Analysis of Flow Instability Types and Dynamic Behaviors for Supercritical Water
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摘要: 针对超临界水冷堆(SCWR)中可能出现的流动不稳定性,采用自编程序SCIA对并联双通道内的超临界水流动不稳定的动态特性进行研究,得到系统的水动力曲线。研究结果表明:超临界水流量脉动周期约为流体流过通道时间的1～2倍;流量脉动沿轴向存在明显的相位差,进出口相位差约为180°;流量扰动在拟临界区域传播较快,在其他区域传播较慢;超临界水流动不稳定动态特性符合密度波流动不稳定性的规律;流量漂移在SCWR中很难发生。Abstract: Numerical analysis has been carried out for supercritical flow instability in two parallel chan-nels by applying in-house code SCIA.The dynamic behaviors during flow oscillation have been analyzed.Curves of pressure drop versus flow rate are obtained.Results show that the period of supercritical flow in-stability is 1~2 times of the fluid transit time;the propagation of mass flux perturbations delays between inlet and outlet;and mass flux perturbations propagate faster in pseudo-critical region than other regions.The similarities between supercritical flow dynamic behaviors and the density wave oscillations（DWO） charac-teristics indicate that DWO exits in supercritical region,while the curves of pressure drop versus flow rate show that the Ledinegg instability can hardly occur.
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Key words:
- Supercritical /
- Density wave /
- Ledinegg instability /
- Dynamic behaviors
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