A Mesh Modeling Method for Wire Wound Fuel Assembly

A fuel assembly and grid model technology, applied in 3D modeling, instrumentation, design optimization/simulation, etc., can solve problems such as model uncertainty errors, achieve fast convergence, optimize design, and reduce the number of grids

CN109190253BActive Publication Date: 2020-06-02XI AN JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2020-06-02

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Abstract

The invention discloses a grid model characterization method of a fuel assembly with filament winding, comprising the following steps: firstly, establishing a channel geometric model of the fuel assembly without filament winding; establishing a planar topology suitable for the fuel assembly channel cross section; setting the number and distribution of nodes on the topology to form a planar mesh; stretching surface mesh to form a three-dimensional structured hexahedral mesh model; checking whether the distance between the center of each mesh cell and the wound wire centerline is less than the wound wire radius, and marking the wound wire mesh cell according to the distance; Separating and removing the marked grid elements to form a fuel assembly channel grid model with filament winding; A method and apparatus for characterize a filament-wound fuel assembly using an unstructured grid aft a filament diameter is changed or a center distance between that filament and the fuel rod is changed, The mesh quantity is too large, the quality of mesh is low, and the geometry structure is inconsistent with the real situation. At the same time, it is easy to generate different mesh models according to the change of the winding structure, which is convenient for the sensitivity analysis and optimization design of the winding structure.
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Description

technical field

[0001] The invention relates to the field of thermal-hydraulic design of fast neutron reactor cores, in particular to a method for calculating grid models of fast reactor cores with wire-wrapped fuel assemblies. Background technique

[0002] The core of a fast neutron reactor is a compact heat source with complex flow paths and a large number of components. A single assembly bundle region usually consists of a channel enclosed by a plurality of fuel rods placed in a hexagonal outer casing. The fuel rods are arranged in a triangular grid. In the axial direction, adjacent fuel rods are fixed by metal winding wires wound according to a certain pitch. The introduction of the wire-wound structure makes the thermal-hydraulic phenomena of the fast reactor components have extremely strong three-dimensional characteristics, and the temperature field and flow field are extremely unevenly distributed. Accurately simulating the thermal-hydraulic characteristics of coo...

Examples

Embodiment Construction

[0034] Combine the following Figure 5 The flow chart shown takes a typical fast reactor as an example to further describe the present invention in detail.

[0035] A method for drawing a grid model of a wire-wrapped fuel assembly of the present invention comprises the following steps:

[0036] Step 1: Establish a three-dimensional geometric model for the typical fast reactor fuel assembly bundle area. The selected calculation domain includes the entire active section in the axial direction, and 61 fluid channels formed by the wrapped wire fuel rods and the hexagonal casing in the radial direction. In the geometric modeling stage, it is not necessary to build the geometry of the 61 winding wires. Specifically, the cross-sectional shape of the channel is drawn, and then stretched along the axial direction to generate a three-dimensional channel geometric model, such as figure 1 shown.

[0037] Step 2: Use the structured hexahedral grid to characterize the geometric model est...