Aiming at the flow-accelerated corrosion (FAC) problem in feed water system and drain system of supercritical boilers

a combination of experimental data and numerical simulation was used to analyze the corrosion of the 90° elbow. In the experiment

the FAC rate of elbows at different inlet velocities was measured by electrochemical method

and the experimental data were analyzed; the flow field of elbows at different inlet velocities was calculated by using numerical simulation methods; finally

based on the M.I.T model

the FAC model of the 90° elbow is simplified at room temperature

and the field synergy principle was used to analyze the characteristics and influencing factors of the FAC distribution at different positions of the elbow from the perspective of fluid dynamics. The analysis shows that along the flow direction

the higher the mass coefficient is

the higher the cross-section is; the greater the radial velocity of the center

the greater the rate of the bend FAC.