原子能科学技术 ›› 2017, Vol. 51 ›› Issue (8): 1387-1392.DOI: 10.7538/yzk.2017.51.08.1387

• 反应堆工程 • 上一篇    下一篇

高压安注条件下冷管段和环腔流体混合特性的数值分析

韩旭1;熊进标1;程旭1;王宁2   

  1. 1.上海交通大学 核科学与工程学院, 上海200240;2.中国核动力研究设计院 信息中心,四川 成都610213
  • 出版日期:2017-08-20 发布日期:2017-08-20

Numerical Analysis of Fluid Mixing Characteristics in Cold Leg and Downcomer under High Pressure Safety Injection

HAN Xu1;XIONG Jin-biao1;CHENG Xu1;WANG Ning2   

  1. 1.School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2.Information Center, Nuclear Power Institute of China, Chengdu 610213, China
  • Online:2017-08-20 Published:2017-08-20

摘要:

压水堆高压安注条件下冷热流体混合会导致承压热冲击现象,影响压力容器的使用寿命。本文基于ROCOM实验装置的实验数据,使用CFD方法对高压安注条件下有密度差的冷热流体混合现象进行了模拟,并对模拟结果进行了验证与分析。结果表明,在冷管段和下降段环腔中流体混合的主导因素分别为强迫流动混合和浮升力驱动混合。在仅有1条冷管段注入的情况下,进入下腔室的流体会再次回流至环腔,从而对冷却剂的混合特性产生影响。

关键词: 高压安注, 混合特性, 热分层, 承压热冲击

Abstract:

Mixing of hot and cool coolants during high pressure safety injection in pressurized water reactors (PWRs) can lead to pressurized thermal shock, which results in aging of the pressure vessel. Based on the ROCOM experimental database, the mixing of hot and cool coolants with density difference was numerically simulated by using CFD method, and the simulation results were validated and analyzed. The results show that the force convection mixing and buoyancy-driving mixing are main reason for mixing of liquid in cold leg and downcomer. During coolant injection from one of the loops, the injected flow could product backflow from the lower plenum to the downcomer, which can affect the mixing characteristics of coolant.

Key words: high pressure safety injection, mixing characteristic, thermal stratification, pressurized thermal shock