期刊
NUCLEAR ENGINEERING AND DESIGN
卷 262, 期 -, 页码 371-389出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.nucengdes.2013.04.026
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资金
- U.S. Department of Energy Office of Nuclear Energy's Nuclear Energy Advanced Modeling and Simulation (NEAMS) program
- U.S. Department of Energy [DE-AC02-06CH11357]
Large uncertainties still exist in the treatment of wire-spacers and drag models for momentum transfer in current lumped parameter models. To improve the hydraulic modeling of wire-wrap spacers in a rod bundle, a three-dimensional momentum source model (MSM) has been developed to model the anisotropic flow without the need to resolve the geometric details of the wire-wraps. The MSM is examined for 7-pin and 37-pin bundles steady-state simulations using the commercial CFD code STAR-CCM+. The calculated steady-state inter-subchannel cross flow velocities match very well in comparisons between bare bundles with the MSM applied and the wire-wrapped bundles with explicit geometry. The validity of the model is further verified by mesh and parameter sensitivity studies. Furthermore, the MSM is applied to a 61-pin EBR-II experimental subassembly for both steady state and PLOF transient simulations. Reasonably accurate predictions of temperature, pressure, and fluid flow velocities have been achieved using the MSM for both steady-state and transient conditions. Significant computing resources are saved with the MSM since it can be used on a much coarser computational mesh. (C) 2013 Elsevier B.V. All rights reserved.
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