Thermal hydraulic multi-scale partition simulation method of nuclear power device main-coolant system

Abstract

The invention provides a thermal hydraulic multi-scale partition simulation method of a nuclear power device main-coolant system. The method comprises the following steps: (1) performing computation region division on a main coolant system; (2) establishing a mathematic model for each region, realizing system loop multi-scale modelling and compiling a simulation program, wherein the multi-scale model program comprises a thermal hydraulic system program, a thermal hydraulic sub-channel program and a computational fluid dynamics program; (3) establishing a boundary interface scheme and a data transmission scheme of each region; (4) establishing a time step length setting scheme, a data exchange scheme and a convergence judgment setting scheme according to the scale feature of each region; and (5) configuring the main-coolant system multi-scale program distributed parallel computational environment to realize the multi-region combined simulation. The method provided by the invention is suitable for the multi-scale partition modelling combined simulation method of the thermal hydraulic computation of the nuclear power device main coolant system, the precision of the local computation can be guaranteed, and the fastness of the computation can be guaranteed.

Description

technical field [0001] The invention relates to a reactor thermal-hydraulic simulation method, in particular to a thermal-hydraulic simulation method for a main coolant system of a nuclear power plant. Background technique [0002] The main coolant system of a nuclear power plant is the most important system in the primary loop system. It has major equipment such as the reactor core, voltage stabilizer, main pumps for each loop, and steam generators, and is responsible for transferring the heat generated by the core fuel through the coolant. Transfer to the secondary circuit, and ensure that under normal operating conditions, the entire circuit will not be overheated or overpressured. The thermal-hydraulic calculation of the main coolant system is usually divided into three scales: system scale, component scale and local scale, and the corresponding control volume / grid scale decreases in turn. The main coolant system is a closed system loop. In order to ensure the stability...

AI Technical Summary

Problems solved by technology

If the system is split and modeled in partitions, the voltage regulator will lose its effect on other loops, which will cause the pressure calculation oscillation of each control body, the system flow calculation will diverge, and the system stability will be poor

[0005] (2) The use of different scale models in multiple partitions will lead to great differences in the time step and calculation time cost of each area. If the calculation sequence and convergence conditions are not set properly, it will lead to low simulation efficiency and even calculation divergence.

Images