Subchannel Analysis Method Combining Resistance and Energy Distribution Including Grid Stirring Effects

Abstract

Combining the sub-channel analysis method of resistance and energy distribution including the grid mixing effect, by collecting the experimental data of various mixing grids including the reactor core mixing grid under different working conditions, the fitting can reflect the mixing grid The relationship between the momentum source term and the energy source term for the mixing performance of key components, and add the momentum source term relationship to the corresponding momentum conservation equation, and add the energy source term relationship to the corresponding energy conservation equation ; By solving the mass conservation equation, momentum conservation equation and energy conservation equation, more accurate local thermal-hydraulic parameters in the reactor core are obtained, so that the prediction of critical heat flux (CHF) value and CHF position is more accurate. The invention is not limited by the sub-channel program structure and solution method, and can be widely used in various types of sub-channel program calculations, and is mainly applied to the sub-channel program of the two-fluid model.

Description

technical field [0001] The invention belongs to the technical field of reactor fuel assembly fluid dynamics simulation and analysis, and in particular relates to a sub-channel analysis method that combines resistance and energy distribution and includes grid agitation effect. Background technique [0002] In the design and operation of nuclear power plants, critical heat flux (CHF) and critical power are one of the most important parameters that limit the operation of nuclear power plants. Below the critical power, the reactor can convert nuclear energy into electricity with maximum safety. The CHF of the fuel bundle is closely related to the local thermal-hydraulic parameters of the core. Due to the complex geometric structure of the reactor core channel and the operating conditions of a wide parameter range, an analytical solution for CHF cannot be given theoretically. [0003] The CHF relational expression of traditional nuclear fuel bundles is developed based on the exp...

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Problems solved by technology

However, the above method cannot accurately reflect the mixing characteristics of the grid, and cannot eliminate the inaccuracy in the calculation of local thermal-hydraulic parameters, because the form resistance coefficient relation used is still irrelevant to the geometric structure of the grid.

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