系统参数对超临界水冷堆子通道熵产影响分析

Numerical Research on System Parameters Effects on Entropy Generation Behavior of Supercritical Water in Reactor Core

中文关键词: 熵产行为  系统参数  超临界水  子通道  传热特性

英文关键词: Entropy generation behavior  System parameters  Supercritical water  Sub-channel  Heat transfer

中文摘要:

      利用流体力学计算软件CFX,采用结构化网格,研究系统参数如系统压力,热流密度以及质量流速对超临界水冷堆堆芯子通道内熵产行为的影响。湍流模型选择SSG雷诺应力模型,近壁面采用加强壁面处理方法。研究结果表明：系统压力对子通道熵产的影响有限,而热流密度和质量流速的影响则更为显著。随着热流密度的升高,传热对熵产的贡献增大,子通道内主流熵产增加；随着质量流速的升高,流体摩擦阻力对熵产的贡献增大,子通道内主流熵产减少。为了从热力学角度综合评估系统参数对主流熵产行为的影响,引入无量纲熵产数,进一步获得合理的热流密度和质量流速的系统参数设计方案,为超临界水冷反应堆的概念设计提供一定的理论指导。

英文摘要:

      The numerical simulation was carried out to investigate the effects of system parameters such as pressure and heat flux, on entropy generation behavior of supercritical water flow within a hexagon inner sub-channel of SCWR. The SSG Reynolds stress model with enhanced wall treatment was used as a turbulence model. The results show that the system pressure has a minor effect on the entropy generation within the heat transfer enhancement region, while the effects of the heat flux and mass flow rate are significant. The entropy generation of the supercritical water in an inner sub-channel of the hexagon rod bundle increases with the increasing heat flux and decreases with the increasing mass flow rate. The change of heat flux mainly affects the contribution of heat transfer on entropy generation while the change of mass flow rate manly affects the contribution of fluid friction. In order to fully evaluate the comprehensive effects of the heat flux and mass flow rate, a non-dimensional entropy generation number is defined. Based on the entropy generation minimization principle, an optimal system parameters operating strategy is determined. All the simulation findings will provide a theoretical guidance for the conceptual design of SCWR.