A dynamic model for elastic ring squeeze film damper considering fluid-structure interaction and fluid inertia

Elastic ring squeeze film damper (ERSFD) is an effective damping element for the aero-engine, but the existing literature lacks comprehensive research about the fluid-structure interaction (FSI) and fluid inertia on the behavior of ERSFD. This study investigates the FSI and inertia effects on the static and dynamic characteristics of ERSFD. The Reynolds equation for the ERSFD considering the fluid inertia and the elastic deformation equation for the elastic ring are established to analyze the dynamic and static characteristics of the ERSFD. The result indicates that the influence of fluid inertia on the dynamic and static characteristics of the ERSFD is more significant than that of the FSI effect; the inner oil film pressure is an order of magnitude larger than the outer oil film pressure, suggesting that the damping capacity of the ERSFD comes from the inner oil film rather than the outer oil film.