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首页> 外文期刊>Annals of nuclear energy >Interpretation of in-phase and out-of-phase BWR oscillations using an extended reduced order model and semi-analytical bifurcation analysis
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Interpretation of in-phase and out-of-phase BWR oscillations using an extended reduced order model and semi-analytical bifurcation analysis

机译：使用扩展的降阶模型和半解析分叉分析来解释同相和异相BWR振荡

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摘要

An extended reduced order model is presented and applied to analyze global and regional oscillations in BWRs. Stability and semi-analytical bifurcation analyses are performed using this model in conjunction with the bifurcation code BIFDD to determine the stability limits for both in-phase and out-of-phase oscillation modes and the nature of Poincare-Andronov-Hopf bifurcation. The results obtained show that both sub- and supercritical PAH bifurcations are encountered in different regions of the parameter space. An in-depth investigation of the properties of the elements of the eigenvectors associated with these two modes of oscillation is carried out. Results show that these eigenvectors provide information as regards the corresponding oscillation mode (in-phase or out-of-phase) without solving the set of system ODEs. The analysis clearly brings out the fact that in-phase and out-of-phase oscillations are whole-system mechanisms. A clear distinction is thereby made between these oscillation modes, on the one hand, and the fundamental and first azimuthal neutronics modes on the other hand.
机译：提出了扩展的降阶模型，并将其用于分析BWR中的全局和区域振荡。使用此模型结合分叉代码BIFDD进行稳定性和半分析分叉分析，以确定同相和异相振荡模式的稳定性极限以及Poincare-Andronov-Hopf分叉的性质。获得的结果表明，在参数空间的不同区域都遇到了亚临界和超临界PAH分叉。深入研究了与这两种振荡模式相关的特征向量元素的特性。结果表明，这些特征向量在不求解系统ODE集合的情况下提供了有关相应振荡模式（同相或异相）的信息。分析清楚地表明，同相和异相振荡是整个系统的机制。因此，一方面在这些振荡模式与另一方面在基本和第一方位中子学模式之间有明显的区别。

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