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一、前言 自然循环在各工业部门都有广泛的应用,对于水-水反应堆更有其重要意义。首先它是保证事故后冷却的重要手段,其次它可以用作主要循环方式,大大简化系统,减少系统对外界电源的依赖性,提高安全性。自然循环所能达到的功率水平对于它的采用十分重要,流动不稳定性则是限制其功率的因素之一。对于在压水堆单相液体自然循环系统中发生的流量脉动有所报导,但研究不多。本文利用制冷剂R-12进一步研究了带有不加热上升段的单相液体自然循环系统中的流动不稳定性问题。
I. INTRODUCTION The natural cycle has a wide range of applications in various industrial sectors and is more important to water-water reactors. First of all, it is an important means of ensuring cooling after an accident. Second, it can be used as the main circulation mode, greatly simplifying the system, reducing the system’s dependence on external power sources, and improving safety. The level of power that a natural cycle can achieve is important to its adoption, and flow instability is one of the factors that limit its power. There have been reports on the flow pulsations that occur in a natural circulation system of PWR single-phase liquid, but few studies have been done. In this paper, refrigerant R-12 was used to further investigate the flow instability in a single-phase liquid natural circulation system with an unheated rising section.