Modeling experiment system and method for mixing characteristics of impact jet flow at core outlet of sodium-cooled fast reactor

Abstract

The invention discloses a modeling experiment system and method for mixing characteristics of impact jet flow at a core outlet of a sodium-cooled fast reactor. The experiment system comprises an experiment main loop, an experiment section, a secondary cooling loop and a data measurement system. The experiment main loop is mainly composed of a high-pressure plunger pump, a heat regenerator, a preheating section, an experiment section, a condenser, a water tank and other devices and pipe network accessories. The secondary cooling loop is mainly composed of a condenser, a circulating water pump, a cooling water tank, pipe network accessories and the like. The data measurement system mainly comprises a mass flow meter, a rapid reaction thermocouple and a particle image velocity measurement system. The geometric design of a jet flow outlet of the experiment section is based on the actual structure of the core outlet assembly head of the sodium-cooled fast reactor. The experiment system and method have the advantages of visual experimental process, high experimental precision, simple and feasible working condition switching and the like, and have important significance to research on the mixing characteristics of the impact jet flow at the core outlet of the sodium-cooled fast reactor.

Description

technical field [0001] The invention belongs to the technical field of sodium-cooled fast reactor cores, and in particular relates to a modeling experiment system and method for mixing characteristics of impact jets at the outlet of sodium-cooled fast reactor cores. Background technique [0002] The sodium-cooled fast reactor is one of the fastest-developed reactor types among the fourth-generation advanced reactors because of its inherent safety, multiplication of nuclear fuel, and transmutation of long-lived radioactive waste. The pool-type sodium-cooled fast reactor uses liquid metal sodium as the coolant. In the design, most of the equipment is placed in the pool. The core adopts a box-type design, which is a typical closed fuel assembly. Complex structures such as flow tubes, honeycomb positioning grids, and measurement probes. [0003] The complex core outlet structure leads to extremely complex flow state in the outlet area, and there is obvious impact jet mixing phe...

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Problems solved by technology

[0006]However, although there are many researches on the phenomenon of jet mixing at home and abroad, most of them focus on the impingement jet process of simple channels. For sodium-cooled fast reactors, the impingement The jet flow phenomenon is closely related to the design structure of the fast reactor core outlet and the operation characteristics of the whole reactor, and the study of the impingement jet flow phenomenon of a simple channel cannot meet the design requirements of the sodium-cooled fast reactor

In addition, the chemical properties of liquid metal sodium are active, flammable and explosive, and the impingement jet process under the complex structure of the fast reactor core outlet is very complicated. There are problems in measurement and control directly on the sodium circuit bench. At the same time, due to the extremely poor light transmission of liquid metal, visualization experiments cannot be carried out during the experiment, and it is difficult to visually reproduce the details of jet mixing.

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