Nuclear Techniques ›› 2020, Vol. 43 ›› Issue (1): 10603-010603.doi: 10.11889/j.0253-3219.2020.hjs.43.010603

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Numerical simulation of CCFL phenomenon based on modified AIAD model

Boyang LI Dong YANG Yihao ZHANG Yongqi ZHAO   

  1. School of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
  • Received:2019-10-21 Revised:2019-11-28 Online:2020-01-15 Published:2020-01-21
  • Supported by:
    Shanghai Youth Science and Technology Talents Sailing Program(19YF1416800)

Abstract: Background

Passive automatic pressure relief system is widely used in the third generation nuclear power technology to improve the safety of the reactor. However, the counter-current flow limitation (CCFL) which may be caused by a rupture accident will increase the safety risk of the pressurizer surge line itself. Therefore, it is very important to study the CCFL phenomenon in the pressurizer surge line.

Purpose

This study aims at numerical simulation of the phenomenon of CCFL in the pressurizer surge line.

Methods

The free surface model and modified algebraic interfacial area density (AIAD) model were used to simulate the CCFL phenomenon by ANSYS CFX software. By comparison with corresponding experimental phenomena, the model used for the simulation of the interphase action of the two phases under this phenomenon was evaluated.

Results

Results of the sensitivity analysis of the gas phase velocity and inclined angle show that the advance of the slug is mainly affected by the initial gas phase velocity and the surge line inclination angle of the pressurizer. The position near the initial gas phase velocity of the surge line is mainly affected by the initial gas phase velocity, while the position away from the pipeline initial point is mainly affected by the inclined angle.

Conclusions

The CCFL phenomenon can be clearly reflected by using free surface model and modified AIAD models which is consistent with the experimental results.

Key words: CCFL phenomenon, Pressurizer surge line, Modified algebraic interfacial area density model

CLC Number: 

  • TL334