多层环形流道阻塞事故三维数值分析初步探索  

Preliminary 3D Numerical Study on Flow Blockage Accident in Multi-layer Annular Flow Channels

作　　者：樊文远[1] 郭赟[1] 彭常宏[1] 

机构地区：[1]中国科学技术大学核科学技术学院,合肥230026

出　　处：《核动力工程》2016年第1期123-128,共6页Nuclear Power Engineering

基　　金：中国核动力研究设计院核反应堆系统设计技术重点实验室基金项目(HT-CENT-02-2014001)

摘　　要：由环形燃料板组成的多层环形燃料组件容易发生流道阻塞事故,对流道阻塞情况下的流动与换热特性进行研究非常有必要。本文对多层环形流道阻塞事故在进行三维数值分析研究中的基础问题进行探讨,验证尺度化壁面函数在流量持续降低工况下的适用性。对流道入口发生90%堵塞的工况,分别运用速度入口与压力入口的边界条件进行计算,证明压力入口是流道阻塞事故计算流体动力学(CFD)研究保守、可信的边界条件。对堵塞工况进行瞬态与稳态计算,分析流量与功率的再分配。The multi-layer annular fuel assembly, which is consisted of annular-type fuel plates, is easily blocked. It is necessary to study the flow and heat transfer behavior of the assembly under flow blockage condition. In this study, basic problems in three-dimensional investigation on flow blockage accident in multi-layer annular channels are discussed. Scalable wall functions are proved to be suitable to simulate flow-rate-decaying cases. A 90% inlet flow blockage case is then calculated using velocity-inlet and pressure-inlet respectively, and the pressure-inlet is proved to be the proper boundary condition for CFD simulations on flow blockages. Both transient and steady simulations are done, and flow and heat transfer redistributions caused by the blockage are analyzed.

关 键 词：流道阻塞 多层环形流道 CFD 尺度化壁面函数 压力入口 

分 类 号：TL33[核科学技术—核技术及应用]