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超临界水冷堆类四边形子通道内超临界水的传热试验研究

DOI: 10.13334/j.0258-8013.pcsee.2014.20.015, PP. 3356-3361

Keywords: 超临界水冷堆,类四边形子通道,管壁温度,传热,试验研究

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Abstract:

在压力23~28MPa、质量流速700~1300kg/(m2?s)、热流密度200~800kW/m2的参数范围内,对超临界水冷堆堆芯棒径D=8mm、栅距比P/D=1.2的类四边形子通道内超临界水的传热特性及管壁温度分布进行了试验研究,分析了压力、热流密度和质量流速对管壁温度及传热特性的影响,并与环形通道内超临界水的传热特性进行了对比。试验结果表明:在超临界压力区,类四边形子通道管壁温度随着焓值的增大而逐渐上升,换热系数在拟临界点附近达到峰值,低焓值区的换热系数比高焓值区大;随压力增大,壁面温度升高,换热系数峰值减小;热负荷的增大和质量流速的减小均会使壁面温度升高,换热系数减小,削弱传热强化。与环形通道对比发现,在低焓值区,类四边形通道与环形通道内壁温度和换热系数相差不大;超临界水在类四边形子通道内比在环形通道内更容易渡过拟临界区,拟临界区对类四边子形通道的影响比对环形通道的影响小。

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