旋转状态下带顶部出流U型通道流阻和换热特性

李采睿; 由儒全; 车俊新; 刘丽平; 陈文彬

doi:10.13224/j.cnki.jasp.20240520

旋转状态下带顶部出流U型通道流阻和换热特性

doi: 10.13224/j.cnki.jasp.20240520

1.
北京航空航天大学航空发动机研究院，北京 100191
2.
中国航天空气动力技术研究院，北京 100074
3.
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

基金项目: 科工局基础科研计划（JCKY2021601B206）

详细信息

作者简介:
李采睿（1999-），女，硕士，主要从事涡轮叶片内部冷却方面的研究。E-mail：18800151139@163.com

中图分类号: V231.1
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出版历程
- 收稿日期: 2024-07-29
- 网络出版日期: 2024-12-11

Flow resistance and heat transfer characteristics of U-shaped channel with top outflow in rotating state

1.
Research Institute of Aero-Engine，Beihang University，Beijing 100191，China
2.
China Academy of Aerospace Aerodynamics，Beijing 100074，China
3.
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

摘要

摘要:
研究了旋转状态下U型通道顶部出流对转弯段壁面换热及流阻特性的影响。获得了雷诺数在10000～50000、旋转数在0～0.5范围内的不同出流比影响下的U型通道阻力系数与努塞尔数分布。研究结果表明：顶部出流位置对换热的影响较小，变化幅度不超过3%，但对流阻的影响可达37%。在转弯段入口侧布置顶部出流时，流阻最小，且热性能系数最高，较其他出流位置高出14%。总体而言，顶部出流位置通过改变转弯段的流动特性，从而显著影响流阻，而对换热性能的影响则较为有限。在转弯段入口侧布置除尘孔可实现更优的综合换热效果。
- 燃气轮机叶片冷却 /
- 带除尘孔U型通道 /
- 旋转 /
- 流阻 /
- 传热
Abstract:
The influence of the outflow from the top of the U-shaped channel on the heat transfer and flow resistance characteristics of the turning section wall under the rotating state was studied. The distributions of Fanning friction factor and Nusselt number of U-shaped channel under the influences of different outflow ratios with Reynolds number within the range of 10000 to 50000 and rotation number within the range of 0 to 0.5 were obtained. The results showed that the top outlet position had little effect on heat transfer, with a change of less than 3%, but the effect on flow resistance can reach 37%. Specifically, the top outflow model on the inlet side of the turning section exhibited the lowest flow resistance, with a thermal performance coefficient 14% higher than other top outflow positions. In conclusion, the position of the dust removal hole significantly affected the flow state of the fluid in the turning section. While it had a significant influence on flow resistance, its effect on heat transfer was minimal. To achieve a structure with higher thermal performance, it is recommended to select the dust removal hole position at the top of the inlet side of the turning section.
- gas turbine blade cooling /
- U-shaped channel with dust removal hole /
- rotation /
- flow resistance /
- heat transfer

HTML

图 1 除尘孔及其在叶尖上的位置^[10]

Figure 1. Dust hole and location on a blade tip^[10]

下载: 全尺寸图片幻灯片

图 2 物理结构模型示意图和模型1～模型4的U型通道顶部视图

Figure 2. Schematic diagram of physical structure model and model 1 to 4 for top view of U-shaped channel

下载: 全尺寸图片幻灯片

图 3 模型3的网格局部图

Figure 3. Mesh local graph of model 3

下载: 全尺寸图片幻灯片

图 4 阻力系数f随网格数的变化

Figure 4. Variation of friction factor f with the number of grids

下载: 全尺寸图片幻灯片

图 5 数值模拟与文献[20]实验结果的对比验证

Figure 5. Numerical simulation and verification of ref.[20] experimental results

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图 6 沿程阻力系数的变化（Ro=0.3，Re=30000，BR为0和0.3）

Figure 6. Variation of friction factor along path（Ro=0.3, Re=30000, BR of 0 and 0.3）

下载: 全尺寸图片幻灯片

图 7 流线图和Nu/Nu₀分布（Ro=0.3，Re=30000，BR为0和0.3）

Figure 7. Streamlines and Nu/Nu₀ distributions （Ro=0.3, Re=30000, BR of 0 and 0.3）

下载: 全尺寸图片幻灯片

图 8 不同模型整体Nu/Nu₀、f/f₀和TPF的比较（Ro=0.3，Re=30000，BR为0.3）

Figure 8. Comparison of overall Nu/Nu₀, f/f₀ and TPF of different models （Ro=0.3, Re=30000, BR of 0.3）

下载: 全尺寸图片幻灯片

图 9 模型2～模型4整体Nu/Nu₀的变化规律（Ro=0.3，Re=10000～50000）

Figure 9. Variation of overall Nu/Nu₀ of model 2 to 4 （Ro=0.3，Re=10000—50000）

下载: 全尺寸图片幻灯片

图 10 XY平面，Z=0截面速度流线图（Ro=0.3，Re=30000）

Figure 10. Velocity streamline diagram of XY plane, Z=0 cross section （Ro=0.3, Re=30000）

下载: 全尺寸图片幻灯片

图 11 阻力系数变化曲线（Ro=0.3，Re=10000～50000，BR为0和0.3）

Figure 11. Curve of friction factor （Ro=0.3, Re=10000—50000, BR of 0 and 0.3）

下载: 全尺寸图片幻灯片

图 12 阻力系数变化曲线（Re=30000，Ro为0、0.1、0.2、0.3、0.4、0.5）

Figure 12. Curve of friction factor（Re=30000, Ro of 0, 0.1, 0.2, 0.3, 0.4, 0.5）

下载: 全尺寸图片幻灯片

表 1 模型参数

Table 1. Model parameter

模型出流位置出流率 Re/10⁴ Ro

1 不出流 0～0.3 1～5 0～0.5

2 入口段

3 中间段

4 出口段

下载: 导出CSV

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