Numerical simulation method for inter-box flow of liquid metal cooled fast reactor

Abstract

The invention discloses a numerical simulation method for inter-box flow of a liquid metal cooled fast reactor core. The method mainly comprises the following steps: 1, dividing an inter-box channel control body; 2, establishing an inter-box channel control equation; 3, discretizing the control equation; 4, obtaining initial parameters and transient boundary conditions of an inter-box channel; 5,programming, iterating and solving four control equations; and 6, outputting changes of a temperature field and a speed field of a channel between transient boxes. According to the numerical simulation method, modeling is carried out according to the real geometrical characteristics of the inter-box channel, the natural circulation path of the inter-box flow and the influence of the inter-box flowon the temperature distribution and residual heat removal capacity of the reactor core under the accident condition are analyzed, and therefore the safety of the liquid metal cooling fast reactor isevaluated more comprehensively and effectively.

Description

technical field [0001] The invention relates to the field of thermohydraulic calculation of nuclear reactors, in particular to a numerical simulation method for flow between liquid metal cooling fast reactor core boxes. Background technique [0002] The pool-type liquid metal cooling fast reactor core includes the fuel assembly in the box and the passage between the boxes. In the natural circulation stage of waste heat discharge after the accident shutdown, the cold fluid flowing through the heat exchanger after the accident waste heat will sink. Because the core is hot, the buoyancy force generated by the density difference under natural circulation makes the cold fluid enter the inter-cassette area through the core shielding opening, forming an inter-cassette flow. Due to the narrow channel between the boxes and the low Prandtl number of the liquid metal, the flow and heat transfer between the boxes has a great influence on the natural circulation of the core. At low flow...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the one-dimensional system thermal-hydraulic program box flow model is rough, which increases the uncertainty of thermal-hydraulic analysis and calculation; the CFD three-dimensional numerical simulation software box model is relatively fine, but the grid division Difficult, coupled with other components, the size span is large, resulting in low software calculation efficiency and poor convergence

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