低压自然循环系统自然循环能力限特性分析

摘要

基于一维四方程两相漂移流模型,采用数值计算的方法对低压自然循环系统在不同的加热段入口欠热度及不同系统压力情况下的自然循环能力特性进行了研究.结果表明,当系统运行压力为1.5 MPa时,选定自然循环系统加热段入口欠热度,总存在某一加热热流密度使得系统的自然循环流速最高；不同的系统运行压力对自然循环系统的自然循环能力有明显的影响.%This paper based on the one-dimension two-phase drift flow model, adopt numerical calculation, the research of natural circulation capability behaviors were performed with low pressure natural circulation system ( NCS) in different subcooling of the entrance fluid at heated section and different system pressure. The results show that when system runs in 1. 5 Mpa.with a special subcooling of the entrance fluid of NCS, always exist a heat flux maximize the system natural circulation speed. Different running pressure has a visible influence with the natural circulation capability of NCS.