Effect of main/branch pipe temperature difference on turbulent intrusion phenomenon in downward stagnation pipelines of nuclear power systems

XU Honghan; MIN Guangyun; JIANG Naibin

doi:10.13471/j.cnki.acta.snus.ZR20250035

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Effect of main/branch pipe temperature difference on turbulent intrusion phenomenon in downward stagnation pipelines of nuclear power systems

Research articles | 更新时间：2025-11-14

- Effect of main/branch pipe temperature difference on turbulent intrusion phenomenon in downward stagnation pipelines of nuclear power systems
- Acta Scientiarum Naturalium Universitatis Sunyatseni Vol. 64, Issue 4, Pages: 53-61(2025)
- 作者机构：
  
  中山大学中法核工程与技术学院，广东珠海 519082
- 作者简介：
- 基金信息：
- DOI：10.13471/j.cnki.acta.snus.ZR20250035
  CLC： TL353
- Received：22 February 2025，
  
  Accepted：24 March 2025，
  
  Published Online：16 June 2025，
  
  Published：25 July 2025
- 稿件说明：
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许洪瀚,闵光云,姜乃斌.主支管温差对核电下行滞止管道中湍流入侵现象的影响[J].中山大学学报(自然科学版)(中英文),2025,64(04):53-61.

XU Honghan,MIN Guangyun,JIANG Naibin.Effect of main/branch pipe temperature difference on turbulent intrusion phenomenon in downward stagnation pipelines of nuclear power systems[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2025,64(04):53-61.
许洪瀚,闵光云,姜乃斌.主支管温差对核电下行滞止管道中湍流入侵现象的影响[J].中山大学学报(自然科学版)(中英文),2025,64(04):53-61. DOI： 10.13471/j.cnki.acta.snus.ZR20250035.

XU Honghan,MIN Guangyun,JIANG Naibin.Effect of main/branch pipe temperature difference on turbulent intrusion phenomenon in downward stagnation pipelines of nuclear power systems[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2025,64(04):53-61. DOI： 10.13471/j.cnki.acta.snus.ZR20250035.

摘要

针对冷热流体交汇的下行滞止管路系统，采用高精度结构化网格划分技术构建三维管系模型，通过大涡模拟（LES）湍流模型研究了主支管温差对三通附近湍流入侵现象的影响机制。研究发现：支管入口区呈现显著的温度振荡特性，且湍流入侵深度与主支管温差呈正相关；弯管段温度振荡和流体流速均远小于三通处，证实了湍流入侵的剧烈程度受入侵深度的抑制作用；支管上游近壁区存在明显的涡脱落现象，涡量输运与温度脉动场在空间分布上呈现强耦合特征。

Abstract

For the downward stagnation pipeline system where cold and hot fluids converge， a three-dimensional pipeline system model was constructed using high-precision structured grid meshing technology.The influence mechanism of main-branch pipe temperature difference on turbulent intrusion phenomena near the tee junction was systematically investigated through the large eddy simulation（LES） turbulence model.The study revealed：The branch pipe inlet region exhibited significant temperature oscillation characteristics， with turbulent intrusion depth showing positive correlation with main-branch pipe temperature difference； Both temperature oscillations and fluid flow velocities in the bend section were significantly lower than those at the tee junction， confirming that the intensity of turbulent intrusion is suppressed by the intrusion depth； Distinct vortex shedding phenomena were observed in the near-wall region upstream of the branch pipe， where vortex transport and temperature fluctuation fields exhibited strong coupling characteristics in spatial distribution.

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references

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