孔倾角为30°～35°时最高，相比基准方案提高了5.62%；在吹风比为1.85时，该方案对波峰冷却效率的提升幅度最大，相比基准方案提高了5.57%，但冷却效率均匀系数减小了7.57%。
- 加力燃烧室 /
- 纵向波纹隔热屏 /
- 气膜冷却 /
- 孔倾角 /
- 吹风比
Abstract:
To address the issue of low cooling efficiency at the crests of longitudinally corrugated heat shields, a novel structural—a non-uniformly distributed longitudinally corrugated heat shield with inclined perforations only on the leeward side of the troughs, was proposed. Using commercial CFD software and fluid-solid coupled numerical simulation methods, comparative studies were conducted with traditional structural schemes including uniformly distributed and graded-density configurations. The cooling performance of the heat shield's wall was analyzed under hole inclination angles ranging from 20° to 40° and blowing ratios between 0.82 and 1.85, and the effects of inclination angle and blowing ratio on cooling efficiency were examined. The results showed that the proposed design effectively utilized dynamic pressure intake on the leeward side, significantly reduced high-temperature zones on the wall, improved crest cooling efficiency, and enhanced wall temperature uniformity. A smaller inclination angle decreased trough cooling efficiency but increased crest cooling efficiency, with the crest cooling efficiency reaching its peak at an inclination angle of 30° to 35°, representing a 5.62% improvement compared with the baseline model. At a blowing ratio of 1.85, the maximum enhancement in crest cooling efficiency reached 5.57% compared with the baseline model, though accompanied by a 7.57% reduction in cooling efficiency uniformity coefficient.
- afterburner /
- longitudinal corrugated heat shield /
- film cooling /
- hole inclination angle /
- blowing ratio

HTML

图 1 F110发动机加力燃烧室结构示意图

Figure 1. Schematic diagram of the afterburner chamber structure in the F110 engine

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图 2 隔热屏波纹结构

Figure 2. Structure of corrugated heat shield

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图 3 波纹隔热屏结构与开孔位置

Figure 3. Structure and hole position of corrugated heat shield

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图 4 气膜孔排布

Figure 4. Film hole arrangement

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图 5 计算域（单位：mm）

Figure 5. Calculation region （unit：mm）

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图 6 约定截面名称

Figure 6. Agreed section names

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图 7 流固交界处及气膜孔处y⁺云图

Figure 7. y⁺ contour plot at fluid-solid interface and film cooling holes

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图 8 不同网格计算结果

Figure 8. Calculation results of different grids

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图 9 文献[13]的实验系统及模型

Figure 9. Experimental system and model from Ref. [13]

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图 10 实验与数值结果对比

Figure 10. Comparison of numerical and experimental results

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图 11 不同方案隔热屏沿程展向平均冷却效率

Figure 11. Laterally-averaged cooling efficiency along the streamwise of different schemes

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图 12 不同方案速度分布与流线

Figure 12. Velocity distribution and streamline of different schemes

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图 13 不同方案壁面努塞尔数

Figure 13. Wall Nusselt number of different schemes

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图 14 Case 0与Case 4的展向平均努塞尔数对比

Figure 14. Laterally-averaged Nusselt number comparison between Case 0 and Case 4

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图 15 孔倾角对速度分布与流线的影响

Figure 15. Influence of hole inclination angle on velocity distribution and streamline

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图 16 孔倾角对沿程展向平均冷却效率的影响

Figure 16. Influence of hole inclination angle on laterally-averaged cooling efficiency along the streamwise

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图 17 孔倾角对隔热屏壁面温度分布的影响

Figure 17. Influence of hole inclination angle on distribution of wall temperature of heatshield

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图 18 孔倾角对第5周期波峰平均冷却效率的影响

Figure 18. Influence of hole inclination angle on peak averaged cooling efficiency of fifth period

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图 19 孔倾角对第6周期波峰平均冷却效率的影响

Figure 19. Influence of hole inclination angle on peak averaged cooling efficiency of sixth period

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图 20 孔倾角对冷却效率均匀系数的影响

Figure 20. Influence of hole inclination angle on cooling effectiveness deviation

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图 21 孔倾角对总压恢复系数影响

Figure 21. Influence of hole inclination angle on total pressure recovery coefficient

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图 22 吹风比对隔热屏壁面温度分布的影响

Figure 22. Influence of blowing ratio on distribution of wall temperature of heatshield

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图 23 吹风比对Case 4中Plane 1截面速度分布与流线的影响

Figure 23. Influence of blowing ratio on velocity distribution and streamline for cross-section Plane 1 in Case 4

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图 24 吹风比对沿程展向平均冷却效率的影响

Figure 24. Influence of blowing ratio on laterally-averaged cooling efficiency along the streamwise

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图 25 吹风比对波峰平均冷却效率的影响

Figure 25. Influence of blowing ratio on peak averaged cooling efficiency

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图 26 吹风比对冷却效率均匀系数的影响

Figure 26. Influence of blowing ratio on cooling effectiveness deviation

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表 1 边界条件

Table 1. Boundary conditions

参数	数值
次流入口质量流量$ {\dot{m}}_{\text{cin}} $/（kg/s）	0.00733
主流入口质量流量$ {\dot{m}}_{\text{hin}} $/（kg/s）	0.04199
次流出口质量流量$ {\dot{m}}_{\text{cout}} $/（kg/s）	0.005352
次流入口温度T_c/K	485.6
主流入口温度T_h/K	2100

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表 2 不同孔倾角方案结构参数

Table 2. Structure parameters of different hole inclination angle schemes

方案	孔径d/mm	孔倾角α/（°）	开孔方式
Case 0	0.4	90	垂直
Case 4-20°	0.61	20	倾斜
Case 4-25°	0.61	25	倾斜
Case 4-30°	0.61	30	倾斜
Case 4-35°	0.61	35	倾斜
Case 4-40°	0.61	40	倾斜
Case 3	0.61	90	垂直

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表 3 不同吹风比方案结构参数

Table 3. Structure parameters of different blowing ratio schemes

方案	孔径d/mm	孔倾角α/（°）	M
Case 0-M1.85	0.4	90	1.85
Case 4-α35-M1.85	0.61	35	1.85
Case 0-M1.46	0.45	90	1.46
Case 4-α35-M1.46	0.69	35	1.46
Case 0-M1.18	0.5	90	1.18
Case 4-α35-M1.18	0.76	35	1.18
Case 0-M0.82	0.6	90	0.82
Case 4-α35-M0.82	0.92	35	0.82

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