Analysis of Flow Excursion Instabilities in Helically Coiled Tube Steam Generator of High Temperature Gas-Cooled Reactor
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摘要: 建立与氦气对流换热的并联螺旋管蒸汽发生器数值模型,分别采用一维飘移流模型和一维可压缩流动模型描述水侧和氦气侧的流动。在此基础上研究了球床模块式高温气冷堆核电站螺旋管蒸汽发生器内的流量漂移不稳定性。动态计算结果表明,在一定条件下蒸汽发生器内有可能发生流量漂移,不同传热管流量可相差几倍,而出口温度则相差几百度。通过对质量流速-压降曲线的分析,发现热负荷对稳定性起主导作用,热负荷越大越易发生流量漂移,且边界质量流量随热负荷呈线性增长。增大入口节流阻力和过冷度可以在一定程度上避免流量飘移。最后给出了蒸汽发生器流量飘移的稳定边界。Abstract: Flow excursion in helically coiled tube steam generator of high temperature gas-cooled reactor（SG） was analyzed by numerical simulation based on a one-dimensional model.Drift-flux model for the water/steam side and compressible flow model for helium side were used.Results of dynamical simulation show that flow excursion may occur under certain conditions,which results in remarkable differences of mass flow rate and temperature between the parallel tubes.The analysis of pressure-drop versus mass flow rate curve reveals that power input is the main parameter that affects the onset of flow excursion.With the increasing of power input,flow excursion occurs at larger range of mass flow rate.To increase the inlet resistance and sub-cool degree is helpful to avoid the onset of flow excursion.Stability maps were also presented.
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