Method for establishing full three-dimensional coupling model of reactor U-shaped tubular steam generator

Abstract

The invention discloses a method for establishing a full three-dimensional coupling model of a reactor U-shaped tubular steam generator, which is suitable for all systems related to energy conversionby adopting a shell-and-tube heat exchanger in the field of energy. The coupling method mainly comprises the following steps: 1, simplifying a geometric model of the steam generator; 2, establishing aprimary and secondary side geometric model; 3, carrying out primary and secondary side three-dimensional computing node division; 4, performing spatial dispersion on a pipe side (primary side) energysource item; 5, performing spatial discretization on a shell side (secondary side) energy source item; 6, coupling primary and secondary side energy source items at the same coordinate node; and 7, performing data transmission between the primary side and the secondary side and on internal nodes of each side, and performing iteration to obtain a convergence solution. Geometric model simplification is mainly used for simplifying the workload caused by the number of a large number of heat transfer pipes to model establishment and numerical calculation. Primary and secondary side computing nodedivision adopts a completely identical division strategy; each side energy source item is obtained through a discrete flow heat transfer equation; and the data exchange of the energy source items on the two sides is carried out between the corresponding primary and secondary side computing nodes under the same coordinate.

Description

technical field [0001] The invention relates to the technical field of full three-dimensional thermal engineering coupling of a reactor U-shaped tube steam generator, in particular to a method for establishing a full three-dimensional coupling model of a reactor U-shaped tube steam generator. Background technique [0002] The steam generator is the heat transfer boundary between the primary circuit pressure barrier and the secondary circuit power system of a nuclear power plant. Its large number of heat transfer tubes occupy up to 60% of the primary circuit system area. To ensure the safety of the reactor system, its integrity must be guaranteed . During operation, the degradation of heat transfer tubes in steam generators due to factors such as stress corrosion, flow-induced vibration, wear, and thermal fatigue will lead to performance degradation and affect normal use. In severe cases, it will directly endanger the safety of the reactor. sex. The thermal-hydraulic analys...

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Problems solved by technology

[0015] The purpose of the present invention is to provide a method for establishing a full three-dimensional coupling model of a reactor U-shaped tube steam generator, which can reduce the existing The calculation error caused by the one-dimensional simplification of the energy source item on the primary side in the technology has also changed the limitations of the existing program on the number of calculation nodes in the radial and axial divisions of the primary side, realizing true three-dimensional energy coupling

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