论文部分内容阅读
在5MW核供热反应堆模拟热工水力学实验回路HRTL-5上研究了在低压(P=0.1,0.24MPa)自然循环各种进口过欠热度条件下,单相及两相流流动特性。研究了不同种类的流动不稳定性,如,欠热沸腾不稳定性,欠热沸腾引起的闪蒸不稳定性,纯闪蒸不稳定性,密度波-闪蒸耦合不稳定性及高频流动振荡。研究结果表明:低压自然循环系统在绝大部分进口欠热度条件下,其两相流流动是不稳定的,仅在小进口欠热度条件下可获得稳定的两相流流动;在高进口欠热度条件下,加热段中的欠热沸腾控制流动不稳定,在中进口欠热度条件下,加热段中的欠热沸腾及上升段中的空泡闪蒸控制流动不稳定。
The flow characteristics of single-phase and two-phase flow in HRTL-5 simulating thermal hydraulics experiment loop of 5MW nuclear reactor were studied under various conditions of overheating and under-heating of natural circulation under low pressure (P = 0.1,0.24MPa). Various types of flow instabilities were studied, such as, under-boiling boiling instability, flash instability due to under-boiling, pure flash instability, density wave-flash coupling instability and high frequency flow oscillation. The results show that the flow of two-phase flow is unstable under the condition of under-heating of most imported low-pressure natural circulation system, and the steady two-phase flow can be obtained only under the condition of low inlet underheating. Under the condition, the underheated boiling control flow in the heating section is unstable. Under the condition of under-heating of the inlet section, the underheated boiling in the heating section and the bubble flash control flow in the ascending section are unstable.