Numerical Simulation On The Hydraulic Characteristics Of The Lower Chamber Of The PWR

The research on the flow and heat transfer characteristics in the reactor is an importanttopic in the nuclear reactor safety. As an important part of the reactor, the chamber has thefunction to hold the coolant and to distribute the coolant flow of the reactor core. For thereactor core, the hydraulic characteristics determine its heat transfer performance. The reactorchamber which is connected with the reactor core plays an important role in the reactor core.Therefore the fluid flow of the lower chamber indirectly affects the heat transfer of the reactorcore. In the reactor structure design and thermal hydraulic design, calculation and analysis offlow field in the reactor chamber is a key subject.In order to research the hydraulic characteristics of the lower chamber, this paper willtake the numerical simulation software FLUENT as the tool, take the Qinshan Phase twopressurized water reactor power station as the research object, and calculate the lowerchamber. In the calculation of the lower chamber, we establish the model and then dividemesh of it. Three turbulence models such as the standard k-ε model, Realizable K-ε modeland S k–ω model were used. Through the calculation of the lower chamber, finally we got thedistribution of the pressure field and flow field using three different turbulence models, andthe results of the three different turbulence models were compared.The results show that the flow field and pressure field distribution tendency isunanimous. The velocity distribution in the outlet of lower chamber follows a rule that isdeclining from the center to the edge. The maximum pressure in the lower chamber mainlyappears in the two supporting blocks and the wall near them.The present studies are of great significance and can provide valuable references for thedesign, optimization and operation management of the power stations.