Study on Fluid-Thermal-Solid Coupling of Damper of Sodium to Air Heat Exchanger in Sodium-Cooled Fast Reactor

Aiming at the problems of blade sticking and damper body strength failure of sodium to air heat exchanger in nuclear power sodium-cooled fast reactor under high temperature working environment, a double-blade damper for sodium to air heat exchanger of sodium-cooled fast reactor was designed. The characteristics of flow field, temperature distribution of damper body, deformation and stress of damper body with different opening degrees were studied using fluid-thermal-solid coupling method. The results show that when the opening of damper is below 45 degrees, the fluid will have obvious velocity gradient and pressure gradient before and after it passes through damper. The greater the local temperature difference, the greater the thermal stress value, and the maximum stress is 206.94 MPa, which appears at the edge of the frame side sealing plate, and the maximum stress value meets the material strength requirements. The deformation and stress of damper body are mainly thermal deformation and thermal stress caused by heating. The maximum deformation of damper is 3.3368 mm, and the deformation of the frame is greater than that of the blade in all directions. The newly designed damper has no phenomenon of blade sticking.