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首页> 外文会议>International Conference on Nuclear Engineering >ANALYSIS OF GAS ENTRAINMENT PHENOMENON FROM FREE LIQUID SURFACE FOR A SODIUM-COOLED FAST REACTOR DESIGN: VALIDATION OF VELOCITY PROFILE AND STROUHAL NUMBER IN A FLOW FIELD
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ANALYSIS OF GAS ENTRAINMENT PHENOMENON FROM FREE LIQUID SURFACE FOR A SODIUM-COOLED FAST REACTOR DESIGN: VALIDATION OF VELOCITY PROFILE AND STROUHAL NUMBER IN A FLOW FIELD

机译：从钠冷却的快速反应器设计中自由液面气体夹带现象分析：流场中速度剖面和斯特鲁姆数的验证

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Gas entrainment (GE) from cover gas, which is an inert gas to cover sodium coolant in a reactor vessel, is one of key issue for Sodium-cooled fast reactors (SFRs) design to prevent unexpected effects to core reactivity. In this research series, evaluation method has been investigated for surface dimple depth growth of unstable drifting vortex dimples on the liquid surface in the reactor vessel. By using a computational fluid dynamics (CFD) code, analyses have been conducted to estimate the drifting vortex on water experiments in a circulating water tunnel. The unstable drifting flow vortexes on the water surface were generated as wake vortexes behind a plate obstacle. Downward flow velocity was induced by bottom slit flow pass along the flow channel. In the previous study, the onset conditions of the gas entrainment were evaluated based on existing non-dimensional numbers method by using the STREAM-VIEWER code. However, the CFD predication accuracy of the detail flow field itself was not clear especially for vortex frequency in the wake flow and detail velocity profiles in the flow channel. In this study, to clarify the accuracy of CFD analysis, Strouhal numbers of vortex frequency and detail flow velocity profiles were compared with experimental data which were measured by Particle Image Velocimetry (PIV) method. As the results, the Strouhal numbers of the vortex frequency behind the plate obstacle reasonably agreed with experimental data. Prediction accuracy for the velocity profiles in the flow channel were also confirmed by comparisons with measured data by the PIV method.
机译：来自覆盖气体的气体夹带（Ge），其是惰性气体以覆盖反应器容器中的钠冷却剂，是钠冷却的快速反应器（SFRS）设计的关键问题之一，以防止意外影响核心反应性。在该研究系列中，已经研究了评估方法，用于在反应器容器中的液体表面上的不稳定漂移涡流凹坑的表面凹坑深度生长。通过使用计算流体动力学（CFD）代码，已经进行了分析以估计循环水隧道中的水实验上的漂移涡流。水面上的不稳定漂移流动涡旋被产生为板障碍后面的苏醒涡旋。沿着流动通道底部狭缝流动诱导向下流速。在先前的研究中，通过使用流查看器代码基于现有的非尺寸数字法评估气体夹带的开始情况。然而，细节流场本身的CFD预测精度尤其是在流动通道中的唤醒流程和细节速度配置中的涡流频率。在本研究中，为了阐明CFD分析的准确性，将涡旋频率和细节流速谱的斯特鲁姆数量与通过粒子图像速度（PIV）法测量的实验数据进行比较。结果，与实验数据合理地同意板障碍后面的涡流频率的斯特鲁姆数量。通过PIV方法测量数据的比较，还通过比较确认了流动通道中的速度分布的预测精度。

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