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本文以熔盐堆脱气系统中旋叶式气泡分离器为研究对象,利用数值分析软件Fluent对分离器内的流场进行了数值模拟,并分析了其工作原理和影响因素。首先,不同的湍流模型计算结果与实验现象的对比分析表明,雷诺应力模型在不同工况下计算得到的流场分布与实验现象符合最好。在确定适合用于模拟旋叶式气泡分离器内流场的计算模型基础上,对分离器内流场作进一步的计算分析。结果表明,水在流量20 m3·h-1条件下,流经分离器搅浑叶片后,会形成一种中心低速低压的旋转流动,且在横截面中心区域附近存在很大的径向压降梯度,如果水流中存在少量气泡,便会在压力梯度的作用下,流向分离器中心,汇聚形成稳定的气芯,从而实现对流体中气相的连续分离。
In this paper, the rotary vane bubble separator in the molten salt reactor deaeration system is taken as the research object. The numerical simulation software Fluent is used to simulate the flow field in the separator, and its working principle and influencing factors are analyzed. First of all, the comparison between the results of different turbulence models and experimental phenomena shows that the flow field distribution calculated by the Reynolds stress model is in good agreement with the experimental phenomena under different operating conditions. Based on the calculation model which is suitable for simulating the flow field in a rotary vane bubble separator, the flow field in the separator is further calculated and analyzed. The results show that the water flows at a flow rate of 20 m3 · h-1 and flows through the turbulator blades of the separator to form a central low-pressure swirling flow with a large radial pressure drop gradient near the center of the cross-section , If there is a small amount of bubbles in the water flow, it will flow to the separator center under the pressure gradient and converge to form a stable air core, so as to realize the continuous separation of the gas phase in the fluid.