李英杰, 陈丽华, 钱敏等. 面向主给水系统的流动调整器整流性能数值研究. 力学与实践, 2023, 45(4): 793-804. DOI: 10.6052/1000-0879-22-601
引用本文: 李英杰, 陈丽华, 钱敏等. 面向主给水系统的流动调整器整流性能数值研究. 力学与实践, 2023, 45(4): 793-804. DOI: 10.6052/1000-0879-22-601
Li Yingjie, Chen Lihua, Qian Min, et al. Numerical study of performance of flow conditioners for water feeding system. Mechanics in Engineering, 2023, 45(4): 793-804. DOI: 10.6052/1000-0879-22-601
Citation: Li Yingjie, Chen Lihua, Qian Min, et al. Numerical study of performance of flow conditioners for water feeding system. Mechanics in Engineering, 2023, 45(4): 793-804. DOI: 10.6052/1000-0879-22-601

面向主给水系统的流动调整器整流性能数值研究

NUMERICAL STUDY OF PERFORMANCE OF FLOW CONDITIONERS FOR WATER FEEDING SYSTEM

  • 摘要: 针对某核电站主给水系统低负荷时文丘里流量计测值虚高所提出的流场改善需求,利用计算流体力学方法结合SST k–ω湍流模型,研究安装流动调整器时的流场特征和整流性能。首先分别对流场未安装和安装栅格(AMCA)调整器及不同结构参数的孔板调整器进行三维建模和计算,获得不同调整器对流场速度、压力、流场均匀度及流量计流出系数的影响,对比不同调整器对旁路支管所致流速畸变的整流性能,并确定选用孔板调整器的构型。其次改变调整器安装位置,对比安装位置对流场速度分布、阻力损失、均匀度改善及流量计流出系数的影响。三是针对满负荷大流量工况,将调整器与不同开度的主调节阀耦合建模,计算调整器所致额外压力损失,分析阀门开度与整流器压力损失的关系。获得的调整器构型和安装位置等参数的影响规律可为核电站主给水系统解决同类问题时的流动调整器选型和安装提供参考。

     

    Abstract: Flow conditioners are widely used to improve flow uniformities, ensuring flow meter measurement accuracy. In this paper, a series of 3-D computational fluid dynamics investigations using SST k–ω turbulence model were carried out to reveal the flow characteristics of the main feed water system of a nuclear power plant with AMCA and three types of perforated flow conditioner. Firstly, results showed that the configuration affected the velocity profile and pressure of downstream, flow uniformity, flow meter discharge coefficients. A perforated flow conditioner with extended length and increased porosity was selected for its rectification performance. Secondly, results illustrated the installation position affects the uniformity as well as pressure and velocity distribution. Thirdly, the extra pressure loss caused by the flow conditioner was analyzed, and the relation between the flow conditioners and the main valve openings was discussed at full load.

     

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