Abstract One-dimensional (1-D) numerical simulations were carried out of two vertical heated parallel- channel experiments using a linear frequency domain approach to investigate the wall energy storage effect on the system's stability boundary for supercritical water up-flow. Oscillatory instability boundaries of the experimental cases with two different wall thicknesses, uniform and non-uniform power distributions are produced, assessed and discussed. In all, 31 cases were examined. These instability predictions with wall energy storage effects are compared with experimental data and other numerical results obtained without wall heat effects. There is improved agreement on the stability boundary predictions when the wall energy storage effect is included; however, all results fall within the experimental uncertainty. There is a cancellation effect of the wall energy storage in two parallel channels compared to a single channel. Consequently, the effect of wall energy storage is relatively small for the experiments modeled.

中文翻译：

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蓄热对两个加热平行通道中超临界流动稳定性的影响

摘要 使用线性频域方法对两个垂直加热平行通道实验进行一维 (1-D) 数值模拟，以研究壁面储能对超临界水上升流系统稳定性边界的影响。产生、评估和讨论具有两种不同壁厚、均匀和非均匀功率分布的实验案例的振荡不稳定边界。总共检查了31个案例。这些具有壁能量存储效应的不稳定性预测与没有壁热效应的实验数据和其他数值结果进行了比较。当包括壁面储能效应时，稳定性边界预测的一致性得到改善；然而，所有结果都在实验不确定性之内。与单个通道相比，两个平行通道中的壁能量存储存在抵消效应。因此，对于模拟的实验，壁能量存储的影响相对较小。