Experimental facility and method for studying jet impact characteristics at core outlet of fast reactor

An experimental system for studying jet impact characteristics at an outlet of a fast reactor core, the experimental system comprising:

• a jet impact main loop of the experimental system, a cooling loop and a makeup water loop,
• wherein the jet impact main loop of the experimental system comprises:
• a jet impact chamber, a heat regenerator, a condenser, a water storage tank, a filter, a first regulating valve, a first plunger pump, three branch pipelines for connecting an inlet of the jet impact chamber with a tube-side outlet of the heat regenerator, a first pipeline for connecting an outlet of the jet impact chamber with a shell-side inlet of the heat regenerator, a second pipeline for connecting a shell-side outlet of the heat regenerator with a shell-side inlet of the condenser, a water return pipeline for connecting an inlet of the water storage tank with a shell-side outlet of the condenser, a fourth stop valve installed on the water return pipeline and configured for regulating a flow of deionized water returning into the water storage tank, a main pipeline for connecting an outlet of the water storage tank with a tube-side inlet of the heat regenerator, the filter, the first regulating valve and the first plunger pump are arranged on the main pipeline, wherein the jet impact chamber is configured to simulate the fast reactor core;
• wherein the cooling loop comprises the condenser, a cooling pump connected to the tube-side inlet of the condenser, a fifth regulating valve, a fourth flow meter connected to a tube-side outlet of the condenser, and a cooling tower;
• and
• wherein the makeup water loop comprises a tap water supply, a deionized water machine, a makeup water tank and a second plunger pump;
• a first stop valve, a first flow meter, a first preheater and a first thermometer sequentially installed on a first branch pipeline of the three branch pipelines which is configured for connecting the tube-side outlet of the heat regenerator and the inlet of the jet impact chamber, wherein the first stop valve is configured for regulating a flow of deionized water in the first branch pipeline, the first flow meter is configured for measuring the flow of the deionized water in the first branch pipeline, the first preheater is configured for heating the deionized water in the first branch pipeline, and the first thermometer is configured for measuring temperature of the deionized water in the first branch pipeline;
• a second stop valve, a second flow meter, a second preheater and a second thermometer sequentially installed on a second branch pipeline of the three branch pipelines which is configured for connecting the tube-side outlet of the heat regenerator and the inlet of the jet impact chamber, wherein the second stop valve is configured for regulating a flow of deionized water in the second branch pipeline, the second flow meter is configured for measuring the flow of the deionized water in the second branch pipeline, the second preheater is configured for heating the deionized water in the second branch pipeline, and the second thermometer is configured for measuring temperature of the deionized water in the second branch pipeline;
• a third stop valve, a third flow meter, a third preheater and a third thermometer sequentially installed on a third branch pipeline of the three branch pipelines which is configured for connecting the tube-side outlet of the heat regenerator and the inlet of the jet impact chamber, wherein the third stop valve is configured for regulating a flow of deionized water in the third branch pipeline, the third flow meter is configured for measuring the flow of the deionized water in the third branch pipeline, the third preheater is configured for heating the deionized water in the third branch pipeline, and the third thermometer is configured for measuring temperature of the deionized water in the third branch pipeline;
• wherein on the jet impact main loop, upstream and downstream branches of the heat regenerator are respectively connected with two ends of a second regulating valve via a third pipeline to form a first bypass loop, and the first bypass loop is configured to assist in regulating a flow of deionized water in the heat regenerator;
• wherein on the jet impact main loop, upstream and downstream branches of the condenser are respectively connected with two ends of a third regulating valve via a fourth pipeline to form a second bypass loop, and the second bypass loop is configured to assist in regulating a flow of deionized water in the condenser;
• wherein on the jet impact main loop, upstream and downstream branches of the water storage tank are respectively connected with two ends of a fourth regulating valve via a fifth pipeline to form a third bypass loop, and the third bypass loop is configured to assist in regulating a flow of deionized water in the jet impact main loop;
• a ball valve installed on an upstream pipeline of the water storage tank and configured to be a drain outlet, wherein the ball valve is configured for discharging an experimental working medium after an experiment is conducted for a period of time;
• and
• a signal processor connected with a data measurement system in the jet impact chamber, wherein the signal processor comprises a temperature measurement system and a particle image velocimetry system configured for collecting and processing experimental data;
• wherein the filter, the first regulating valve and the first plunger pump are sequentially connected from the outlet of the water storage tank to the tube-side inlet of the heat regenerator, and are arranged on the main pipeline;
• the filter is configured to filter fluid at an inlet of the first plunger pump, the first regulating valve is configured to regulate a flow of the fluid at the inlet of the plunger pump, and the first plunger pump is configured to drive the fluid to flow in the main pipeline;
• wherein a wall surface of the jet impact chamber is a cylindrical barrel, and the jet impact chamber comprises:
• a solid cylinder arranged in a center of a top section of the cylindrical barrel;
• a plurality of high-temperature strain gauges arranged into layers in a height direction of a wall surface of the solid cylinder and are uniformly arranged on each of the layers in a circumferential direction of the wall surface of the solid cylinder, and the plurality of high-temperature strain gauges are configured for measuring thermal impact of deionized water to the wall surface of the solid cylinder;
• a thermocouple arrangement frame arranged inside the jet impact chamber;
• a plurality of high-temperature-resistant thermocouples arranged into layers in a height direction of the thermocouple arrangement frame and are uniformly arranged on each of the layers in a circumferential direction and a radial direction of the thermocouple arrangement frame, and the plurality of high-temperature-resistant thermocouples are configured for measuring a temperature field in the jet impact chamber;
• three jet impact nozzles welded with a bottom portion of the jet impact chamber, extended into the jet impact chamber to a preset height, and connected with the tube-side outlet of the heat regenerator by the three branch pipelines.