The dynamic analysis of a uniformly heated channel at a supercritical pressure using a simple nonlinear model

Lee, Jin-Der; Chen, Shao Wen

doi:10.1016/j.anucene.2018.11.004

Cited by 7 publications

(2 citation statements)

References 14 publications

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“…Table 1 lists the reference condition for three representative supercritical heating channels, which are extracted from the design data for U.S. reference SCWR [25]. In the present model, the fluid properties of supercritical water are obtained from the database of Nation Institute of Standards and Technology (NIST) [26], which have been widely used in the literature [5][6][7][8][9][10][11][12][13][14][15][16]. Based on the parameter values given in Table 1, this non-linear model can explore the stability maps of the static system by setting =0 ses a + through time domain evolutions.…”

Section: Stability Map Of the Static Systemmentioning

confidence: 99%

“…However, because their complexity and time-consumption, these tools are, in general, not favorable for the detailed investigation of non-linear phenomena. Thus, our recent studies developed simple non-linear dynamic models to analyze the stability problems of supercritical water uniformly heated in a single channel [13] and parallel channels [14], respectively, particularly for that after the occurrence of instability. The results indicated that complex and abundant non-linear phenomena, such as supercritical Hopf and period-doubled bifurcations, and their evolutions to chaotic oscillations, could appear in a uniformly-heated channel with supercritical water [13].…”

Section: Introductionmentioning

confidence: 99%

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Non-Linear Qualitative Dynamic Analysis of Supercritical Water-Heated Channels under External Vertical Accelerations

Lee

Chen

2021

Applied Sciences

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Employing the external force method to regard seismic impact and the three-region methodology to analyze the supercritical heated channel, a non-linear dynamic model was developed to investigate the transient characteristics of single channel or parallel channels under the impacts of vertical sinusoidal and seismic accelerations. The present model was validated against the experimental data, which could suitably estimate the additional pressure drop caused by the vertical vibrations. The influences of parameters on the seismic-induced oscillation conducted in a supercritical heated channel indicated that a longer heated length, uprating operation power and a larger outlet loss coefficient all exhibit unstable effects, while the increase of inlet loss coefficient, a larger tube diameter and a lower inlet fluid temperature would tend to stabilize the system. Moreover, the supercritical fluid would present a high natural frequency in the very small NP-SUB region. The parametric effects on the parallel channel system are related to the inherent stability nature of initial state and the interactions among channels. The more uneven heat flux distribution among channels would cause a larger vibration-induced oscillation. In particular, when it is combined with the resonance effect, the system may exhibit much larger oscillations than in the case of non-resonance.

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