The pressure drop of a moisture separator in a steam generator is the important design parameter to ensure the successful performance of a nuclear power plant. The moisture separators have a wide range of operating conditions based on the arrangement of them. The prediction of the pressure drop in a moisture separator is challenging due to the complexity of the multi-dimensional two-phase vortex flow. In this study, the moisture separator test facility using the air/water two-phase flow was used to predict the pressure drop of a moisture separator in a Korean OPR-1000 reactor. The prototypical steam/water two-phase flow conditions in a steam generator were simulated as air/water two-phase flow conditions by preserving the centrifugal force and vapor quality. A series of experiments were carried out to investigate the effect of hydraulic characteristics such as the quality and liquid mass flux on the two-phase pressure drop. A new prediction model based on the scaling law was suggested and validated experimentally using the full and half scale of separators. The suggested prediction model showed good agreement with the steam/water experimental results, and it can be extended to predict the steam/water two-phase pressure drop for moisture separators.

蒸汽发生器中水分分离器的压降是保证核电站成功运行的重要设计参数。湿气分离器根据它们的布置具有广泛的操作条件。由于多维两相涡流的复杂性，水分分离器中压降的预测具有挑战性。在这项研究中，使用空气/水两相流的水分分离器测试设备用于预测韩国 OPR-1000 反应器中水分分离器的压降。通过保持离心力和蒸汽质量，蒸汽发生器中的原型蒸汽/水两相流动条件被模拟为空气/水两相流动条件。进行了一系列实验以研究水力特性如质量和液体质量通量对两相压降的影响。提出了一种基于标度定律的新预测模型，并使用全尺寸和半尺寸分离器进行了实验验证。建议的预测模型与汽水实验结果吻合良好，可推广用于汽水分离器汽水两相压降的预测。