两相自然循环非线性特征及实验研究

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Nonlinear Characteristics of Two-Phase Natural Circulation and Its Experimental Investigation

1. Department of Nuclear Science and System Engineering, Shanghai Jiaotong University, 200030, China;
2. Shandong Nuclear Power Co. Ltd, Yantai, Shandong, 264000, China;
3. National Key Laboratory of Bubble Physics & Natural Circulation, Nuclear Power Institute of China, Chengdu, 610041, China

摘要: 采用均相模型,基于分岔理论预测了两相自然循环系统的流量漂移(静态分岔)相关特性,并对其进行了实验验证。同时,对系统的动态参数时序进行了时域和频域分析,研究了特定工况下沸腾喷发弛张动态不稳定性机理。通过对系统相关时序的相空间重构与分维分析,探讨了系统随加热功率变化的非线性演化规律。
- 两相流自然循环 /
- 静态分岔 /
- 沸腾喷发 /
- 弛张不稳定性
Abstract: Based on experimental investigation and bifurcation analysis on two-phase natural circulation system,certain nonlinear mechanisms of the system,especially static bifurcation features and hysteresis effect,are verified and discussed in this paper.Study of time series of the dynamic parameters is carried out in both time and frequency domains,with boiling eruption induced relaxation instability mechanism under certain conditions being suggested and investigated.Further,through the phase space reconstruction of relating time series and fractal analysis,discussion to nonlinear evolution of the system with varying heating power is delivered.
- Two-phase natural circulation /
- Static bifurcation /
- Boiling eruption /
- Relaxation instability