压水堆自然循环比例模化基本方程及相似准则数的研究

Investigation on Basic Equations and Scaling Criteria of PWR Natural Circulation

在分析压水堆自然循环特性基础上,以漂移流模型作为两相流模型,从独立的单相和两相方程出发,通过无量纲化处理,获得一组相同的无量纲化方程组,从而获得能够适用于单相和两相的相似准则数。同时,对自然循环现象模拟的本质以及准则数的物理含义进行了分析说明,并就模拟初始数值的选择,流动不稳定性模拟、传热及临界热流密度模拟等方面进行了分析。

With analyzing the characteristic of PWR natural circulation, a set of non-dimensional equations were obtained to describe natural circulation phenomenon for both single phase and two-phase independently from single and two phase one dimensional equations. Thus, a set of scaling criteria deduced from non-dimensional equations is able to be applied to scaling simulation for both single and two phase natural circulation. Then, the essence of scaling simulation of natural circulation and the physical meaning of criteria were discussed with initial parameters of simulation, flow instability simulation, heat transfer and critical heat transfer simulation.