بررسی عددی در یک نوع جدید جداساز بخار دو مرحله ای در راکتورهای آب تحت فشار

In this paper, a new type of two-stage steam separator was presented that the second stage separator was designed as a swirl-vane type instead of traditional corrugated-plate type in order to improve the separation efficiency of steam and gas in pressurized water reactors. A computational fluid dynamics (CFD) method was used to investigate the effect of this new structure on the separation efficiency and pressure drop. The flow field details of air-gas flow and the variation trend with the Reynold number and air-gas phase flux were obtained. The influencing factors such as the cylinder diameter, the distance between two stage separators and the bending angle of swirling vanes were investigated. The value of separation efficiency was high at the longer diameter, distance and greater bending angle. The separation efficiency of second stage separator experienced an increasing trend when the water flux increase and the first stage separation decrease. A good agreement was obtained between simulation results and engineering test results.