Near-far zone coupling numerical simulation method suitable for thermal drainage and deepwater discharge in nuclear power plant

Abstract

The invention relates to a near-far zone coupling numerical simulation method suitable for thermal drainage and deepwater discharge in a nuclear power plant. The near-far zone coupling numerical simulation method comprises the following steps: establishing a far zone model; starting the far zone model; calculating the far zone model; invoking and judging a near zone model; performing model conversion; generating a near zone jet on-way flow rate and a concentration source term; finishing the judgment of the far zone model. The near-far zone coupling numerical simulation method provided by the invention has the benefits that the near zone floating jet dilution process is stimulated by adopting a near zone jet integral model, a source term calculation formula for converting a near zone model calculation result into an input far zone model through a decentralized convergence method is provided, and a method of dynamic coupling of the near-far zone mathematical models is provided. The degree of dilution in the hot water rising process and at the final rising height as well as the source term can be more reasonably reflected through the provided near-far zone coupling model method; meanwhile, the water flow quality conservation can be ensured, the simulation precision within a surface high-temperature rise affecting range is obviously improved, and a useful scientific basis is provided for accurate evaluation on the environmental impact of thermal drainage and discharge in the nuclear power plant.

Description

technical field [0001] The invention relates to a near-far area coupling numerical simulation method for thermal drainage and deep water discharge of a power plant. It is suitable for the simulation calculation method of the temperature rise diffusion range of nuclear power plant and thermal power plant warm water and deep water discharge. Background technique [0002] The rise of water temperature in local sea areas caused by thermal drainage is an important environmental problem faced by thermal and nuclear power plants. Dilution of warm drainage in receiving waters is divided into near-zone dilution and far-zone dilution processes. The two processes are very different in space and time scales. It is very difficult to use the same model to simulate both near and far zones. The method used in the past is to use model tests or empirical jet models in the near area to solve the problem of initial dilution in the near area. The model cannot accurately simulate the dilution an...

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Problems solved by technology

The method described aims at the research object of thermal power and nuclear power plant temperature and drainage near and far zone dilution and diffusion, establishes a three-dimensional mathematical model of temperature and drainage in the far zone and an empirical mathematical model in the near zone, and studies the near-zone jet dilution and distant The realization method of parameter transfer and dynamic coupling between zone flow-diffusion solves the problem that the warm drainage dilution diffusion model cannot simulate both the near zone and the far zone

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