Conference Proceedings Paper
NUMERICAL SIMULATIONS ON THE ROTATING FLOW OF WRAPPED WIRED HPLWR FUEL ASSEMBLY
The 5th International Symposium on SuperCritical Water-cooled Reactors - 2011 March 13-16
Attila Kiss (Budapest University of Technology and Economics)
Eckart Laurien (University of Stuttgart)
Attila Aszódi (Budapest University of Technology and Economics)
Yu Zhu (University of Stuttgart)
Three dimensional computational-fluid-dynamics simulations are performed for the fluid flow within a 40 rod fuel bundle in a square arrangement with a central moderator channel. To ensure spacing between the rods the design of the bundle uses thin wires wrapped counter-clockwise around each rod. This geometry is presently investigated in the framework of the European High- Performance Light-Water Reactor (HPLWR), which operates at supercritical pressure of 25 MPa. A section with one revolution located in the evaporator region of the HPLWR core is investigated using hydraulic (to ensure fully developed flow inlet boundary conditions and reference for heated cases) and thermal-hydraulic boundary conditions. The geometry of wrapped wires gives rise to additional mixing and a circulating or ‘sweeping’ flow near the outer and inner regions of the fuel element next to the wall of the so called fuel assembly and moderator box. Some interesting flow features associated with the complex three-dimensional flow with significant transverse velocity components are visualized as the first evaluated result of this diversified investigation.
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