旋转状态带扰流柱楔形通道换热特性研究

张学姣; 由儒全; 李海旺; 韩贺明

doi:10.13224/j.cnki.jasp.20220910

旋转状态带扰流柱楔形通道换热特性研究

doi: 10.13224/j.cnki.jasp.20220910

北京航空航天大学航空发动机研究院，北京 100191

基金项目: 重型燃气轮机透平叶片冷却设计方法与数据库项目（J2019-Ⅲ-0007-0050）

详细信息

作者简介:
张学姣（1990-），女，博士生，研究方向为涡轮叶片旋转换热。E-mail：by2032129@buaa.edu.cn

通讯作者:
由儒全（1991-），男，副研究员，博士，主要从事涡轮叶片旋转换热研究。E-mail：youruquan10353@buaa.edu.cn

中图分类号: V231.1
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出版历程
- 收稿日期: 2022-11-27
- 网络出版日期: 2024-12-21

Investigation on heat transfer characteristics of trapezoidal channel with pin fins in rotating state

Research Institute of Aero-Engine，Beihang University，Beijing 100191，China

摘要

摘要:
实验研究了涡轮叶片旋转状态下带扰流柱侧向出流楔形通道换热特性。研究雷诺数范围为10000～80000、转速范围为0～1000 r/min。旋转增强了通道的前、后缘面平均换热，在通道内部X/D=8.23位置换热增强最明显：在雷诺数为10000时，转速为1000 r/min时比100 r/min前后缘平均换热增强211%，当雷诺数为80000时增强44.4%。在通道外部，各无量纲位置的换热均随着转速的增加而缓慢增加，不同无量纲位置的换热强化程度没有显著差异。转速为1000 r/min时，雷诺数增大会增强换热：内部光滑区域无量纲位置X/D=3.97，雷诺数为80000时换热是雷诺数为10000时的3.31倍；外部扰流柱区域无量纲位置X/D=8.23，雷诺数为80000时的换热是雷诺数为10000时的1.47倍。补充了涡轮叶片尾缘带扰流柱楔形通道在高雷诺数和高旋转数条件下的换热。
- 换热 /
- 楔形通道 /
- 扰流柱 /
- 尾缘冷却 /
- 旋转数
Abstract:
The flow and heat transfer characteristics of a typical cooling channel model in a turbine blade, namely, a rotating lateral outlet wedge channel with pin fins, were experimentally investigated. The Reynolds number range was 10000—80000 and the speed range was 0—1000 r/min. The rotation enhanced the heat transfer and the heat transfer enhancement was most obvious at the position of X/D=8.23 of inner area. When the Reynolds number was 10000, the average heat transfer at 1000 r/min was 211% higher than that at 100 r/min, and when the Reynolds number was 80000, it was 44.4% higher. At the outer area of channel, the heat transfer at each non-dimensional position increased slowly with the increase of rotating speed, and there was no significant difference in the heat transfer enhancement degree at different non-dimensional positions. At the same time, increasing Reynolds number could enhance the effect of rotation. When the speed was 1000 r/min, the heat transfer enhancement in the inner smooth area was most obvious at the position of X/D=3.97. At 80000 Reynolds number, the heat transfer coefficient at this point was 3.31 times that at 10000 Reynolds number. At the position of X/D=8.23, the heat transfer enhancement in the outer pin fin area was most obvious. The heat transfer enhancement at Reynolds number 80000 was 1.47 times that at Reynolds number 10000. The research supplemented the heat transfer in the tapered channel with pin fin at the trailing edge of turbine blade at high Reynolds number and high rotation number.
- heat transfer /
- trapezoidal channel /
- pin fins /
- trailing edge cooling /
- rotation number

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图 1 旋转换热实验台

Figure 1. Rotating heat transfer experimental platform

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图 2 实验模型结构图（单位：mm）

Figure 2. Diagram of the experimental section （unit：mm）

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图 3 静止状态下与参考文献[23]对比

Figure 3. Comparison with reference [23] in stationary state

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图 4 静止状态通道内部区域沿程Nu 分布

Figure 4. Nu distribution along the internal region of the static channel

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图 5 转速为1000 r/min时内部区域沿程Nu 数分布

Figure 5. Nu distribution along the internal region at 1000 r/min

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图 6 内部区域$ \overline {Nu}/\overline {{Nu}_{{\mathrm{s}}}} $分布

Figure 6. Distribution of $ \overline {Nu}/\overline {{Nu}_{{\mathrm{s}}}} $ of inner area

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图 7 外部区域$ \overline{Nu}/\overline{Nu_{\mathrm{s}}} $分布

Figure 7. Distribution of $ \overline{Nu}/\overline{Nu_{\mathrm{s}}} $ of outer area

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图 8 内部$ \overline {Nu}/\overline {{Nu}_{{\mathrm{s}}}} $随转速变化

Figure 8. $ \overline {Nu}/\overline {{Nu}_{{\mathrm{s}}}} $ in inner area with different speed

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图 9 外部区域$ \overline {Nu}/\overline {{Nu}_{{\mathrm{s}}}} $随转速变化

Figure 9. Variation of $ \overline {Nu}/\overline {{Nu}_{{\mathrm{s}}}} $ in external region with speed

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图 10 $ \overline {Nu} $随雷诺数变化

Figure 10. Variation of $ \overline {Nu} $ with Reynolds number

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表 1 实验参数范围

Table 1. Experimental parameters

参数	范围
雷诺数Re	10000～80000
旋转数R_rotating	0～0.7
温比	0.14
方位角β/（°）	90
水力直径D/mm	14.1
无量纲位置X/D_h	3.97 （PL1/PT1） 5.04 （PL2/PT2） 6.10 （PL3/PT3/ PL6/PT6） 7.16 （PL4/PT4/ PL7/PT7） 8.23 （PL5/PT5/ PL8/PT8）
转静比r/D_h	19.5
背压/MPa	0.5

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参考文献(24)

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