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过冷沸腾的出现标志两相非平衡态开始,并有可能导致流动系统进入到第一类(即低含汽率下)不稳定区。本文着重研究了过冷沸腾对低温核供热堆低压自然循环流动稳定性的影响,考察了汽泡脱离点Zd、分布参数C_0、漂移速度系数C_1及其对空泡分布和系统稳定性的影响。结果表明:(1)在大扰动(如事故工况)下,过冷沸腾引起的空泡反应性反馈对系统稳定性影响显著,不同过冷沸腾模型之间存在较大差别;(2)在小扰动(如参数涨落)下,过冷沸腾作用降低,对系统稳定性影响不大,不同过冷沸腾模型给出的结果接近。
The occurrence of subcooled boiling marks the beginning of a two-phase non-equilibrium state, and may lead to the flow system into the first (ie, low vapor content) instability zone. This paper focuses on the effect of subcooling boiling on the low-pressure natural circulation flow stability of a low-temperature nuclear reactor, and investigates the influence of bubble break-off point Zd, distribution parameter C_0, drift velocity coefficient C_1 on bubble distribution and system stability . The results show that: (1) In the case of large disturbance (such as accident conditions), the feedback of cavitation bubble caused by subcooled boiling has a significant influence on the stability of the system, and there is a big difference between the different subcooling boiling models; (2) Under small disturbance (such as parameter fluctuation), the effect of subcooling boiling decreases, which has little effect on the stability of the system. The results obtained by different subcooling boiling models are close.