冲击+扰流柱双层壁冷却结构的强化换热性能及流阻特性

韦宏; 祖迎庆

doi:10.13224/j.cnki.jasp.20220489

冲击+扰流柱双层壁冷却结构的强化换热性能及流阻特性

doi: 10.13224/j.cnki.jasp.20220489

韦宏^1,,
祖迎庆^2,*, ,

1.
安徽工程大学机械工程学院，安徽芜湖 241000
2.
复旦大学航空航天系，上海 200433

基金项目: 上海市自然科学基金（19ZR1402500）；上海市商用航空发动机领域联合创新计划（AR908，AR960）

详细信息

作者简介:
韦宏（1988-），男，讲师，博士，主要从事航空发动机热端部件冷却技术方面的研究。E-mail：weih16@fudan.edu.cn

通讯作者:
祖迎庆（1978-），男，副研究员、博士生导师，博士，主要从事航空发动机气动热力学方面的研究。E-mail: yzu@fudan.edu.cn

中图分类号: V231.1
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出版历程
- 收稿日期: 2022-07-06
- 网络出版日期: 2023-11-29

Enhanced heat transfer performance and flow resistance characteristics of the double-wall cooling structures with jet impingement and pin fins

WEI Hong^1
,,
ZU Yingqing^{2,*
, ,}

1.
School of Mechanical Engineering，Anhui Polytechnic University，Wuhu Anhui 241000，China
2.
Department of Aeronautics and Astronautics，Fudan University，Shanghai 200433，China

摘要

摘要:
对于冲击+扰流柱的双层壁冷却结构，为了研究冲击孔的无量纲排间距和无量纲孔间距、扰流柱的无量纲直径以及冲击射流雷诺数对其强化换热性能以及其流阻特性的影响，基于多种几何参数和流动参数对冲击+扰流柱的双层壁冷却结构进行了实验研究，并根据实验工况开展了相应的数值模拟。结果表明：在带有扰流柱的整个冲击靶板内表面上，面平均努塞尔数随着射流雷诺数的增大而单调增大，且基本上呈现为线性增长的趋势。总体而言，在扰流柱表面的面平均努塞尔数略高于冲击靶板内壁面的面平均努塞尔数。随着扰流柱的无量纲直径的增大，在双层壁冷却结构的整个内表面的面平均努塞尔数呈现为先下降后增大的趋势。此外，在整个内表面的面平均努塞尔数随着冲击孔的无量纲排间距的增大而减小；但是，面平均努塞尔数对无量纲孔间距变化的响应不敏感。对于冲击+扰流柱双层壁冷却结构的流量系数，它随着射流雷诺数以及冲击孔的无量纲排间距和无量纲孔间距的增大而增大，但是随着扰流柱的无量纲直径的增大而减小。
- 双层壁冷却结构 /
- 冲击射流 /
- 扰流柱 /
- 强化换热 /
- 努塞尔数 /
- 流量系数
Abstract:
For the double-wall cooling structure with jet impingement holes and pin fins, in order to study the influences of non-dimansional row spacing and dimensionless hole pitch of the jet impingement holes, the dimensionless diameter of pin fins and the jet impingement Reynolds number on the enhanced heat transfer performance and flow resistance characteristics, experimental studies were conducted based on various geometrical and flow parameters in present study. In addition, the corresponding numerical simulations were also carried out according to the experimental conditions. The results showed that on the whole internal wall surface of the jet impingement target plate with pin fins, the area-averaged Nusselt number monotonically increased with the increase of the jet impingement Reynolds number, and basically presented a linearly increasing tendency. In general, the area-averaged Nusselt number of the wall surface of pin fins was slightly higher than that on the internal wall surface of the jet impingement target plate. With the increase of dimensionless diameter of pin fins, the area-averaged Nusselt number of the entire internal wall surface of the double-wall cooling structure decreased firstly and then increased. In addition, the area-averaged Nusselt number of the entire internal wall surface decreased with the increase of non-dimensionla row spacing. However, the area-averaged Nusselt number of the entire internal wall surface was not sensitive to the variation of non-dimensional hole pitch. The discharge coefficient of the double-wall cooling structure with jet impingement holes and pin fins increased with the increase of the jet impingement Reynolds number, the dimensionless row spacing and non-dimansional hole pitch of jet impingement holes, but decreased with the increase of dimensionless diameter of pin fins.
- double-wall cooling structure /
- jet impingement /
- pin fins /
- enhanced heat transfer /
- Nusselt number /
- discharge coefficient

