新型压水堆自然循环特性计算分析

针对新型压水堆的结构特点，在一维质量、动量和能量守恒方程的基础上，建立了描述其稳态自然循环特性的数学模型．模型对新型压水堆在稳态自然循环过程中可能出现的流动形式和换热状态进行了充分考虑．通过数值迭代求解该模型，对新型压水堆的自然循环特性进行了理论分析．计算结果表明：反应堆自然循环流量随堆芯功率的增加而增加，并且是堆芯功率的指数函数；在不同蒸汽压力下，反应堆的自然循环流量不同，且随蒸汽压力的增加而增加．冷热芯位差越大，反应堆自然循环能力越大．该研究对我国新型压水堆的概念设计提供了重要的理论依据．

Calculation Analysis on the Natural Circulation Characteristics of a New Pressurized Water Reactor

A mathematical model was developed for predicting the steady-state natural circulation characteristics of a new type of pressurized water reactor(PWR) based on the one-dimensional mass,momentum and energy conservation equations.The detailed geometry characteristics of the new PWR as well as the flow patterns and heat transfer conditions were considered in the model.With numerically solving the mathematical model,a theoretical investigation was performed on the steady-state natural circulation characteristics of the new PWR.The preliminary calculation analysis shows that natural circulation mass flow rate is proportional to the exponential function of the power, and the value of the exponent is related to working conditions of the steam generator in secondary side.In addition,the higher elevation difference between the core and the steam generator is favorable to the heat removal capacity of the natural circulation.