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Nonlinear dynamic analysis of parallel three uniformly heated channels with water at supercritical pressures

机译：超临界压力下水平行的三个均匀加热通道的非线性动力学分析

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This study develops a nonlinear dynamic model of parallel supercritical uniformly heated channels based on three-region methodology coupled with polynomial profile approximations between flow density and flow enthalpy. The validation results against the experimental data indicate that the present model has the capability to investigate the stability issues of parallel uniformly heated channels with supercritical water. Nonlinear characteristics, stability maps and parametric effects of three uniformly heated channels with supercritical water are investigated. The results illustrate that channel-to-channel interactions among three channels will drive the system more unstable due to a more asymmetric power distribution. In addition, the hottest channel with the highest steady state flow rate would oscillate with the largest amplitude and out-of-phase with the other less heated channels under constant total inlet flow rate condition. This study also reveals that the nonlinear oscillations between inlet flow velocity and outlet flow velocity in each channel tend to present out-of-phase. It could demonstrate that increasing the pressure drop of heavy fluid region (region 1) would stabilize the system, while increasing the pressure drop of light fluid region (region 3) would destabilize the system. The parametric studies on system stability of three uniformly heated channels suggest that increasing inlet flow resistance or enlarging the channel diameter would stabilize the system, while increasing outlet flow resistance or lengthening the channel length would destabilize the system. (C) 2018 Elsevier Ltd. All rights reserved.
机译：这项研究基于三区域方法，结合流密度和流焓的多项式轮廓近似，建立了一个平行的超临界均匀加热通道的非线性动力学模型。相对于实验数据的验证结果表明，该模型具有研究具有超临界水的平行均匀加热通道的稳定性问题的能力。研究了三个超临界水均匀加热通道的非线性特性，稳定性图和参数效应。结果表明，由于功率分配更加不对称，三个通道之间的通道间交互将使系统更加不稳定。此外，在恒定的总入口流量条件下，具有最高稳态流量的最热通道将以最大振幅振荡，并且与其他较少加热的通道异相。该研究还揭示了每个通道的入口流速和出口流速之间的非线性振荡趋于呈现异相。它可以证明增加重流体区域（区域1）的压降将使系统稳定，而增加轻流体区域（区域3）的压降将使系统不稳定。对三个均匀加热的通道的系统稳定性进行的参数研究表明，增加进口流阻或增大通道直径将使系统稳定，而增加出口流阻或延长通道长度将使系统不稳定。 （C）2018 Elsevier Ltd.保留所有权利。

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