Calculation method for aerosol transport in gas gap of fuel element of lead-bismuth fast reactor based on euler-lagrange method

By combining the Euler-Lagrange method and the DPM model, the diffusion and deposition of aerosols within the gas gap of lead-bismuth fast reactor fuel elements were simulated. This method addresses the shortcomings in calculating aerosol distribution within the gas gap and improves the accuracy and versatility of fission product release analysis.

CN117648884BActive Publication Date: 2026-09-15XI AN JIAOTONG UNIV
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Patent Information

Application Number
CN202311711152.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-12-13
Publication Date
2026-09-15
Estimated Expiration
2043-12-13

AI Technical Summary

Technical Problem

Existing technologies are insufficient to accurately calculate the distribution and deposition of aerosols within the air gaps of lead-bismuth fast reactor fuel cladding, resulting in insufficient research on the release behavior of fission products into the coolant, especially lacking effective analytical methods under accident conditions.

Method used

A computational method based on the Euler-Lagrange method, combined with a discrete term model (DPM), is used to simulate the diffusion, migration, and deposition process of aerosols in the air gap. The composition and phase of the fission products are considered, the micro-circulation flow field of natural convection of gas in the air gap is calculated, and a new wall deposition determination method is introduced to track the movement trajectory of aerosol particles.

Benefits of technology

It achieves accurate simulation of the aerosol transport and deposition process in the gas gap of lead-bismuth fast reactor fuel cladding, improves the calculation accuracy of aerosol migration path and deposition rate, fills the relevant research gap, and has universality applicable to fuel rods of different types and burnup.

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Abstract

A kind of lead bismuth fast reactor fuel element gas gap inside aerosol transport calculation method based on Euler-Lagrange method, 1, the geometric model of fuel element gas gap and cladding structure is established;2, calculate the thermal conductivity of mixed gas;3, calculate the temperature distribution of the outer surface of pellet and the inner surface of fuel cladding;4, calculate the natural convection flow field in gas gap under steady state;5, calculate the particle size distribution parameters according to the mass fraction of aerosol with different particle size;6, considering the gravity, drag force, thermophoresis force, saffman lift and turbulent random velocity fluctuation suffered by aerosol in gas gap, establish the equation of motion of aerosol particles, set the particle tracking parameters;7, set the wall deposition conditions of fuel surface and cladding surface;8, output the calculation results.The method considers the random distribution of aerosol particle size and the influence of turbulence on particle motion, and corrects the wall deposition conditions, and calculates the transport and deposition of aerosol in fuel element gas gap under steady state based on Euler-Lagrange method.
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