压水堆主回路失水事故下水锤与管道结构的相互作用分析

Analysis of Waterhammer-structure Interaction in Piping System for a Loss of Coolant Accident in Primary Loop of Pressurized Water Reactor

传统的水锤分析和管道动力响应计算是分开的 ,存在一定的缺陷。本文针对核电站主回路假想双端断裂时系统的受力和力矩分析这一问题 ,对破裂管道分析了流体和管道的耦合机制 ,引入描述流体 管道单元的 14个参数和 14个偏微分方程 ,利用特征线法对水锤和管道结构的相互耦合作用进行了模拟计算。计算得到了更为准确的水锤波和管道的受力和力矩 ,其波形和数值均与不考虑耦合作用时有所不同。这些计算结果为压水堆核电站的核安全设计和分析提供了有益参考。

The conventional analysis of waterhammer and dynamics response of structure in piping system is divided into two parts, and the interaction between them is neglected. In this paper, the mechanism of fluid structure interaction under the double end break pipe in piping system is analyzed. Using the characteristics method, the numerical simulation of waterhammer structure interaction in piping system is completed based on 14 parameters and 14 partial differential equations of fluid piping cell. The calculated results for a loss of coolant accident(LOCA) in primary loop of pressurized water reactor show that the waveform and values of pressure and force with time in piping system are different from that of non interaction between waterhammer and structure in piping system, and the former is less than the later.