涡轮叶片波纹内冷通道流动传热机理研究

吴忱韩; 柴军生; 杨小权; 丁珏; 翁培奋

doi:10.13224/j.cnki.jasp.20220073

涡轮叶片波纹内冷通道流动传热机理研究

doi: 10.13224/j.cnki.jasp.20220073

1.
上海大学力学与工程科学学院，上海 200444
2.
中国航发沈阳发动机研究所，沈阳 110015

基金项目: 国家自然科学基金（1210021014，12072186，91952302）

详细信息

作者简介:
吴忱韩（1996-），男，硕士生，主要从事叶轮机械气动热力学研究

通讯作者:
杨小权（1983-），男，教授、博士生导师，博士，研究方向为航空发动机流动传热数值模拟。E-mail：quanshui@shu.edu.cn

中图分类号: V19
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- 文章访问数: 28
- HTML浏览量: 16
- PDF量: 1
- 被引次数: 0
出版历程
- 收稿日期: 2022-02-18
- 网络出版日期: 2024-03-20

Investigation on flow and heat transfer mechanism of corrugated internal cooling channel of turbine cascades

1.
School of Mechanics and Engineering Science，Shanghai University，Shanghai 200444，China
2.
Shenyang Engine Research Institute，Aero Engine Corporation of China，Shenyang 110015，China

摘要

摘要:
针对叶片强化冷却散热的关键科学问题，提出并设计了新型波纹通道冷却结构，开展了精细化数值模拟，分析冷气进口雷诺数和波纹形状参数对其传热性能的影响，研究了高雷诺数涡轮叶片波纹通道冷却结构的流动传热机理。计算结果表明：波纹通道波峰波谷的交替出现对流场有强烈扰动效果，局部表面传热系数可达光滑通道的2～3倍；同一波纹不同位置传热效果不同，在管道收缩处表面传热系数最大；波纹通道传热能力与波纹形状密切相关，在冷气进口雷诺数较大时于H/L=0.115 附近传热效果最佳。论文揭示了波纹通道强化传热的物理机制，为航空发动机叶片冷却结构设计提供技术支撑。
- 涡轮叶片 /
- 流动传热 /
- 表面传热系数 /
- 冷却结构设计 /
- 波纹通道
Abstract:
A new type of corrugated channel cooling structure was proposed and designed for the key scientific problem of strengthening the cooling and heat dissipation of cascades. A refined numerical simulation was carried out to analyze the effect of the cold air inlet Reynolds number and corrugated shape parameters on the heat transfer performance, and the flow and heat transfer mechanism of the corrugated channel cooling structure of the high Reynolds number turbine blade was studied. The calculation results showed that the alternating peaks and troughs of the corrugated channels had a strong perturbation effect on the flow field, and the local heat transfer coefficient was 2—3 times stronger than the smooth channels; the heat transfer effect varied with positions on the same corrugation, and the heat transfer coefficient was the largest at the contraction of the channel; the heat transfer capacity of the corrugated channel was closely related to the shape of the corrugation, and the heat transfer effect was the best near H/L=0.115 when the Reynolds number of cold air inlet was large. The physical mechanism of the corrugated channel to enhance heat transfer was revealed, providing a technical support for the design of the cooling structure of aero-engine cascades.
- turbine cascades /
- flow and heat transfer /
- heat transfer coefficient /
- cooling structure design /
- corrugated channel

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图 1 Mark Ⅱ叶片模型

Figure 1. Model of Mark Ⅱ cascades

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图 2 Mark Ⅱ叶片网格

Figure 2. Grid of Mark Ⅱ cascades

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图 3 网格无关性验证

Figure 3. Grid independence validation

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图 4 叶片中径处表面压力

Figure 4. Surface pressure at the mid-span of cascades

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图 5 叶片中径处表面温度

Figure 5. Surface temperature at the mid-span of cascades

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图 6 叶片中径处表面传热系数

Figure 6. h at the mid-span of cascades

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图 7 冷却通道中径处努塞尔数分布

Figure 7. Nusselt number at the mid-span of cooling channel

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图 8 正弦波纹管模型

Figure 8. Model of sinusoidal corrugated channel

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图 9 带波纹通道Mark Ⅱ叶片网格

Figure 9. Grid of Mark Ⅱ cascades with corrugated channel

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图 10 原叶片内部温度分布

Figure 10. Internal temperature distribution of original cascades

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图 11 新叶片内部温度分布

Figure 11. Internal temperature distribution of new cascades

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图 12 波纹通道流速分布

Figure 12. Flow velocity distribution of corrugated channel

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图 13 波纹通道温度分布

Figure 13. Temperature distribution of corrugated channel

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图 14 冷却通道沿程表面传热系数

Figure 14. h along the cooling channel

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图 15 不同雷诺数下通道表面传热系数

Figure 15. Heat transfer coefficient of different Re

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图 16 不同H/L下通道表面传热系数

Figure 16. h of different H/L

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图 17 波纹通道流线

Figure 17. Streamline of corrugated channel

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图 18 通道努赛尔数与H/L的关系

Figure 18. Relationship between Nu and H/L of the channel

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图 19 通道阻力系数与H/L的关系

Figure 19. Relationship between f and H/L of the channel

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表 1 冷却通道进口条件

Table 1. Inlet conditions of cooling channel

编号	直径/mm	流量/（kg/s）	入口温度/K
1	6.30	0.0246	326
2	6.30	0.0237	316
3	6.30	0.0238	322
4	6.30	0.0247	328
5	6.30	0.0233	308
6	6.30	0.0228	305
7	6.30	0.0238	313
8	3.10	0.0078	335
9	3.10	0.0051	330
10	1.98	0.0033	354

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表 2 波纹通道几何参数

Table 2. Parameters of corrugated channel

波形	L/mm	H/mm	H/L
1	3.81	0.26	0.067
2	3.81	0.38	0.100
3	3.81	0.44	0.115
4	3.81	0.50	0.133
5	3.81	0.65	0.167
6	3.81	0.76	0.200

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表 3 叶片内部温度对比

Table 3. Comparison of internal temperature of cascades

Re/10⁵	原叶片/K	新叶片/K	温降/K
0.8	579	543	36
1.2	551	513	38
1.6	530	492	38
2.0	514	478	36
2.4	502	469	33

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