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图 1 冲击+扰流柱双层壁冷却结构的实验系统示意图

Figure 1. Schematic diagram of experimental system of double-wall cooling structure with jet impingement holes and pin fins

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图 2 冲击+扰流柱双层壁冷却结构强化换热的实验件

Figure 2. Test piece of strengthen heat transfer of double-wall cooling structure with jet impingement holes and pin fins

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图 3 冲击+扰流柱双层壁冷却结构的冲击靶板实物图

Figure 3. Physical drawing of the jet impingement target plate of the double-wall cooling structure with jet impingement holes and pin fins

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图 4 T型热电偶和扰流柱的相对布置位置（单位：mm）

Figure 4. Relative positions of the T-type thermocouples and pin fins （unit: mm）

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图 5 T型热电偶实时采集的温度数据曲线（X/D=3、Y/D=3、D_p/D=1、Re=17500）

Figure 5. Real-time temperature data curves collected by T-type thermocouples （X/D=3, Y/D=3, D_p/D=1, Re=17500）

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图 6 面平均努塞尔数$ \overline{\overline{Nu}} $随着射流雷诺数Re的变化情况

Figure 6. Variation of area-averaged Nusselt number $ \overline{\overline{Nu}} $ with the jet Reynolds number Re

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图 7 双层壁冷却结构的计算域和边界条件的设置

Figure 7. Computational domain and boundary conditions setting of the double-wall cooling structure

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图 8 双层壁冷却结构的计算域及其网格划分

Figure 8. Computational domain and grid generation of the double-wall cooling structure

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图 9 强化换热结构的网格无关性分析

Figure 9. Grid independence analysis of the enhanced heat transfer structure

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图 10 面平均努塞尔数$ \overline{\overline{Nu}} $的数值结果与实验结果的对比

Figure 10. Comparisons between numerical results and experimental results of the areal averaged Nusselt number $ \overline{\overline{Nu}} $

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图 11 冲击靶板内侧壁面和扰流柱表面的努塞尔数Nu 的分布云图（X/D=3, Y/D=4）

Figure 11. Distributions of Nusselt number Nu on the internal wall surface of jet impingement target plate and pin fins （X/D=3, Y/D=4）

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图 12 扰流柱表面与冲击靶板内侧壁面的$\overline{ \overline{Nu} }$ 的对比

Figure 12. Comparison of $\overline{ \overline{Nu} }$ between the wall surface of pin fins and the internal wall surface of jet impingement target plate

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图 13 各个实验工况下冲击孔板的流量系数分布

Figure 13. Distribution of discharge coefficient of the jet impingement plate under various experimental conditions

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表 1 各个独立变量的相对误差

Table 1. Relative error of each independent variable

参数X_i	$ \left(\dfrac{\partial Nu}{\partial {X}_{i}}\cdot \dfrac{{\text{δ}} {X}_{i}}{Nu}\right)\Bigg/$%
热通量（q）	±0.70
冲击孔直径（D）	±2.0
冷气射流温度（t_c）	±0.75
靶板壁面温度（t_w）	±2.50

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表 2 实验件的几何参数

Table 2. Geometrical parameters of the test pieces

冲击孔直径 D/mm	冲击距离 H/D	冲击孔的排间距 X/D	冲击孔的孔间距 Y/D	扰流柱的直径 D_p/D	冲击孔和扰流柱的排布方式及排布示意图
5	1	3	4	1
		4	4	1
		5	4	1
		3	3	1
		3	5	1
		3	4	2

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