基于CFD计算的核电厂半管水位运行工况余排接管入口涡流吸气效应研究

CFD simulation on Vortex and air-ingestion phenomenon at the junction of residual heat removal system(RHR) during mid-loop operation at nuclear power plant

核电厂半管水位运行工况期间,余热排出系统与主管道连接的管道入口可能发生涡流吸气现象导致气体进入余排管道,影响余排泵的效率甚至造成余排泵气蚀损坏,进而导致余热导出能力失效。本文基于成熟的核电厂余排管道入口结构设计,采用CFD的方法对不同形式的余排管道入口流动情况进行模拟仿真计算分析,并对半管水位、余排流量等关键参数进行了对比分析,一定程度上为余排接管入口防涡流吸气的设计提供了理论指导。

Vortex and air-ingestion phenomenon may happen at junction of residual heat removal system （RHR） and primary pipe during mid-loop operation at nuclear power plant. Vortex and air-ingestion phenomenon leading to gas go inside RHR pipe can influence the efficiency of RHR pump, even damage the pump by cavitation and result in ability of removing heat of reactor lose finally. CFD were used to simulate fluid field at the junction, and analyse the parameter of fluid field such as level of mid-loop and flow rate. This article is base on mature design of structural of RHR junction, and it can help to design of preventing Air-ingestion phenomenon.