Numerical simulation study of Glyd-ring seal in the seawater pump considering eccentricity

Purpose This paper aims to establish a mixed elastohydrodynamic lubrication model based on the seawater pump operating condition to study the reciprocating-seal performance of Glyd-ring under eccentricity. Design/methodology/approach The model introduces eccentricity and couples solid mechanics, fluid mechanics and contact mechanics. The model proposes a block-assisted installation method, addressing excessive deformation and interference issues in three-dimensional macroscopic solid mechanics analysis. Findings Simulation results show that both net leakage and friction force increase with the piston eccentricity distance. In the outstroke, the friction force is always lower than in the instroke. The presence of sealed pressure in the outstroke leads to an increase in net leakage. By connecting the leakage hole to the water tank, zero leakage can theoretically be achieved. Originality/value This study provides an analytical approach for the Glyd-ring seal performance under eccentric conditions and offers structural optimization ideas for the existing seawater pump.