半封闭狭窄通道稀疏孔壁面对流换热特性

李洋; 李维; 陈竞炜; 薛树林; 杨卫华

doi:10.13224/j.cnki.jasp.20220246

半封闭狭窄通道稀疏孔壁面对流换热特性

doi: 10.13224/j.cnki.jasp.20220246

李洋^1,,
李维¹,
陈竞炜¹,
薛树林¹,
杨卫华^2,*, ,

1.
中国航发湖南动力机械研究所中小型航空发动机叶轮机械湖南省重点实验室，湖南株洲 412002
2.
南京航空航天大学能源与动力学院，南京 210016

详细信息

作者简介:
李洋（1988-），男，高级工程师，博士，研究领域为涡轮叶片热防护、空气系统技术。E-mail：buaalzw@126.com

通讯作者:
杨卫华（1972-），男，教授、博士生导师，博士，研究领域为航空航天器先进热防护技术。E-mail：Yangwh@nuaa.edu.cn

中图分类号: V231.1
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- 文章访问数: 193
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- 被引次数: 0
出版历程
- 收稿日期: 2022-04-24
- 网络出版日期: 2023-10-16

Convective heat transfer characteristics of sparse hole wall in semi-closed narrow channel

LI Yang^1
,,
LI Wei¹,
CHEN Jingwei¹,
XUE Shulin¹,
YANG Weihua^{2,*
, ,}

1.
Hunan Key Laboratory of Turbomachinery on Small and Medium Aero-Engine， Hunan Aviation Powerplant Research Institute， Aero Engine Corporation of China，Zhuzhou Hunan 412002，China
2.
College of Energy and Power Engineering， Nanjing University of Aeronautics and Astronautics，Nanjing 210016，China

摘要

摘要:
为了研究双层壁复合冷却涡轮叶片内部对流换热特性，设计了带侧向稀疏孔出流的窄通半封闭道，采用试验方法针对不同通道进口雷诺数和不同出流孔几何参数对出流壁面对流换热特性的影响开展了研究，结果表明：冷气的沿程出流导致在出流孔下游区域产生溢流效应与冲击效应的叠加，在出流孔下游出现典型的水滴状低温区，其覆盖面积随着出流孔径和进口雷诺数的增加而增大；出流壁面的平均努塞尔数沿流动方向呈现四种变化特征，通道进口段的平均换热努塞尔数相比通道下游区高出80%；存在一个最佳出流孔展向间距比，使得壁面的平均表面传热系数达到最大值，大展向孔间距的壁面平均努塞尔数相比中间孔间距情况低20%。
- 涡轮叶片 /
- 对流换热 /
- 双层壁 /
- 侧向出流 /
- 狭窄通道
Abstract:
In order to study the convective heat transfer characteristics inside the double-wall composite cooling turbine blade, a narrow semi-closed passage with lateral outflow through sparse holes was designed. Test methods were used to study the effects of different inlet Reynolds numbers and geometric parameters of outflow holes on the convective heat transfer characteristics of the outflow wall surface. The results showed that, the superposition of overflow effect and impact effect occurred in the downstream area of the outlet hole due to the outflow of cool air. A typical droplet cryogenic zone appeared in the downstream area of the outlet hole, and its coverage area increased with the increase of the outlet hole size and inlet Re number; the average Nusselt number of the outlet wall presented four variation characteristics along the flow direction. The average Nusselt number of the inlet section was 80% higher than that of the downstream section; there was an optimal outlet hole span spacing ratio, so that the average convective heat transfer coefficient on the wall reached the maximum. The average wall Nusselt number of the major hole spacing was 20% lower than that of the intermediate hole spacing.
- turbine blade /
- convective heat transfer /
- double-wall /
- sparse hole wall /
- narrow channel

HTML

图 1 涡轮叶片双层壁结构

Figure 1. Double-walled turbine blades

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图 2 试验系统示意图

Figure 2. Schematic diagram of test system

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图 3 试验结构示意图

Figure 3. Schematic diagram of test section

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图 4 试验件模型示意图

Figure 4. Schematic of test model

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图 5 计算区域的网格

Figure 5. Computational domain grid

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图 6 网格验证

Figure 6. Computational grid check

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图 7 数值计算结果与试验结果的比较（W/d_e=11.4）

Figure 7. Comparison of numerical results with test results （W/d_e=11.4）

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图 8 典型试验表面温度场分布

Figure 8. Temperature field of typical test plate

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图 9 试验板流场特征

Figure 9. Flow field of test plate

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图 10 Re对试验板表面温度场影响（W/d_e=11.4、L/d_e=5.7）

Figure 10. Effect of Re on the wall temperature distributions （W/d_e=11.4，L/d_e=5.7）

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图 11 进口Re对展向平均${\overline{Nu}_{x}}$影响（ W/d_e =11.4、 L/d_e =5.7）

Figure 11. Effect of inlet Re on ${\overline{Nu}_{x}}$ （ W/d_e =11.4， L/d_e =5.7）

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图 12 不同出流孔径时试验板表面温度场（Re=15700、L/d_e=5.7）

Figure 12. Temperature fields of test pieces with different outlet hole diameters （Re=15700，L/d_e=5.7）

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图 13 3种出流孔时展向平均努塞尔数${\overline{Nu}_{x}}$分布（Re=15700，L/d_e=5.7）

Figure 13. Span-wise averaged ${\overline{Nu}_{x}}$distributions with three effluent holes cases （Re=15700，L/d_e=5.7）

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图 14 Re对试验板表面平均$ \overline {Nu} $的影响（L/d_e=5.7）

Figure 14. Effect of Re on surface averaged $ \overline {Nu} $ （L/d_e=5.7）

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图 15 出流孔展向间距对壁面温度场影响（Re=15700、W/d_e=11.4）

Figure 15. Influence of outlet hole spanwise spacing on temperature field （Re=15700，W/d_e=11.4）

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图 16 出流孔展向间距对展向平均努塞尔数${\overline{Nu}_{x}}$的影响

Figure 16. Effect of span-wise hole spacing on ${\overline{Nu}_{x}}$

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图 17 不同出流孔展向间距对试验板表面$ \overline {Nu} $的影响

Figure 17. Effect of Reynolds number on surface averaged $ \overline {Nu} $ distributions with different span-wise hole spacings

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表 1 试验件几何参数

Table 1. Geometric parameters of test pieces

参数数值
工况1 工况2

H/mm 20 20
W/mm 80 80
S₁/mm 22.8 22.8
S₂/mm 28.4 28.4
W/d_e 20 5.7
16
13.3
11.4
10
8.9
L/d_e 5.7 4.3
5.7
7.1
8.6

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