Method for establishing nuclear power system shell-and-tube heat exchanger numerical model under motion condition

Abstract

The invention discloses a method for establishing a numerical model of a shell-and-tube heat exchanger of a nuclear power system under a motion condition. The method is suitable for establishing a three-dimensional numerical calculation model of large heat exchange equipment of the nuclear power system under the motion condition that different forms are generated under certain external force. Thethree-dimensional numerical calculation model is mainly based on a three-dimensional thermal hydraulic numerical calculation model of the shell-and-tube heat exchanger in static operation. According to the motion forms and the stress characteristics under different motion conditions, the stress is uniform; motion decomposition, stress analysis and decomposition of a single motion, establishment ofan additional force source item acting on a momentum equation under the single motion, and a composite motion additional force source item synthesis process are carried out on a shell-and-tube heat exchanger under a composite motion condition; and finally, establishing a set of numerical calculation model capable of accurately describing the thermal hydraulic characteristics of the shell-and-tubeheat exchanger of the nuclear power system under the composite motion condition.

Description

technical field [0001] The present invention relates to the technical field of a numerical calculation model describing a shell-and-tube heat exchanger of a nuclear power system under different motion conditions, in particular to a shell-and-tube heat exchanger capable of operating under three-dimensional six-degree-of-freedom motion conditions. A numerical model establishment method for calculating the thermal-hydraulic operating characteristics of the heater. Background technique [0002] Nuclear power systems, especially small nuclear power systems, are increasingly being used in various working conditions due to their small size, high energy density, high stability and reliability. In the design process of typical offshore floating nuclear power system stations and miniaturized mobile nuclear power system equipment, the influence of sea wind and waves and the form of transportation on its internal nuclear power system should be fully considered. Secondly, due to natural ...

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Problems solved by technology

However, most of them only consider the influence of ocean conditions on the flow momentum equation, and further research is needed in the coupling calculation of convection and heat transfer. Secondly, there are few studies on the performance of shell-and-tube heat exchangers under ocean conditions.

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