浮升力对竖直螺旋管中超临界CO<sub>2</sub>换热的影响及判别准则

王彦红; 陆英楠; 李洪伟; 李素芬; 东明

doi:10.13700/j.bh.1001-5965.2022.0024

浮升力对竖直螺旋管中超临界CO₂换热的影响及判别准则

doi: 10.13700/j.bh.1001-5965.2022.0024

1.
东北电力大学能源与动力工程学院，吉林 132012
2.
大连理工大学能源与动力学院，大连 116024

基金项目: 国家自然科学基金(51576027)；吉林省教育厅科研项目(JJKH20220100KJ)；东北电力大学青年博士科研助推计划(BSZT02202102)

详细信息

通讯作者:
E-mail：lihongwei@neepu.edu.cn

中图分类号: V233.5
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出版历程
- 收稿日期: 2022-01-17
- 录用日期: 2022-05-01
- 网络出版日期: 2022-06-09
- 整期出版日期: 2023-11-30

Influence and criterion of buoyancy force on heat transfer of supercritical CO₂ in a vertical helical tube

1.
School of Energy and Power Engineering，Northeast Electric Power University，Jilin 132012，China
2.
School of Energy and Power Engineering，Dalian University of Technology，Dalian 116024，China

Funds: National Natural Science Foundation of China (51576027)；Scientific Research Project of Jilin Provincial Education Department (JJKH20220100KJ); Young Doctoral Research Project of Northeast Electric Power University (BSZT02202102)

More Information

Corresponding author: E-mail：lihongwei@neepu.edu.cn

摘要

摘要:
基于航空发动机间冷器的冷却换热问题，进行竖直螺旋管内超临界压力CO₂换热数值研究。探究运行参数对沿流向和周向换热的影响机制。通过管截面温度场和流场分布阐述了浮升力和离心力引起的周向非均匀换热机制，评估二次流速度和强度。根据管道结构特性提出新的浮升力参数和浮升力影响判别准则，建立新的换热关联式。结果表明：管上游非均匀换热源于浮升力与离心力综合作用，管下游非均匀换热由离心力主导。当满足浮升力因子B_u≥1.6×10⁻⁵时，浮升力在换热中起主导作用。新换热关联式可以较好地适用于螺旋管内换热预测。
- 螺旋管 /
- 超临界 /
- 换热 /
- 离心力 /
- 浮升力 /
- 判别准则
Abstract:
Numerical research was done on the heat transmission of supercritical CO₂ in a vertical helical tube based on the cooling heat transfer in the aeroengine intercooler. The influence mechanisms of the operating parameters on heat transfer along the flow and circumferential directions were investigated. The distributions of the temperature field and flow field in tube cross-sections were used to describe the circumferential non-uniform heat transmission mechanism generated by the buoyancy force and centrifugal force. The secondary flow velocity and intensity were analyzed. According to the tube structure characteristics, the reasonable buoyancy parameter and buoyancy criteria were proposed, and the new heat transfer correlation was obtained. The results show that the centrifugal force predominates in the tube downstream while the buoyancy force and centrifugal force combine to provide non-uniform heat transfer in the tube upstream. When the buoyancy factor B_u≥1.6×10⁻⁵ is satisfied, the buoyancy force plays a leading role in heat transfer. The new heat transfer correlation can better predict the heat transfer in the helical tube.
- helical tube /
- supercritical /
- heat transfer /
- centrifugal force /
- buoyancy force /
- criterion

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图 1 竖直螺旋管示意图

Figure 1. Diagram of vertical helical tube

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图 2 二氧化碳ρ和c_p随温度的变化

Figure 2. Variations of carbon dioxide ρ and c_p with temperature

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图 3 T_out和u_out随网格数的变化

Figure 3. T_out and u_out variations with number of meshes

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图 4 螺旋管网格

Figure 4. Mesh of helical tube

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图 5 T_wi和T_b随l/d_i的变化

Figure 5. T_wi and T_b variations with l/d_i

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图 6 不同工况下T_wi,av和h_av随l/d_i的变化

Figure 6. T_wi,av and h_av variations with l/d_i at different conditions

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图 7 不同周向位置T_wi和h随l/d_i的变化

Figure 7. T_wi and h variations with l/d_i at different circumferential positions

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图 8 P₁位置管截面温度、二次流速度、局部质量流速和湍动能的分布情况

Figure 8. Temperature, secondary flow velocity, local mass flux and turbulent kinetic energy distributions at position of P₁ cross-section

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图 9 P₂位置管截面温度、二次流速度、局部质量流速和湍动能的分布情况

Figure 9. Temperature, secondary flow velocity, local mass flux and turbulent kinetic energy distributions at position P₂ cross-section

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图 10 不同工况下h的周向分布情况

Figure 10. h circumferential distributions at different conditions

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图 11 不同工况下Se随l/d_i的变化

Figure 11. Se variations with l/d_i at different conditions

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图 12 B_u随R_i^*的变化

Figure 12. B_u variations with R_i^*

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图 13 不同工况下∆T_wi和B_u随l/d_i的分布

Figure 13. ∆T_wi and B_u distributions with l/d_i at different conditions

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图 14 Nu计算结果和数值数据的比较

Figure 14. Comparison of Nu between calculated results and numerical data

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图 15 Nu计算结果和实验数据的比较

Figure 15. Comparison of Nu between calculated results and experimental data

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