Study of Jet Interface Instability During Steam Generator Tube Rupture Accidents in Lead-Cooled Fast Reactors

MIAO Fan; ZHANG Bin; CAO Sheng; ZHOU Haohao; SHAN Jianqiang

doi:10.7652/xjtuxb202606020

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Study of Jet Interface Instability During Steam Generator Tube Rupture Accidents in Lead-Cooled Fast Reactors

更新时间：2026-06-12

- Study of Jet Interface Instability During Steam Generator Tube Rupture Accidents in Lead-Cooled Fast Reactors
- Journal of Xi'an Jiaotong University Vol. 60, Issue 6, Pages: 234-244(2026)
- 作者机构：
  
  西安交通大学能源与动力工程学院，710049，西安
  西安交通大学绿色氢电全国重点实验室，710049，西安
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202606020
  CLC： O358
- Received：11 November 2025，
  
  Published：10 June 2026
- 稿件说明：
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MIAO Fan, ZHANG Bin, CAO Sheng, et al. Study of Jet Interface Instability During Steam Generator Tube Rupture Accidents in Lead-Cooled Fast Reactors[J]. Journal of Xi'an Jiaotong University, 2026, 60(6): 234-244.
DOI：

MIAO Fan, ZHANG Bin, CAO Sheng, et al. Study of Jet Interface Instability During Steam Generator Tube Rupture Accidents in Lead-Cooled Fast Reactors[J]. Journal of Xi'an Jiaotong University, 2026, 60(6): 234-244. DOI： 10.7652/xjtuxb202606020.

摘要

针对铅冷快堆蒸汽发生器传热管破裂（SGTR）事故下，冷却剂-冷却剂相互作用过程中，水-水蒸气-铅/铅铋三相射流的破碎现象，开展了三相系统开尔文-亥姆霍兹不稳定性研究。基于柱坐标系下的三相射流物理模型，对界面微扰进行了线性稳定性分析，推导了系统的无量纲色散方程，并研究了半径比、韦伯数、密度比、速度比等无量纲量对射流破碎行为的影响。研究结果表明：在满足厚蒸汽膜近似时，内外侧界面耦合效应减弱，三相不稳定性发生分离，此时，内侧水-水蒸气界面主导为射流破碎行为；在韦伯数低于0.1的条件下，射流长度随韦伯数的增加而增加，液滴直径基本不变；在韦伯数高于10的条件下，两者均随韦伯数的增加而减小；当密度比增加时，射流长度随之增加而液滴直径基本不变；当速度比增加时，射流长度和液滴直径均先随之增加后减小。模型对最不稳定波长的预测与实验符合较好。该研究结果为SGTR事故中射流破碎行为的机理分析及后续安全评估提供了理论基础。

Abstract

To investigate the breakup behavior of water-steam-lead/LBE three-phase jets that occur during coolant-coolant interaction in a steam generator tube rupture（SGTR）accident of a lead-cooled fast reactor，a study was carried out on Kelvin-Helmholtz instability of the threephase system.Based on a physical model for three-phase jets in cylindrical coordinates，a linear stability analysis on interface perturbations was performed，and a dimensionless dispersion equation for the system was derived.Moreover，the influences of dimensionless parameters，including radius ratio，Weber number，density ratio，and velocity ratio，on the breakup behavior of jets were explored.The study results showed that，under the thick-vapor-film approximation，coupling between the inner and outer interfaces was weakened and the three-phase instability became decoupled.In this case，the breakup behavior of jets is dominated by the inner watersteam interface.For Weber numbers below 0.1，the jet length increased with increasing Weber number while the droplet diameter remained essentially unchanged.For Weber numbers above 10，both jet length and droplet diameter decreased with increasing Weber number.As the density ratio increased，the jet length increased while the droplet diameter remained nearly constant. With increasing velocity ratio，both jet length and droplet diameter increased initially and then decreased.The model’s predictions for the most unstable wavelength showed good agreement with experimental data. The study results are expected to provide a theoretical basis for mechanistic analysis of breakup behavior of jets and for subsequent safety assessment during SGTR accidents.

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