Fine Flow State Simulation and Configuration of PWR Fuel Rod Bundle Channels
In an effort to delve deeper into the intricate flow dynamics of eddy currents between the channels of fuel rod bundles,and thereby enhance the heat transfer and flow performance of nuclear reactors through innovative features like mixing vanes,a meticulous analysis was undertaken.In the study,parameterization and automation were implemented to construct a tear type mixing wing structure,as well as refined CFD(Computational Fluid Dynamics)calculations.The quantitative relationship between the structure and the flow field was obtained,and vortex combination analysis was carried out for small and characteristic watersheds,respectively.By harnessing the capabilities of program,adjustments were applied to the foundational flow field obtained from simulations,re-sulting in a diverse array of novel,finely-tuned flow patterns.These unconventional flow patterns underwent thorough numerical and visual scrutiny,leading to the identification of the most promising configurations.Through a quantitative exploration of parameters,including critical hotspot tem-peratures,a noteworthy insight emerged:the amplitude of transverse velocity within vortices does not holistically mirror the homogeneity of the entire flow field.Rather,it is the intricate interplay between vortex locations,shapes,and the efficacy of flow field blending that assumes paramount importance.Particularly influential are the lead vortices,distinguished by their alignment with the x-axis and their consequential impact.Modifications to these dominant vortices trigger shifts in flow direction,potentially giving rise to intermediate vortices amidst channels.Encouragingly,the favored combinations of vortices not only facilitate effective mixing but also exhibit a reduced pres-sure drop.This dual advantage signifies that these optimized vortex configurations hold promise for achieving both enhanced heat transfer and improved flow characteristics.
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