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为探讨两相流及流动稳定性理论及工程问题 ,通过实验研究描述了自然循环静态流量漂移及静态流量漂移过程中出现的动态流量振荡现象 ;研究了在自然循环系统中流量发生漂移时系统循环流量 ,加热段进出口温度的变化规律。结果表明 :欠热沸腾所引起的流动阻力变化是导致静态流量漂移的主要原因 ;在发生静态流量漂移时系统循环流量下降 ,进口温度下降及出口温度上升 ;随着静态流量漂移的发展 ,欠热沸腾逐渐强烈 ,伴随着静态流量漂移系统内同时发生具有密度波及喷泉不稳定特点的动态流量振荡。在对现象描述的基础上 ,阐述了静态及动态流量不稳定发生的机理。研究结果证明 :在自然循环中静态流量漂移将会诱发动态流量振荡
In order to study the theory and engineering problems of two-phase flow and flow stability, the dynamic flow oscillations that occur during natural circulation static flow drift and static flow drift are described through experimental studies. The system circulation is studied when the flow rate is drifting in a natural circulation system Flow, heating section import and export temperature changes. The results show that the change of flow resistance caused by underheated boiling is the main reason leading to the static flow drift. When the static flow drift occurs, the system circulation flow rate decreases, the inlet temperature decreases and the outlet temperature increases. With the development of static flow drift, Boiling is intense, with dynamic flow oscillations that occur at the same time in a system that has a density that affects the instability of the fountain, along with static flow drift. Based on the phenomenon description, the mechanism of static and dynamic flow instability is expounded. The results of the study demonstrate that static flow drift in natural circulation will induce dynamic flow oscillations