Method for researching high Rayleigh number fusion pool heat transfer characteristics by moving particle finite volume method

A technology of high Rayleigh number and melting pool, applied in the direction of material thermal development, etc., can solve problems such as large errors

Active Publication Date: 2019-07-23
XI AN JIAOTONG UNIV
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Although the particle method has its unique advantages in dealing with fluid flow and phase transition problems, when the particle method ca

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  • Method for researching high Rayleigh number fusion pool heat transfer characteristics by moving particle finite volume method
  • Method for researching high Rayleigh number fusion pool heat transfer characteristics by moving particle finite volume method
  • Method for researching high Rayleigh number fusion pool heat transfer characteristics by moving particle finite volume method

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[0145] The present invention is a method for studying the heat transfer characteristics of a high Rayleigh number melting pool by using the moving particle finite volume method, such as figure 1 As shown, the steps are as follows:

[0146] Step 1: According to the research problem, particle modeling is carried out on the high Rayleigh number melting pool. Different types of particles represent different substances, and each particle has its corresponding mass, density, melting enthalpy and other information according to the substance represented, as For convenience of description, if a particle i is used to represent a certain particle, its mass, density, and melting enthalpy are marked as m i , ρ i , Set the initial arrangement of the particles, including the position, velocity, pressure and temperature of the particles, and the corresponding marks are r i , u i ,p i and T i , the distance between two adjacent particles when the particles are initially arranged is deno...

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Abstract

The invention discloses a method for researching high Rayleigh number fusion pool heat transfer characteristics by a moving particle finite volume method. The method comprises the following main stepsthat: 1: carrying out particle modeling by aiming at a specific problem, and setting a particle initial layout; 2: according to the position of each particle, dividing a grid; 3: after a time step length [Delta]t, using the finite volume method to solve an energy equation; 4: through a particle method, processing a viscosity term and a source term in an explicit calculation momentum equation, andestimating the speed and the position of the particle; 5: calculating particle number density, and solving a pressure Poisson equation; 6: calculating the correction value of the speed, and calculating the speed and the position of each particle in a next time level; and 7: outputting a calculation result, and according to a solved specific problem, outputting wall surface heat flux density and the phase state of substances in a fusion pool. The method has the advantages that a free liquid surface is accurately captured by a particle method and a phase change problem is simulated, and calculation accuracy is high. Through the method, the high Rayleigh number fusion pool heat transfer characteristics are researched, and an important basis is provided for researching the safety characteristics of the serious accident of a nuclear power plant reactor.

Description

technical field [0001] The invention relates to the technical field of research on heat transfer characteristics of head melting pools under severe accidents in nuclear power plants, in particular to a method for studying heat transfer characteristics of high Rayleigh number melting pools by using the finite volume method of moving particles. Background technique [0002] When a serious accident occurs in a nuclear power plant pressurized water reactor, if the core cannot be effectively cooled, the temperature will rise rapidly, causing a large number of fuel assemblies and structural materials to melt and migrate to the bottom of the pressure vessel, and the high-temperature melt entering the lower head will gradually accumulate A debris bed or melting pool is formed, which continuously transfers decay heat to the wall of the lower head. When the decay heat cannot be fully exported, the melting pool will heat the wall of the lower head to a very high temperature, seriously t...

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Application Information

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IPC IPC(8): G01N25/20
CPCG01N25/20
Inventor 田文喜李勇霖陈荣华苏光辉秋穗正
Owner XI AN JIAOTONG UNIV
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