Melt and concrete interaction analysis method based on particle method

Abstract

A melt and concrete interaction analysis method based on a particle method mainly comprises the following steps that 1, conducting particle modeling, and setting initial arrangement and parameters ofparticles; 2, establishing and dividing a background grid according to nodes, and retrieving neighbor particles; 3, calculating the enthalpy value, temperature and phase state of the particles; 4, calculating eutectic and chemical reactions, updating particle matter components and physical property parameters, meanwhile, calculating chemical heat and updating the particle enthalpy value, temperature and phase state; 6, calculating gas motion and updating the particle type, speed and position; 7, displaying and calculating a viscosity item, a surface tension item and a gravity item in the momentum equation, and estimating the particle speed and position; 8, displaying and calculating a pressure item in the momentum equation by using the estimated particle position, and correcting the particle speed and position; 9, outputting a calculation result. All phenomena of interaction between the melt and the concrete are considered. Based on a particle method, the free liquid level can be accurately captured and modeling and accurate phase change processing are facilitated and large-scale calculation is facilitated by adopting the display pressure model.

Description

Technical field [0001] The invention relates to the technical field of research on the interaction between core melt and concrete of a nuclear power plant in a serious accident, in particular to a particle method-based analysis method for the interaction between melt and concrete. Background technique [0002] When a serious accident occurs in a pressurized water reactor of a nuclear power plant, the core may melt and migrate downward if it is not sufficiently cooled. The melting of the core falling into the lower head of the pressure vessel may melt the lower head, and then, The core melt will enter the containment and interact with the concrete in the containment for a long time. This process involves numerous chemical and physical changes. The high temperature melt will continue to heat the concrete, causing its temperature to rise and melting and chemical decomposition. The decomposition of concrete will produce water vapor and other non-condensable gases, which will affect ...

AI Technical Summary

Problems solved by technology

At present, a few scholars have used the moving particle method to simulate the interaction process between melt and concrete, but they have not fully considered all the mechanistic phenomena in the interaction process between melt and concrete, and made a lot of assumptions in the simulation process, especially It ignores the chemical decomposition and the generation of non-condensable gas during the interaction between the melt and concrete

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