A method for building a full three-dimensional coupled model of a reactor u-tube steam generator

Abstract

A method for establishing a full three-dimensional coupling model of a reactor U-shaped tube steam generator is applicable to all systems in the energy field that use shell-and-tube heat exchangers for energy conversion. The coupling method mainly includes the following parts: 1. Simplification of the geometric model of the steam generator; 2. Establishment of the geometric model of the primary and secondary sides; 3. The three-dimensional calculation node division of the primary and secondary sides; 4. The energy source item space of the tube side (primary side) Discrete; 5. Discretization of energy source items on the shell side (secondary side); 6. Coupling of energy source items on the primary and secondary sides at the same coordinate nodes; 7. Data transfer between primary and secondary sides and internal nodes on each side, iteration a convergent solution. Geometric model simplification is mainly used to simplify the workload caused by a large number of heat transfer tubes for model establishment and numerical calculation; the division of primary and secondary calculation nodes adopts exactly the same division strategy; the energy source items of each side are obtained through discrete flow heat transfer equations; The data exchange of energy source items on both sides is carried out between the corresponding primary and secondary computing nodes under the same coordinates.

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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