Study on Swirl and Cross Flow of 3D-Printed Rotational Mixing Vane in 2×3 Subchannel

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Study on Swirl and Cross Flow of 3D-Printed Rotational Mixing Vane in 2×3 Subchannel
Park, Haneol
Bang, In Cheol
Issue Date
Graduate School of UNIST
n pressurized water reactor (PWR), spacer grid is installed to support the fuel rod bundles, located between the fuel rod bundles. The mixing vane is installed on top of the spacer grid to generate swirl and cross flow. The swirl and cross flow enhance heat transfer and can promote critical heat flux of PWR. The safety margin of PWR could be estimated with heat transfer performance and CHF. So, the swirl and cross flow generation could bring about the safety margin and power uprate enhancement. 3D-printing technology enables to produce exquisite mixing vane blade component. The part of mixing vane was built by 3D printing. The general material is gypsum, the other is metal, stainless steel. The mixing vane is attached on top of the spacer grid, which also made by 3D printing. Rotational mixing vane is a swirl generator between the fuel rod, improve the cross flow and heat transfer characteristics. Centrifugal force provides bubble detachment from the fuel rod surface. Various types of rotational mixing vanes (RV) are studied. They are : the fan vane (FV), impeller vane (IV), the wind turbine vane (WT). Each RV shows different mixing performance and pressure drop. The FV shows the average mixing performance and pressure drop increase. The IV shows the most mixing performance, and the WT shows the least pressure drop. Experimental approach, the Particle Image Velocimetry (PIV) experiment technique visualizes flow field and evaluates mixing performance. Flow pattern visualization is accomplished inside the 2×3 subchannel, 2.5 times scale-up test section. Tests shows the flow pattern tracking and measures pressure drop. The test assures durability and maintainability of 3D printed mixing vane parts equipped in the subchannel. Numerical analysis is conducted using the commercial using computational fluid dynamics (CFD) code FLOW-3D. General Moving Object (GMO) method is used to simulate flow-driven coupled rotational motion. The Fluid-structure interaction (FSI) problem is too complex to solve analytically, so the computational technique to validate the rotational motion is also researched. The mixing performance of rotational mixing vane is evaluated by swirl and cross flow of coolant. The cross flow and swirl are qualified the mixing performance as mixing parameters. The lateral velocity, vorticity, and bubble tracking method shows the mixing of coolant, as the mixing parameters. The pressure drop is also measured and friction factor evaluation is done to assure the system safety of the reactor. For recommendation, further optimization of 3D printed mixing vane will be keep researched. Heat transfer characteristics and thermal performance enhancement for experimental and numerical analysis would be validated in extended subchannel. Adopting the rotational mixing vane in the PWR could results enhancement of the heat transfer performance, safety margin and power uprate.
Department of Nuclear Engineering
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