基于多级设计概念的肋化内冷通道流动换热特性

刘国庆; 郑少飞; 杨燕茹; 李海旺; 王晓东

doi:10.13224/j.cnki.jasp.20220861

基于多级设计概念的肋化内冷通道流动换热特性

doi: 10.13224/j.cnki.jasp.20220861

刘国庆^{1, 2,},
郑少飞^{1, 2,*, ,},
杨燕茹^{1, 2},
李海旺³,
王晓东^{1, 2}

1.
华北电力大学新能源电力系统国家重点实验室，北京 102206
2.
华北电力大学工程热物理研究中心，北京 102206
3.
北京航空航天大学能源与动力工程学院，北京 100191

基金项目: 航空发动机及燃气轮机基础科学中心项目（P2022-B-Ⅱ-029-001）；国家自然科学基金（52006064）

详细信息

作者简介:
刘国庆（1997-），男，硕士生，主要从事涡轮叶片内冷通道流动与换热研究。E-mail：XTU18390210192@outlook.com

通讯作者:
郑少飞（1990-），男，讲师，博士，主要从事强化换热与冷却技术研究。E-mail：shaofeizheng@ncepu.edu.cn

中图分类号: V231.1
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出版历程
- 收稿日期: 2022-11-13
- 网络出版日期: 2024-03-20

Fluid flow and heat transfer of ribbed channel based on the hierarchical design concept

LIU Guoqing^{1, 2
,},
ZHENG Shaofei^{1, 2,*
, ,},
YANG Yanru^{1, 2},
LI Haiwang³,
WANG Xiaodong^{1, 2}

1.
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources，North China Electric Power University，Beijing 102206，China
2.
Research Center of Engineering Thermophysics，North China Electric Power University，Beijing 102206，China
3.
School of Energy and Power Engineering，Beihang University，Beijing 100191，China

摘要

摘要:
利用数值仿真方法，研究了4种肋片构型（直肋、斜肋、V肋和反V肋）和两种设计方法（均匀设计和多级设计）下肋化通道的流动换热特性，进一步明确多级设计概念的有效性和适用性。结果表明：采用多级设计后，4种肋片构型的换热性能均有不同程度的下降，其中直肋降幅最小（低于3.00%），斜肋降幅最大（达到12.76%）；流动阻力展现出标志性的下降，其中直肋减阻效果最差，摩擦因子降低36.15%～37.67%，反V肋实现最佳的减阻效果，摩擦因子降低46.98%～50.32%；最终，多级设计有效地增强了肋化通道综合冷却效果，在雷诺数为100000时，与现有均匀设计相比，基于多级设计的反V肋综合性能因子（Nu/Nu₀）/（f/f₀）提高81.29%。分析表明，沿着流动方向线性减少的肋片尺寸，一方面有效地抑制二次流动，另一方面促使主流产生下压效应，强化壁面流体冲击效果，进而在轻微损失换热性能的基础上，实现标志性的减阻效果。
- 涡轮叶片内部冷却 /
- 多级设计概念 /
- 换热性能 /
- 流动阻力 /
- 综合性能
Abstract:
Using the numerical simulation, the fluid flow and heat transfer characteristics of a ribbed channel considering four rib configurations (transverse ribs, inclined ribs, V-shaped ribs, and inverse V-shaped ribs) and two designs (uniform design and hierarchical design) were studied for verifying the effectiveness of the hierarchical design concept. The results demonstrated that using the hierarchical design, the heat transfer performances of four kinds of ribs slightly decreased, the transverse rib had a minimum reduction below than 3.00%, while the inclined rib presented a maximum reduction up to 12.76%; the flow resistance was significantly reduced, the transverse rib had a minimum reduction with the decreased friction factor by 36.15%—37.67%, the inverse V-shaped rib had a maximum reduction with the decreased friction factor by 46.98%—50.32%; as a result, the hierarchical design effectively improved the overall cooling performance of the ribbed channel with a reduction of 81.29% for the inverse V-shaped rib at Reynolds number of 100000. The slight reduction of the heat transfer performance and the marked resistance reduction came from the combination of the constrained secondary flows and the lowering effect of the mainstream.
- internal cooling of turbine blade /
- hierarchical design concept /
- heat transfer /
- pressure loss /
- overall thermal performance

HTML

图 1 内冷通道整体模型

Figure 1. Schematic diagram of the internal cooling channel

下载: 全尺寸图片幻灯片

图 2 肋片排布方式示意图

Figure 2. Schematic of the rib arrangement

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图 3 近肋区域网格示意图

Figure 3. Computation grids near ribs

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图 4 在Re=80000时，沿流动方向第3级和第4级肋片间底壁面上局部努塞尔数对比^[20]

Figure 4. Comparison of the local Nu distributions of the bottom wall between row 3 and row 4 along the streamwise direction at Re=80000^[20]

下载: 全尺寸图片幻灯片

图 5 不同Re下肋化通道Nu/Nu₀和f/f₀对比

Figure 5. Nu/Nu₀ and f/f₀ at different Re

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图 6 底部壁面温度云图

Figure 6. Temperature distributions on the bottom wall of the channel

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图 7 底面局部平均Nu

Figure 7. Local averaged Nu on the bottom wall

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图 8 通道流向截面上流线与速度云图

Figure 8. Streamline and velocity contour on the central streamwise plane of the channel

下载: 全尺寸图片幻灯片

图 9 第7级和第8级肋片间通道截面流线与速度云图

Figure 9. Streamline and velocity contour on the transverse section of the channel between row 7 and row 8

下载: 全尺寸图片幻灯片

图 10 底壁面流线与湍动能分布

Figure 10. Distributions of streamlines and turbulent kinetic energy on the bottom wall of the channel

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图 11 综合换热性能

Figure 11. Comprehensive heat transfer performance

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表 1 不同模型设计方案

Table 1. Different configurations of the rib arrangement

模型方案	肋片型式	是否采用多级设计
直肋-均匀	直肋	否
直肋-多级	直肋	是
斜肋-均匀	斜肋	否
斜肋-多级	斜肋	是
V肋-均匀	V形肋	否
V肋-多级	V形肋	是
反V肋-均匀	反V形肋	否
反V肋-多级	反V形肋	是

下载: 导出CSV

表 2 网格无关性验证

Table 2. Mesh independence verification

网格数量/10⁶	Nu	相对偏差/%
1.97	183.53	−33.10
2.68	243.00	−0.52
4.00	243.96	−0.13
5.75	244.26	0

下载: 导出CSV

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